Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data

Details Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data Anisotropy of superconducting MgB2 as seen in electron spin resonance and magnetization data

2001-04-28

arxiv.org/abs/cond-mat/0104557v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.87.047002

We have observed the conduction electron spin resonance (CESR) in fine powders of MgB2 both in the superconducting and normal states. The Pauli susceptibility is chi_s=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 T_c at several frequencies suggests that MgB_2 is a strongly anisotropic superconductor with the upper critical field, H_c2, ranging between 2 and 16 T. The high-field reversible magnetization data of a randomly oriented powder sample are well described assuming that MgB_2 is an anisotropic superconductor with H_c2^{ab} / H_{c2}^{c} \approx 6--9.

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