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We have observed the conduction electron spin resonance (CESR) in finepowders of MgB2 both in the superconducting and normal states. The Paulisusceptibility is chi_s=2.0*10^{-5} emu/mole in the temperature range of 450 to600 K. The spin relaxation rate has an anomalous temperature dependence. TheCESR measured below T_c at several frequencies suggests that MgB_2 is astrongly anisotropic superconductor with the upper critical field, H_c2,ranging between 2 and 16 T. The high-field reversible magnetization data of arandomly oriented powder sample are well described assuming that MgB_2 is ananisotropic superconductor with H_c2^{ab} / H_{c2}^{c} \approx 6--9.Comment: 4 pages, 4 eps figure

physical review letters

Anisotropy of Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>as Seen in Electron Spin Resonance and Magnetization Data

Anisotropy of SuperconductingMgB2as Seen in Electron Spin Resonance and Magnetization Data