@article{Cao2013, abstract = {We report the successful synthesis of single-crystals of the layered iridate, (Na$_{1-x}$Li$_{x}$)$_2$IrO$_3$, $0≤ x ≤ 0.9$, and a thorough study of its structural, magnetic, thermal and transport properties. The new compound allows a controlled interpolation between Na$_2$IrO$_3$ and Li$_2$IrO$_3$, while maintaing the novel quantum magnetism of the honeycomb Ir$^{4+}$ planes. The measured phase diagram demonstrates a dramatic suppression of the Néel temperature, $T_N$, at intermediate $x$ suggesting that the magnetic order in Na$_2$IrO$_3$ and Li$_2$IrO$_3$ are distinct, and that at $x≈ 0.7$, the compound is close to a magnetically disordered phase that has been sought after in Na$_2$IrO$_3$ and Li$_2$IrO$_3$. By analyzing our magnetic data with a simple theoretical model we also show that the trigonal splitting, on the Ir$^{4+}$ ions changes sign from Na$_2$IrO$_3$ and Li$_2$IrO$_3$, and the honeycomb iridates are in the strong spin-orbit coupling regime, controlled by $\jeff=1/2$ moments. ; Comment: updated version with more data}, author = {Cao, G. and Qi, T. F. and Li, L. and Terzic, J. and Cao, V. S. and Yuan, S. J. and Tovar, M. and Murthy, G. and Kaul, R. K.}, doi = {10.1103/physrevb.88.220414}, journal = {Physical review B}, month = {dec}, title = {Evolution of magnetism in the single-crystal honeycomb iridates(Na1−xLix)2IrO3}, url = {http://arxiv.org/abs/1307.2212}, volume = {88}, year = {2013} } @article{Cao2014, abstract = {We synthesize and study single crystals of a new double-perovskite Sr2YIrO6. Despite two strongly unfavorable conditions for magnetic order, namely, pentavalent Ir5+(5d4) ions which are anticipated to have Jeff=0 singlet ground states in the strong spin-orbit coupling (SOC) limit and geometric frustration in a face-centered cubic structure formed by the Ir5+ ions, we observe this iridate to undergo a novel magnetic transition at temperatures below 1.3 K. We provide compelling experimental and theoretical evidence that the origin of magnetism is in an unusual interplay between strong noncubic crystal fields, local exchange interactions, and "intermediate-strength" SOC. Sr2YIrO6 provides a rare example of the failed dominance of SOC in the iridates.}, author = {Cao, G. and Qi, T. F. F. and Li, L. and Terzic, J. and Yuan, S. J. J. and DeLong, L. E. E. and Murthy, G. and Kaul, R. K. K.}, doi = {10.1103/physrevlett.112.056402}, journal = {Physical Review Letters}, month = {feb}, title = {Novel Magnetism ofIr5+(5d4)Ions in the Double PerovskiteSr2YIrO6}, url = {https://www.researchgate.net/profile/Tongfei_Qi/publication/260442351_Novel_Magnetism_of_Ir55d4_ions_in_the_Double_Perovskite_Sr2YIrO6/links/00b49531908ae55adb000000.pdf}, volume = {112}, year = {2014} } @article{Foroozani2013, author = {Foroozani, N. and Lim, J. and Li, L. and Cao, G. and Schilling, J. S.}, doi = {10.1016/j.physleta.2013.09.041}, journal = {Physics Letters A}, month = {dec}, pages = {3184-3186}, title = {Dependence of temperature-dependent electrical resistivity of SrIrO3 on hydrostatic pressure to 9.1 kbar}, url = {https://www.researchgate.net/profile/Jinhyuk_Lim2/publication/260701161_Dependence_of_temperature-dependent_electrical_resistivity_of_SrIrO3_on_hydrostatic_pressure_to_91_kbar/links/55ae95a208aed614b09a7450.pdf}, volume = {377}, year = {2013} } @article{Li2013, abstract = {We observe an unusual combination of normal and superconducting state properties without any signature of strong spin fluctuations in single-crystal Ir3Te8. The electrical resistivity