Magnetic-field-induced density of states in MgB2: Spin susceptibility measured by conduction-electron spin resonance

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Simon, F.
Jánossy, A.
Fehér, T.
Murányi, F.
Garaj, T.
Forró, L.
Petrovic, C.
Bud'ko, Sergey L.
Ribeiro, R. A.
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American Physical Society
Canfield, Paul
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Physics and Astronomy
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Ames National Laboratory

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The magnetic-field dependence of the electron spin susceptibility chi(s) was measured in the superconducting state of high-purity MgB2 fine powders from the intensity of the conduction-electron spin resonance at 3.8, 9.4, and 35 GHz. The measurements confirm that a large part of the density of states is restored at low temperatures at fields below 1 T in qualitative agreement with the closing of the pi band gaps in the two-band model. However, the increase of chi(s) with field and temperature is larger than expected from current superconductor models of MgB2.
This article is published as Simon, Ferenc, András Jánossy, Titusz Fehér, Ferenc Murányi, S. Garaj, L. Forró, C. Petrovic, S. Bud’ko, R. A. Ribeiro, and P. C. Canfield. "Magnetic-field-induced density of states in Mg B 2: Spin susceptibility measured by conduction-electron spin resonance." Physical Review B 72, no. 1 (2005): 012511. DOI: 10.1103/PhysRevB.72.012511. Copyright 2005 American Physical Society. Posted with permission.