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American Institute of Physics, Applied Physics Letters, 25(97), p. 252905

DOI: 10.1063/1.3530446

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Superconducting gap induced barrier enhancement in a BiFeO3-based heterostructure

Journal article published in 2010 by C. L. Xing Guozhong.; Xing Guichuan.; Li Mingjie.; Sie Edbert Jarvis.; Wang Dandan.; Sulistio Arief.; Ye Quan Lin.; Huan Alfred Cheng Hon.; Wu Tom.; Sum Tze Chien Lu, Y. Wang, L. You, X. Zhou, Haiyang Y. Peng, Guozhong Z. Xing, Elbert E. M. Chia ORCID, Christos Panagopoulos, L. Chen, J.-M. Liu, J. Wang ORCID, Tom Wu
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This paper is available in a repository.

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Abstract

We report the synthesis and characterization of an epitaxial heterostructure composed of multiferroic BiFeO3 and superconducting YBa2Cu3O7−δ thin films grown on (001) SrTiO3. Both the superconductivity of YBa2Cu3O7−δ and the erroelectricity of BiFeO3 are retained in the heterostructure. Current density-electric field characteristics measured from 30 to 170 K suggest a Schottky-emission-like transport at the BiFeO3 /YBa2Cu3O7−δ interface. Furthermore, the temperature dependence of the barrier height shows an anomalous enhancement at TC, indicating an intimate coupling between the multiferroic and the superconducting layers.