Anisotropy of SuperconductingMgB2as Seen in Electron Spin Resonance and Magnetization Data
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Abstract
We observed the conduction electron spin resonance (CESR) in fine powders of ${\mathrm{MgB}}_{2}$ both in the superconducting and normal states. The Pauli susceptibility is ${\ensuremath{\chi}}_{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}\mathrm{emu}/\mathrm{mole}$ in the temperature range of 450 to $600\mathrm{K}$. The spin relaxation rate has an anomalous temperature dependence. The CESR measured below ${T}_{c}$ at several frequencies suggests that ${\mathrm{MgB}}_{2}$ is a strongly anisotropic superconductor with the upper critical field, ${H}_{c2}$, ranging between 2 and $16\mathrm{T}$. The high-field reversible magnetization data of a randomly oriented powder sample are well described assuming that ${\mathrm{MgB}}_{2}$ is an anisotropic superconductor with ${H}_{c2}^{\mathrm{ab}}{/H}_{c2}^{c}\ensuremath{\approx}6--9$.
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