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

Phys. Rev. Lett. 87, 047002 – Published 10 July 2001
F. Simon, A. Jánossy, T. Fehér, F. Murányi, S. Garaj, L. Forró, C. Petrovic, S. L. Bud'ko, G. Lapertot, V. G. Kogan, and P. C. Canfield

Abstract

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=2.0×10-5 emu/mole in the temperature range of 450 to 600 K. 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 16 T. The high-field reversible magnetization data of a randomly oriented powder sample are well described assuming that MgB2 is an anisotropic superconductor with Hc2ab/Hc2c69.

DOI: http://dx.doi.org/10.1103/PhysRevLett.87.047002

  • Received 27 April 2001
  • Published 10 July 2001

© 2001 The American Physical Society

Authors & Affiliations

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

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

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