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
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 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 * Current address: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA. [ Abstract | Previous article | Next article | Issue 23 ] |
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