Anisotropic upper critical field of LuNi2B2C

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1997-09-01
Authors
Metlushko, V
Welp, U
Koshelev, A
Aranson, I
Crabtree, GW
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American Physical Society
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Physics and Astronomy
Abstract
The upper critical field, H-c2, Of LuNi2B2C has been determined from the temperature dependence of the magnetization. A temperature dependent anisotropy within the basal plane which decreases from a value of 1.1 at 4.5 K to a value of 1.0 at T-c and an almost temperature independent out-of-plane anisotropy have been observed. Near T-c the upper critical field along all directions shows a strong upward curvature. These features of H-c2 can be explained quantitatively using a nonlocal extension of the Ginzburg-Landau equations. The Fermi velocity averages determined from these measurements and those obtained in band structure calculations are in good agreement.
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This article is published as Metlushko, V., U. Welp, A. Koshelev, I. Aranson, G. W. Crabtree, and P. C. Canfield. "Anisotropic Upper Critical Field of LuN i 2 B 2 C." Physical Review Letters 79, no. 9 (1997): 1738. DOI: 10.1103/PhysRevLett.79.1738. Copyright 1997 American Physical Society. Posted with permission.
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