Spectra broadening of point-contact Andreev reflection measurement on GaMnAs

被引：9

作者：

Chiang, T. W. ^{[1
,2
]}

Chiu, Y. H. ^{[1
]}

Huang, S. Y. ^{[1
]}

Lee, S. F. ^{[1
]}

Liang, J. J. ^{[3
]}

Jaffres, H. ^{[4
,5
]}

George, J. M. ^{[4
,5
]}

Lemaitre, A. ^{[6
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 115, Taiwan

[2] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[3] Fu Jen Catholic Univ, Dept Phys, Taipei 242, Taiwan

[4] Univ Paris 11, F-91405 Orsay, France

[5] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France

[6] CNRS, Lab Photon & Nanostruct, F-91460 Marcoussis, France

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 07期

关键词：

TRANSPORT;

D O I：

10.1063/1.3059605

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Point-contact Andreev reflection measurements on Ga0.94Mn0.06As 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 Ga0.94Mn0.06As samples, we extracted conduction electron spin polarization of 76%/74% from our model, instead of 90%/82% from the one with the effective temperature. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3059605]

引用

页数：3

共 16 条

[1]

[Anonymous], 2004, LOW LEV MEAS HDB

[2] Spin polarization of magnetoresistive materials by point contact spectroscopy [J].

Auth, N ;

Jakob, G ;

Block, T ;

Felser, C .

PHYSICAL REVIEW B, 2003, 68 (02)

[3] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[4] Direct measurement of the spin polarization of the magnetic semiconductor (Ga,Mn)As [J].

Braden, JG ;

Parker, JS ;

Xiong, P ;

Chun, SH ;

Samarth, N .

PHYSICAL REVIEW LETTERS, 2003, 91 (05) :566021-566024

[5] Andreev reflection measurements of spin polarization [J].

Chalsani, P. ;

Upadhyay, S. K. ;

Ozatay, O. ;

Buhrman, R. A. .

PHYSICAL REVIEW B, 2007, 75 (09)

[6] Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection [J].

Huang, S. X. ;

Chen, T. Y. ;

Chien, C. L. .

APPLIED PHYSICS LETTERS, 2008, 92 (24)

[7] Inelastic scattering and spin polarization in dilute magnetic semiconductor (Ga,Mn)Sb [J].

Panguluri, Raghava P. ;

Nadgorny, B. ;

Wojtowicz, T. ;

Liu, X. ;

Furdyna, J. K. .

APPLIED PHYSICS LETTERS, 2007, 91 (25)

[8] Andreev reflection and pair-breaking effects at the superconductor/magnetic semiconductor interface [J].

Panguluri, RP ;

Ku, KC ;

Wojtowicz, T ;

Liu, X ;

Furdyna, JK ;

Lyanda-Geller, YB ;

Samarth, N ;

Nadgorny, B .

PHYSICAL REVIEW B, 2005, 72 (05)

[9] FINITE-QUASI-PARTICLE-LIFETIME EFFECTS IN THE DIFFERENTIAL CONDUCTANCE OF BI2SR2CACU2OY/AU JUNCTIONS [J].

PLECENIK, A ;

GRAJCAR, M ;

BENACKA, S ;

SEIDEL, P ;

PFUCH, A .

PHYSICAL REVIEW B, 1994, 49 (14) :10016-10018

[10] Measuring the spin polarization of a metal with a superconducting point contact [J].

Soulen, RJ ;

Byers, JM ;

Osofsky, MS ;

Nadgorny, B ;

Ambrose, T ;

Cheng, SF ;

Broussard, PR ;

Tanaka, CT ;

Nowak, J ;

Moodera, JS ;

Barry, A ;

Coey, JMD .

SCIENCE, 1998, 282 (5386) :85-88

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