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Phys. Rev. B 76, 024519 (2007) [5 pages]

Spin-lattice relaxation time of conduction electrons in MgB2

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F. Simon*, F. Murányi†, T. Fehér, and A. Jánossy
Institute of Physics and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box 91, Hungary

L. Forró
IPMC/SB Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne-EPFL, Switzerland

C. Petrovic‡, S. L. Bud’ko, and P. C. Canfield
Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 3 April 2007; revised 8 May 2007; published 26 July 2007

The spin-lattice relaxation time, T1, of conduction electrons is measured as a function of temperature and magnetic field in MgB2 in the normal and superconducting states. The method is based on the detection of the z component of the conduction electron magnetization under electron-spin-resonance conditions with amplitude-modulated microwave excitation. Measurement of T1 below Tc at 0.32 T allows us to disentangle contributions from the two Fermi surfaces of MgB2, as this field restores the normal state on the part of the Fermi surface with π symmetry only.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.024519
DOI:
10.1103/PhysRevB.76.024519
PACS:
74.70.Ad, 74.25.Nf, 76.30.Pk, 74.25.Ha

*Corresponding author. simon@esr.phy.bme.hu

†Present address: Leibniz Institute for Solid State and Materials Research Dresden, PF 270116 D-01171 Dresden, Germany.

‡Present address: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

 
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