Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-02-22
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevB.72.054510
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
Furdyna Jacek K.
Ku K. C.
Liu Xiandong
Lyanda-Geller Yu. B.
Nadgorny Boris
No associations
LandOfFree
Andreev Reflection and Pair Breaking Effects at the Superconductor/Magnetic Semiconductor Interface does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Andreev Reflection and Pair Breaking Effects at the Superconductor/Magnetic Semiconductor Interface, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Andreev Reflection and Pair Breaking Effects at the Superconductor/Magnetic Semiconductor Interface will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-398657