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Elsevier, Journal of Magnetism and Magnetic Materials, 2(310), p. 1357-1359, 2007

DOI: 10.1016/j.jmmm.2006.10.378

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Impurity- and field-induced magnetic orderings in doped quantum antiferromagnet

Journal article published in 2007 by M. Fujisawa, T. Ono, H. Fujiwara, H. Tanaka, V. Sikolenko ORCID, M. Meissner, P. Smeibidl, S. Gerischer, H. A. Graf
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

TlCuCl3 is a spin-12 magnetic insulator with a spin gap Δ/2μB=5.5T. Its magnetic properties are described by a three-dimensionally coupled spin dimer model. Tl(Cu1-xMgx)Cl3 doped with nonmagnetic Mg2+ undergoes impurity-induced magnetic ordering. Because a finite gap for triplet excitations still remains, this doped system can also undergo magnetic-field-induced magnetic ordering. In order to investigate the phase diagram of TlCu1-xMgxCl3 with x∼0.01, we performed specific heat measurements and neutron scattering experiments in a magnetic field. It was found that impurity- and field-induced ordered phases are the same, and that the gapped spin liquid state observed in pure TlCuCl3 is completely wiped out by such a weak doping.