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

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2001-07-23
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Simon, F.
Jánossy, A.
Fehér, T
Murányi, F.
Garaj, S.
Forró, L.
Petrovic, C.
Bud'ko, Sergey L.
Lapertot, G.
Kogan, V. G.
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American Physical Society
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Ames National Laboratory
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 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 MgB2 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 MgB2 is an anisotropic superconductor with H-c2(ab)/H-c2(c) approximate to 6-9.
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This article is published as Simon, Ferenc, András Jánossy, Titusz Fehér, Ferenc Murányi, S. Garaj, L. Forró, C. Petrovic et al. "Anisotropy of superconducting MgB 2 as seen in electron spin resonance and magnetization data." Physical Review Letters 87, no. 4 (2001): 047002. DOI: 10.1103/PhysRevLett.87.047002. Copyright 2001 American Physical Society. Posted with permission.
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