Generalized Elliott-Yafet Theory of Electron Spin Relaxation in Metals: Origin of the Anomalous Electron Spin Lifetime in MgB2

TitleGeneralized Elliott-Yafet Theory of Electron Spin Relaxation in Metals: Origin of the Anomalous Electron Spin Lifetime in MgB2
Publication TypeJournal Article
Year of Publication2008
AuthorsSimon F, Dora B, Muranyi F, Janossy A, Garaj S, Forro L, Bud'ko S, Petrovic C, Canfield PC
Journal TitlePhysical Review Letters
Volume101
Pages177003
Date Published10/01
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000260383600054
KeywordsRESONANCE, superconductivity, TRANSPORT
Abstract

The temperature dependence of the electron-spin relaxation time in MgB2 is anomalous as it does not follow the resistivity above 150 K; it has a maximum around 400 K and decreases for higher temperatures. This violates the well established Elliot-Yafet theory of spin relaxation in metals. The anomaly occurs when the quasiparticle scattering rate (in energy units) is comparable to the energy difference between the conduction and a neighboring bands. The anomalous behavior is related to the unique band structure of MgB2 and the large electron-phonon coupling. The saturating spin relaxation is the spin transport analogue of the Ioffe-Regel criterion of electron transport.

DOI10.1103/PhysRevLett.101.177003
Alternate JournalPhys. Rev. Lett.