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

Kölbl, D. and Zumbühl, D. M. and Fuhrer, A. and Salis, G. and Alvarado, S. F.. (2012) Breakdown of the Korringa Law of Nuclear Spin Relaxation in Metallic GaAs. Physical review letters, Vol. 109 , 086601.

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Official URL: http://edoc.unibas.ch/dok/A6070654

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Abstract

We present nuclear spin relaxation measurements in GaAs epilayers using a new pump-probe techniquein all-electrical, lateral spin-valve devices. The measured T1 times agree very well with NMR dataavailable forT <1 K. However, the nuclear spin relaxation rate clearly deviates from the well-establishedKorringa law expected in metallic samples and follows a sublinear temperature dependence T1-1~T^0.6 for0.1 K > T > 10 K. Further, we investigate nuclear spin inhomogeneities.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:21
Deposited On:24 May 2013 08:58

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