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Phys. Rev. Lett. 87, 047002 (2001) [4 pages]

Anisotropy of Superconducting MgB2 as Seen in Electron Spin Resonance and Magnetization Data

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F. Simon, A. Jánossy, T. Fehér, and F. Murányi
Institute of Physics, Budapest University of Technology and Economics and Solids in Magnetic Fields Research Group of the Hungarian Academy of Sciences, P.O. Box 91, H-1521 Budapest, Hungary

S. Garaj and L. Forró
Department de Physique, Ecole Polytechnique Federal de Lausanne, CH-1015 Lausanne, Switzerland

C. Petrovic, S. L. Bud'ko, G. Lapertot*, V. G. Kogan, and P. C. Canfield
Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

Received 27 April 2001; published 10 July 2001

We observed the conduction electron spin resonance (CESR) in fine powders of MgB2 both in the superconducting and normal states. The Pauli susceptibility is χs = 2.0×10-5emu/mole in the temperature range of 450 to 600K. The spin relaxation rate has an anomalous temperature dependence. The CESR measured below Tc at several frequencies suggests that MgB2 is a strongly anisotropic superconductor with the upper critical field, Hc2, ranging between 2 and 16T. The high-field reversible magnetization data of a randomly oriented powder sample are well described assuming that MgB2 is an anisotropic superconductor with Hc2ab/Hc2c≈6–9.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.047002
DOI:
10.1103/PhysRevLett.87.047002
PACS:
74.70.Ad, 74.25.Nf, 76.30.Pk, 74.25.Ha

*On leave from Commissariat à l'Energie Atomique, DRFMC-SPSMS, 38054 Grenoble, France.

 
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