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28 March 2024 |
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Andreev Reflection and Pair Breaking Effects at the Superconductor/Magnetic Semiconductor Interface | R.P. Panguluri
; K.C. Ku
; T. Wojtowicz
; X. Liu
; J.K. Furdyna
; Y.B. Lyanda-Geller
; N. Samarth
; B. Nadgorny
; | Date: |
22 Feb 2005 | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | Abstract: | We investigate the applicability of spin polarization measurements using Andreev reflection in a point contact geometry in heavily doped dilute magnetic semiconductors, such as (Ga,Mn)As. While we observe conventional Andreev reflection in non-magnetic (Ga,Be)As epilayers, our measurements indicate that in ferromagnetic (Ga,Mn)As epilayers with comparable hole concentration the conductance spectra can only be adequately described by a broadened density of states and a reduced superconducting gap. We suggest that these pair-breaking effects stem from inelastic scattering in the metallic impurity band of (Ga,Mn)As and can be explained by introducing a finite quasiparticle lifetime or a higher effective temperature. For (Ga,Mn)As with 8% Mn concentration and 140 K Curie temperature we evaluate the spin polarization to be 83+/-17%. PACS numbers: 72.25.Dc,72.25.Mk,74.45.+c | Source: | arXiv, cond-mat/0502536 | Services: | Forum | Review | PDF | Favorites |
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