Origin of the anisotropic upper critical fields in single crystals of superconducting rare-earth ternary borides

G. K. Shenoy; S. K. Malik

doi:10.1103/PhysRevB.33.6132

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Origin of the anisotropic upper critical fields in single crystals of superconducting rare-earth ternary borides

G. K. Shenoy, S. K. Malik

DOI 10.1103/PhysRevB.33.6132 · Physical Review B

T1

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Abstract

Upper-critical-field [Hc2(T)] measurements in single-crystal ErRh4B4 have revealed a large anisotropy. We show that this anisotropy is a consequence of the crystalline electric fields (CEF’s) acting on the Er3+ ion which make the exchange field acting on the conduction electrons anisotropic. A full calculation based on Werthamer-Helfand-Hohenberg theory with the inclusion of CEF’s completely explains the observed anisotropy in Hc2(T) for ErRh4B4. In addition, the critical-field measurements in ErRh4B4 provide a means for the reliable determination of the magnitude and the sign of the exchange constant Jsf.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ErRh4B4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LuRh4B4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.36	Pressure not reported	unknown