Anisotropy of Superconducting MgB_2 as Seen in Electron Spin Resonance and Magnetization Data (CROSBI ID 120990)
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Simon, Ferenc ; Janossy, A. ; Feher, T. ; Muranyi, F. ; Garaj, Slaven ; Forro, Laszlo ; Petrović, C. ; Bud'ko, S. L. ; Lapertot, G. ; Kogan, V. G. ; Canfield, P. C.
engleski
Anisotropy of Superconducting MgB_2 as Seen in Electron Spin Resonance and Magnetization Data
We observed the conduction electron spin resonance (CESR) in fine powders of MgB_2 both in the superconducting and normal states. The Pauli susceptibility is chi (s) = 2.0 x 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) approximate to 6-9.
MgB_2 anisotropy; CESR; Magnetic susceptibility; Upper critical field
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