https://scholars.lib.ntu.edu.tw/handle/123456789/347784
Title: | Spectra broadening of point-contact Andreev reflection measurement on GaMnAs | Authors: | Chiang, T.W. Chiu, Y.H. SSU-YEN HUANG Lee, S.F. Liang, J.J. Jaffr?s, H. George, J.M. Lemaitre, A. |
Issue Date: | 2009 | Journal Volume: | 105 | Journal Issue: | 7 | Source: | Journal of Applied Physics | Abstract: | Point-contact Andreev reflection measurements on Ga0.94 Mn0.06 As were investigated using Pb tips. The observed conductance versus voltage spectra exhibited behaviors which were described by the modified Blonder-Tinkham- Klapwijk model but with significant broadening. We propose a model by introducing a spreading resistance and compare with an existing model which included effective temperature as a parameter. In as-grown/annealed Ga0.94 Mn0.06 As samples, we extracted conduction electron spin polarization of 76%/74% from our model, instead of 90%/82% from the one with the effective temperature. © 2009 American Institute of Physics. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-65249148698&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/347784 |
ISSN: | 00218979 | DOI: | 10.1063/1.3059605 | SDG/Keyword: | Andreev reflections; Conduction electrons; Effective temperatures; Spreading resistances; Extraction; Lead; Spin dynamics; Point contacts |
Appears in Collections: | 應用物理研究所 |
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