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    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/63547


    Title: Effect of transport-induced charge inhomogeneity on point-contact Andreev reflection spectra at ferromagnet-superconductor interfaces
    Authors: 郭光宇
    Hsu, Ya-Fen;Chiang, Tien-Wei;Guo, Guang-Yu;Lee, Shang-Fan;Liang, Jun-Jih
    Contributors: 應物所
    Keywords: Andreev reflection;point contact;spin-polarization;ferromagnet;superconductor
    Date: 2012.07
    Issue Date: 2014-01-24 12:53:58 (UTC+8)
    Abstract: We investigate the transport properties of a ferromagnet–superconductor interface within the framework of a modified three-dimensional Blonder–Tinkham–Klapwijk formalism. In particular, we propose that charge inhomogeneity forms via two unique transport mechanisms, namely, evanescent Andreev reflection and evanescent quasiparticle transmission. Furthermore, we take into account the influence of charge inhomogeneity on the interfacial barrier potential and calculate the conductance as a function of bias voltage. Point-contact Andreev reflection (PCAR) spectra often show dip structures, large zero-bias conductance enhancement, and additional zero-bias conductance peak. Our results indicate that transport-induced charge inhomogeneity could be a source of all these anomalous characteristics of the PCAR spectra. ©2012 The Physical Society of Japan
    Relation: Journal of the Physical Society of Japan, 81, 084704
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1143/JPSJ.81.084704
    DOI: 10.1143/JPSJ.81.084704
    Appears in Collections:[應用物理研究所 ] 期刊論文

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