Evidence for the Coexistence of an Anisotropic Superconducting Gap and Nonlocal Effects in the Nonmagnetic Superconductor LuNi2B2C
Tuson Park, Elbert E. M. Chia, M. B. Salamon, E. D. Bauer, I. Vekhter, J. D. Thompson, Eun Mi Choi, Heon Jung Kim, Sung-Ik Lee, P. C. Canfield
DOI 10.1103/PhysRevLett.92.237002 · Physical Review Letters
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure not reported | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.9 | Pressure not reported | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.1 | Pressure not reported | onset |
| Lu(Ni1-xCox)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure not reported | onset |
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