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Title: Interfacial effects revealed by ultrafast relaxation dynamics in BiFeO3/YBa2Cu3O7 bilayers
Authors: Springer, Daniel
Nair, Saritha K.
He, Mi
Lu, Cheng Liang
Cheong, Siew Ann
Wu, Tom
Panagopoulos, Christos
Chia, Elbert E. M.
Zhu, Jian-Xin
Keywords: DRNTU::Science::Physics
Interfacial Layer
Issue Date: 2016
Source: Springer, D., Nair, S. K., He, M., Lu, C. L., Cheong, S. A., Wu, T., . . . Zhu, J. X. (2016). Interfacial effects revealed by ultrafast relaxation dynamics in BiFeO 3/YBa2Cu3O7 bilayers. Physical Review B, 93(6), 064510-. doi:10.1103/PhysRevB.93.064510
Series/Report no.: Physical Review B
Abstract: The temperature dependence of the relaxation dynamics in the bilayer thin film heterostructure composed of multiferroic BiFeO3 (BFO) and superconducting YBa2Cu3O7 (YBCO) grown on a (001) SrTiO3 substrate is studied by a time-resolved pump-probe technique, and compared with that of pure YBCO thin film grown under the same growth conditions. The superconductivity of YBCO is found to be retained in the heterostructure. We observe a speeding up of the YBCO recombination dynamics in the superconducting state of the heterostructure, and attribute it to the presence of weak ferromagnetism at the BFO/YBCO interface as observed in magnetization data. An extension of the Rothwarf-Taylor model is used to fit the ultrafast dynamics of BFO/YBCO, that models an increased quasiparticle occupation of the ferromagnetic interfacial layer in the superconducting state of YBCO.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.93.064510
Rights: © 2016 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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