does not saturate by 700 K but exhibits a low-resistivity ratio, and it exhibits two extended linear regimes (approximately 20–330 and 370–700 K) with the same slope, separated by a small hysteretic interval marking a strong first-order phase transition from cubic to rhombohedral lattice symmetry at TS = 350 K. The electronic heat-capacity coefficient (11 mJ mol−1 K−2) is consistent with a net diamagnetic, rather than a Pauli paramagnetic, normal state that yields to superconductivity below a critical temperature TC = 1.8 K. The size of the heat-capacity jump near TC indicates bulk superconductivity.}, author = {Li, L. and Qi, T. F. and Lin, L. S. and Wu, X. X. and Zhang, X. T. and Butrouna, K. and Cao, V. S. and Zhang, Y. H. and Hu, Jiangping and Yuan, S. J. and Schlottmann, P. and De Long, L. E. and Cao, G.}, doi = {10.1103/physrevb.87.174510}, journal = {Physical review B}, month = {may}, title = {Observation of superconductivity and anomalous electrical resistivity in single-crystal Ir3Te8}, url = {https://link.aps.org/accepted/10.1103/PhysRevB.87.174510}, volume = {87}, year = {2013} } @article{Li2013_2, author = {Li, L. and Kong, P. P. and Qi, T. F. and Jin, C. Q. and Yuan, S. J. and DeLong, L. E. and Schlottmann, P. and Cao, G.}, doi = {10.1103/physrevb.87.235127}, journal = {Physical review B}, month = {jun}, title = {Tuning theJeff=12insulating state via electron doping and pressure in the double-layered iridate Sr3Ir2O7}, url = {https://link.aps.org/accepted/10.1103/PhysRevB.87.235127}, volume = {87}, year = {2013} } @article{Liu2015, abstract = {High-quality epitaxial growth of inter-metallic MnPt films on oxides is achieved, with potential for multiferroic heterostructure applications. Antisite-stabilized spin-flipping induces ferromagnetism in MnPt films, although it is robustly antiferromagnetic in bulk. Moreover, highly ordered antiferromagnetic MnPt films exhibit superiorly large exchange coupling with a ferromagnetic layer.}, author = {Liu, Zhiqi and Biegalski, Michael D. and Hsu, Shang-Lin and Shang, Shunli and Marker, Cassie and Liu, Jian and Li, Li and Fan, Lisha and Meyer, Tricia L. and Wong, Anthony T. and Nichols, John A. and Chen, Deyang and You, Long and Chen, Zuhuang and Wang, Kai and Wang, Kevin and Ward, Thomas Z. and Gai, Zheng and Lee, Ho Nyung and Sefat, Athena S. and Lauter, Valeria and Liu, Zi-Kui and Christen, Hans M.}, doi = {10.1002/adma.201502606}, journal = {Advanced Materials}, month = {nov}, pages = {118-123}, title = {Epitaxial Growth of Intermetallic MnPt Films on Oxides and Large Exchange Bias}, url = {https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fadma.201502606}, volume = {28}, year = {2015} } @article{Liu2016, author = {Liu, Zhiqi and Biegalski, Michael D. and Hsu, Shang-Lin and Shang, Shunli and Marker, Cassie and Liu, Jian and Li, Li and Fan, Lisha and Meyer, Tricia L. and Wong, Anthony T. and Nichols, John A. and Chen, Deyang and You, Long and Chen, Zuhuang and Wang, Kai and Wang, Kevin and Ward, Thomas Z. and Gai, Zheng and Lee, Ho Nyung and Sefat, Athena S. and Lauter, Valeria and Liu, Zi-Kui and Christen, Hans M.}, doi = {10.1002/adma.201670007}, journal = {Advanced Materials}, month = {jan}, pages = {204-204}, title = {Ferromagnetism: Epitaxial Growth of Intermetallic MnPt Films on Oxides and Large Exchange Bias (Adv. Mater. 