Superconducting gap induced barrier enhancement in a BiFeO3-based heterostructure
Lu, 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.
Chia, Elbert E. M.
Liu, J. M.
Date of Issue2010
School of Materials Science and Engineering
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.
Applied physics letters
© 2010 American Institute of Physics. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following DOI: http://dx.doi.org/10.1063/1.3530446. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.