Nonlocal effects in angular dependence of in-plane magnetization of tetragonal superconductors

V. G. Kogan; S. L. Bud’ko; P. C. Canfield; P. Miranović

doi:10.1103/PhysRevB.60.R12577

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Nonlocal effects in angular dependence of in-plane magnetization of tetragonal superconductors

V. G. Kogan, S. L. Bud’ko, P. C. Canfield, P. Miranović

DOI 10.1103/PhysRevB.60.R12577 · Physical Review B

T1

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Abstract

The reversible magnetization M of Lu(Ni1−xCox)2B2C with x=0 and 0.06 is measured in a broad temperature domain as a function of field orientation θ in the basal crystal plane. The data are interpreted within London theory extended for nonlocality of the current-field relation in superconductors. The dependence M(θ) diminishes on warming, vanishes at T*<Tc, and changes sign for T>T*. The low-T sign is opposite to what is expected from the known angular dependence of the upper critical field and therefore cannot be attributed to the latter. Upon doping with Co, the effect disappears with decreasing mean-free path in agreement with theory.

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.	16	Pressure not reported	unknown
Lu(Ni0.94Co0.06)2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.4	Pressure not reported	unknown