1/2016)}, url = {http://onlinelibrary.wiley.com/doi/10.1002/adma.201670007/pdf}, volume = {28}, year = {2016} } @article{Liu2016_2, abstract = {We report a giant, ~22%, electroresistance modulation for a metallic alloy above room temperature. It is achieved by a small electric field of 2 kV/cm via piezoelectric strain-mediated magnetoelectric coupling and the resulting magnetic phase transition in epitaxial FeRh/BaTiO3 heterostructures. This work presents detailed experimental evidence for an isothermal magnetic phase transition driven by tetragonality modulation in FeRh thin films, which is in contrast to the large volume expansion in the conventional temperature-driven magnetic phase transition in FeRh. Moreover, all the experimental results in this work illustrate FeRh as a mixed-phase model system well similar to phase-separated colossal magnetoresistance systems with phase instability therein. ; Comment: 6 pages, 3 figures}, author = {Liu, Z. Q. Q. and Li, L. and Gai, Z. and Clarkson, J. D. D. and Hsu, S. L. L. and Wong, A. T. T. and Fan, L. S. S. and Lin, M.-W. and Rouleau, C. M. M. and Ward, T. Z. Z. and Lee, H. N. N. and Sefat, A. S. S. and Christen, H. M. M. and Ramesh, R.}, doi = {10.1103/physrevlett.116.097203}, journal = {Physical Review Letters}, month = {mar}, title = {Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy}, url = {https://link.aps.org/accepted/10.1103/PhysRevLett.116.097203}, volume = {116}, year = {2016} } @article{Sefat2015, abstract = {AbstractWithin the BaFe2As2 crystal lattice, we partially substitute thallium for barium and report the effects of interlayer coupling in Ba1-xTlxFe2As2 crystals. We demonstrate the unusual effects of magneto-elastic coupling and charge doping in this iron-arsenide material, whereby Néel temperature rises with small x, and then falls with additional x. Specifically, we find that Néel and structural transitions in BaFe2As2 (TN = Ts = 133 K) increase for x = 0.05 (TN = 138 K, Ts = 140 K) from magnetization, heat capacity, resistivity, and neutron diffraction measurements. Evidence from single crystal X-ray diffraction and first principles calculations attributes the stronger magnetism in x = 0.05 to magneto-elastic coupling related to the shorter intraplanar Fe-Fe bond distance. With further thallium substitution, the transition temperatures decrease for x = 0.09 (TN = Ts = 131 K), and this is due to charge doping. We illustrate that small changes related to 3d transition-metal state can have profound effects on magnetism.}, author = {Sefat, Athena S. and Li, Li and Cao, Huibo B. and McGuire, Michael A. and Sales, Brian and Custelcean, Radu and Parker, David S.}, doi = {10.1038/srep21660}, journal = {Scientific Reports}, month = {nov}, title = {Anomalous magneto-elastic and charge doping effects in thallium-doped BaFe2As2}, url = {http://dx.doi.org/10.1038/srep21660}, volume = {6}, year = {2015} } @article{Wang2015, abstract = {We investigated the doping effects of Sb on the magnetic, transport and structural properties in FeTe1−xSbx single crystals. Resistivity, magnetic susceptibility and heat capacity experiments consistently reveal that the magnetic/structural transition temperature in undoped Fe1.05Te is gradually suppressed by Sb doping, but no superconductivity is observed for x up to 10%. It is found that the electronic heat capacity coefficient increases with Sb content, implying the increase of the density of states at Fermi level. Referring to previous calculation reports, this means that the Sb substituent plays a role of hole carrier doping, which is consistent with our measurements on Hall coefficient. Structural analysis shows that Sb doping induces an expansion of the lattice along the a axis and a shrinkage along the c axis. Our work suggests that the antiferromagnetism in Fe1+yTe may be different in nature with other parent compounds of FeAs-based systems.