Anisotropic upper critical field of LuNi2B2C
American Physical Society
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Physics and Astronomy
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.
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.