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

被引：17

作者：

Simon, F. ^{[1
,2
]}

Dora, B. ^{[1
,2
,3
]}

Muranyi, F. ^{[1
,2
]}

Janossy, A. ^{[1
,2
]}

Garaj, S. ^{[4
]}

Forro, L. ^{[4
]}

Bud'ko, S. ^{[5
,6
]}

Petrovic, C. ^{[5
,6
]}

Canfield, P. C. ^{[5
,6
]}

机构：

[1] Budapest Univ Technol & Econ, Inst Phys, H-1521 Budapest, Hungary

[2] Hungarian Acad Sci, Condensed Matter Res Grp, H-1521 Budapest, Hungary

[3] Phys Komplexer Syst, Max Planck Inst, D-01187 Dresden, Germany

[4] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Inst Phys Complex Matter, FBS, CH-1015 Lausanne, Switzerland

[5] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[6] Iowa State Univ, US Dept Energy, Ames Lab, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.101.177003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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