}, author = {Wang, X. F. and Zhang, Z. T. and Chen, X. L. and Kan, X. C. and Li, L. and Sun, Y. P. and Zhang, L. and Xi, C. Y. and Pi, L. and Yang, Z. R. and Zhang, Y. H.}, doi = {10.1016/j.physc.2015.03.017}, journal = {Physica C: Superconductivity and its Applications}, month = {jun}, pages = {39-42}, title = {Doping effects of Sb in FeTe1−xSbx single crystals}, url = {https://www.researchgate.net/profile/Li_Li268/publication/275218968_Doping_effects_of_Sb_in_FeTe1-xSbx_single_crystals/links/553f849e0cf24c6a05d22e68.pdf}, volume = {513}, year = {2015} } @article{Xie2012, abstract = {The correlation between colossal magnetocapacitance (CMC) and colossal magnetoresistance (CMR) in CdCr 2 S 4 system has been revealed. The CMC is induced in polycrystalline Cd 0.97 In 0.03 Cr 2 S 4 by annealing in cadmium vapor. At the same time, an insulator-metal transition and a concomitant CMR are observed near the Curie temperature. In contrast, after the same annealing treatment, CdCr 2 S 4 displays a typical semiconductor behavior and does not show magnetic field dependent dielectric and electric transport properties. The simultaneous occurrence or absence of CMC and CMR effects implies that the CMC in the annealed Cd 0.97 In 0.03 Cr 2 S 4 could be explained qualitatively by a combination of CMR and Maxwell-Wagner effect. a) Corresponding author.}, author = {Xie, Y. M. and Yang, Z. R. and Li, L. and Yin, L. H. and Hu, X. B. and Huang, Y. L. and Jian, H. B. and Song, W. H. and Sun, Y. P. and Zhou, S. Q. and Zhang, Y. H.}, doi = {10.1063/1.4770486}, journal = {Journal of Applied Physics}, month = {dec}, pages = {123912}, title = {Annealing induced colossal magnetocapacitance and colossal magnetoresistance in In-doped CdCr2S4}, url = {http://arxiv.org/abs/1212.6633}, volume = {112}, year = {2012} } @article{Xie2013, abstract = {In this paper, magnetic field and hydrostatic pressure effects on magnetism of ZnCr2S4 were investigated. Upon cooling the sample at 0.5 T to 2 K then warming back, the magnetization displays irreversibility between the cooling and warming sequence at temperatures around incommensurate–commensurate antiferromagnetic transition TN2. With increasing magnetic field or hydrostatic pressure, the irreversibility is gradually suppressed, although the thermal hysteresis is shifted to higher temperatures under pressure. The observed thermal hysteresis is attributed to a structural transition and evolution of different magnetic phases upon cooling and warming.}, author = {Xie, Y. M. and Yang, Z. R. and Zhang, Z. T. and Shen, C. and Li, L. and Ling, L. S. and Pi, L. and Sun, Y. P. and Zhang, Y. H.}, doi = {10.1016/j.jmmm.2013.03.010}, journal = {Journal of Magnetism and Magnetic Materials}, month = {aug}, pages = {81-83}, title = {Magnetic field and pressure effects on magnetism of bond-frustrated ZnCr2S4}, url = {https://www.researchgate.net/profile/Li_Li268/publication/257152654_Magnetic_field_and_pressure_effects_on_magnetism_of_bond-frustrated_ZnCr2S4/links/54ee22840cf2e55866f2199c.pdf}, volume = {339}, year = {2013} } @article{Yuan2013, abstract = {We present a study of exchange bias generated at the interface between a polycrystalline Co film sputtered on a cleavage plane of single-crystal Ca2Ru0.98Fe0.02FeO4. The exchange bias is accompanied by an extremely large vertical magnetization shift that is characterized by 60% of the saturation magnetization in a 70-kOe cooling field. This phenomenon is seldom observed in other heterostructures. The effects of cooling-field amplitude and temperature on the exchange bias indicate that the magnetization shift results from a ferromagnetic contribution of canted moments in Ca2Ru0.98Fe0.02O4. A Type-I training effect is also observed, in which the hysteresis loop shrinks from both sides with cycling of the applied field.