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Phys. Rev. B 72, 012511 (2005) [4 pages]

Magnetic-field-induced density of states in MgB2: Spin susceptibility measured by conduction-electron spin resonance

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F. Simon1,2, A. Jánossy1, T. Fehér1,2, F. Murányi1, S. Garaj2, L. Forró2, C. Petrovic3,*, S. Bud’ko3, R. A. Ribeiro3, and P. C. Canfield3
1Budapest University of Technology and Economics, Institute of Physics and Solids in Magnetic Fields Research Group of the Hungarian Academy of Sciences, H-1521 Budapest, P.O. Box 91, Hungary
2Institute of Physics of Complex Matter, EPFL, CH-1015 Lausanne, Switzerland
3Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 1 March 2005; revised 2 June 2005; published 22 July 2005

The magnetic-field dependence of the electron spin susceptibility χs was measured in the superconducting state of high-purity MgB2 fine powders from the intensity of the conduction-electron spin resonance at 3.8, 9.4, and 35 GHz. The measurements confirm that a large part of the density of states is restored at low temperatures at fields below 1 T in qualitative agreement with the closing of the π band gaps in the two-band model. However, the increase of χs with field and temperature is larger than expected from current superconductor models of MgB2.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.012511
DOI:
10.1103/PhysRevB.72.012511
PACS:
74.70.Ad, 74.25.Ha, 74.25.Nf, 76.30.Pk

*Present address: Department of Physics, Brookhaven National Laboratory, Upton, New York 11973.

 
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