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Breakdown of the Korringa Law of Nuclear Spin Relaxation in Metallic GaAs

Tue, 2013-11-19 00:24 - Lukas Hanschke
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Date: 
2012-08-21
Author(s): 

D. Kölbl, D. M. Zumbühl, A. Fuhrer, G. Salis, and S. F. Alvarado

Reference: 

Phys. Rev. Lett. 109, 086601 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.109.086601

We present nuclear spin relaxation measurements in GaAs epilayers using a new pump-probe technique in all-electrical, lateral spin-valve devices. The measured T1 times agree very well with NMR data available for T>1  K. However, the nuclear spin relaxation rate clearly deviates from the well-established Korringa law expected in metallic samples and follows a sublinear temperature dependence T1-1∝T0.6 for 0.1  K≤T≤10  K. Further, we investigate nuclear spin inhomogeneities.