}, author = {Yuan, S. J. and Li, L. and Qi, T. F. and DeLong, L. E. and Cao, G.}, doi = {10.1103/physrevb.88.024413}, journal = {Physical review B}, month = {jul}, title = {Giant vertical magnetization shift induced by spin canting in a Co/Ca2Ru0.98Fe0.02FeO4heterostructure}, url = {https://link.aps.org/accepted/10.1103/PhysRevB.88.024413}, volume = {88}, year = {2013} } @article{Yuan2013_2, abstract = {We report the successful synthesis of single-phase polycrystalline CeFeO3, and a thorough study of its magnetic and thermal properties. An abrupt spin reorientation transition occurs at T = 240 K, indicating a first-order phase transition from Γ4 (Gx, Ay, Fz) to Γ1 (Ax, Gy, Cz). A distinct thermal anomaly in the specific heat due to spin reorientation has been detected, with the onset and completion of the spin reorientation at 240 K and 220 K, respectively. The low-temperature specific heat exhibits a Schottky anomaly caused by paramagnetic Ce3+. The very-low-temperature specific heat increases with increasing the applied magnetic field, suggesting an antiferromagnetic transition of Ce3+ exists below T = 1.8 K.}, author = {Yuan, S. J. and Cao, Y. M. and Li, L. and Qi, T. F. and Cao, S. X. and Zhang, J. C. and DeLong, L. E. and Cao, G.}, doi = {10.1063/1.4821516}, journal = {Journal of Applied Physics}, month = {sep}, pages = {113909}, title = {First-order spin reorientation transition and specific-heat anomaly in CeFeO3}, url = {https://www.researchgate.net/profile/Yiming_Cao2/publication/260552005_First-order_spin_reorientation_transition_and_specific-heat_anomaly_in_CeFeO3/links/541138af0cf2f2b29a412277.pdf}, volume = {114}, year = {2013} } @article{Yuan2015, author = {Yuan, S. J. and Terzic, J. and Wang, J. C. and Li, L. and Aswartham, S. and Song, W. H. and Ye, F. and Cao, G.}, doi = {10.1103/physrevb.92.024425}, journal = {Physical review B}, month = {jul}, title = { Evolution of magnetism in single-crystal C a 2 R u 1 − x I r x O 4 ( 0 ≤ x ≤ 0.65 ) }, url = {https://link.aps.org/accepted/10.1103/PhysRevB.92.024425}, volume = {92}, year = {2015} } @article{Zhang2013, abstract = {The annealing effects on superconductivity in Rb0.81Fe1.72Se2 are investigated. For as-grown single crystal and the one annealed with furnace cooling, magnetic susceptibility exhibits a weak diamagnetic transition at 30 K. Consistently, the resistivity curve only displays a small drop at 30 K and an insulating behavior at lower temperatures. These features together with scanning electron microscope (SEM) data indicate that the superconducting phase exists as clusters in insulating matrix. As for the crystal annealed with fast quenching, resistivity results reveal a Tconset ≈ 30 K and a Tczero ≈ 10 K but the susceptibility does not show diamagnetic transition until the temperature is cooled down to 10 K. SEM results show that the surface of quenched sample is more homogeneous than the one annealed with furnace cooling. We argue that the annealing at high temperature makes the coexistence of superconducting and insulating phases becomes homogeneous. Then, the fast quenching preserves this state in which percolative superconducting paths could be easily formed. In comparison, during the furnace cooling, the temperature drops slowly and results in the segregation of the superconducting phase from the insulating phase into isolated clusters.