Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

10-1-2012

Journal or Book Title

Physical Review B

Volume

86

Issue

14

First Page

144501

DOI

10.1103/PhysRevB.86.144501

Abstract

The superconductor TmNi2B2C possesses a significant fourfold basal plane anisotropy, leading to a square vortex lattice (VL) at intermediate fields. However, unlike other members of the borocarbide superconductors, the anisotropy in TmNi2B2C appears to decrease with increasing field, evident by a reentrance of the square VL phase. We have used small-angle neutron scattering measurements of the VL to study the field dependence of the anisotropy. Our results provide a direct, quantitative measurement of the decreasing anisotropy. We attribute this reduction of the basal plane anisotropy to the strong Pauli paramagnetic effects observed in TmNi2B2C and the resulting expansion of vortex cores near Hc2.

Comments

This article is published as Das, P., J. M. Densmore, C. Rastovski, K. J. Schlesinger, Mark Laver, C. D. Dewhurst, K. Littrell, Serguei L. Bud'ko, Paul C. Canfield, and M. R. Eskildsen. "Field dependence of the superconducting basal plane anisotropy of TmNi 2 B 2 C." Physical Review B 86, no. 14 (2012): 144501. DOI: 10.1103/PhysRevB.86.144501.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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