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Phys. Rev. Lett. 92, 237002 (2004) [4 pages]

Evidence for the Coexistence of an Anisotropic Superconducting Gap and Nonlocal Effects in the Nonmagnetic Superconductor LuNi2B2C

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Tuson Park1, Elbert E. M. Chia2, M. B. Salamon2, E. D. Bauer1, I. Vekhter1,*, J. D. Thompson1, Eun Mi Choi3, Heon Jung Kim3, Sung-Ik Lee3, and P. C. Canfield4
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2Department of Physics and Material Research Laboratory, University of Illinois at Urbana-Champaign, Illinois 61801, USA
3National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
4Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 17 October 2003; published 10 June 2004

A study of the dependence of the heat capacity Cp(α) on the field angle in LuNi2B2C reveals an anomalous disorder effect. For pure samples, Cp(α) exhibits a fourfold variation as the field H<Hc2 is rotated in the [001] plane, with minima along ⟨100⟩ (α=0). A slightly disordered sample, however, develops anomalous secondary minima along ⟨110⟩ for μ0H>1   T, leading to an eightfold pattern at 2 K and 1.5 T. The anomalous pattern is discussed in terms of coexisting superconducting gap anisotropy and nonlocal effects.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.237002
DOI:
10.1103/PhysRevLett.92.237002
PACS:
74.25.Bt, 74.20.Rp, 74.25.Op, 74.62.Dh

*Current address: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.

 
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