}, author = {Zhang, Z. T. and Yang, Z. R. and Li, L. and Sun, Y. P. and Du, H. F. and Yang, J. Y. and Pi, L. and Zhang, C. J. and Tian, M. L. and Zhang, Y. H.}, doi = {10.1063/1.4795865}, journal = {Journal of Applied Physics}, month = {mar}, pages = {17E128}, title = {Annealing effects on superconductivity in Rb0.81Fe1.72Se2 single crystal}, url = {https://www.researchgate.net/profile/Li_Li268/publication/257974345_Annealing_effects_on_superconductivity_in_Rb081Fe172Se2_single_crystal/links/54ee2e490cf25238f939cc85.pdf}, volume = {113}, year = {2013} } @article{Zhang2013_2, author = {Zhang, Z. T. and Yang, Z. R. and Lu, W. J. and Chen, X. L. and Li, L. and Sun, Y. P. and Xi, C. Y. and Ling, L. S. and Zhang, C. J. and Pi, L. and Tian, M. L. and Zhang, Y. H.}, doi = {10.1103/physrevb.88.214511}, journal = {Physical review B}, month = {dec}, title = {Superconductivity in Fe1.05Te:Oxsingle crystals}, url = {https://www.researchgate.net/profile/Xuliang_Chen/publication/259716587_Superconductivity_in_Fe105TeOx_single_crystal/links/0f31752d76c173bd12000000.pdf}, volume = {88}, year = {2013} } @article{Zhao2014, abstract = {We conducted in situ angle dispersive high pressure x-ray diffraction experiments on Sr 3 Ir 2 O 7 up to 23.1 GPa at 25 K with neon as the pressure transmitting medium. Pressure induces a highly anisotropic compressional behavior seen where the tetragonal plane is compressed much faster than the perpendicular direction. By analyzing different aspects of the diffraction data, a second-order structural transition is observed at approximately 14 GPa, which is accompanied by the insulating state to nearly metallic state at 13.2 GPa observed previously (Li et al 2013 Phys. Rev. B 87 235127). Our results highlight the coupling between electronic state and lattice structure in Sr 3 Ir 2 O 7 under pressure.}, author = {Zhao, Z. and Wang, S. and Qi, T. F. and Zeng, Q. and Hirai, S. and Kong, P. P. and Li, L. and Park, C. and Yuan, S. J. and Jin, C. Q. and Cao, G. and Mao, W. L.}, doi = {10.1088/0953-8984/26/21/215402}, journal = {Journal of Physics: Condensed Matter}, month = {may}, pages = {215402}, title = {Pressure induced second-order structural transition in Sr3Ir2O7}, url = {https://www.researchgate.net/profile/Shigeto_Hirai/publication/262146145_Pressure_induced_second-order_structural_transition_in_Sr3Ir2O7/links/543cd8c00cf24ef33b76432f.pdf}, volume = {26}, year = {2014} } @article{Zhu2013, author = {Zhu, Xiangde and Lu, Wenjian and Ning, Wei and Qu, Zhe and Li, Li and Qi, T. F. and Cao, Gang and Petrovic, Cedomir and Zhang, Yuheng}, doi = {10.1016/j.jallcom.2013.06.127}, journal = {Journal of Alloys and Compounds}, month = {jan}, pages = {543-546}, title = {Single crystal growth, transport, and electronic band structure of YCoGa5}, url = {http://arxiv.org/pdf/1307.3643.pdf}, volume = {578}, year = {2013} } @article{Zhu2016, author = {Zhu, Yanglin and Li, Li and Yang, Zhaorong and Zhang, Zhitao and Yuan, Bin and Chen, Jun and Du, Haifeng and Sun, Yuping and Zhang, Yuheng}, doi = {10.1016/j.jmmm.2015.08.067}, journal = {Journal of Magnetism and Magnetic Materials}, month = {jan}, pages = {1-5}, title = {CO-doping effects on the transport and magnetic properties of FeTe}, url = {https://oadoi.org/10.1016/j.jmmm.2015.08.067}, volume = {397}, year = {2016} }