Abstract
Electrical resistivity of the filled skutterudite compound LaRu4As12 was investigated both as a function of temperature and magnetic field. Upon lowering temperature below around 0.85T c ≈ 9K, the upper critical field increases quasilinearly with the slope (−dH c2/dT)=1.11 T/K, i.e., significantly faster than in the vicinity of T c where (−dH c2/dT)T c = 0.66T/K was found. As a consequence, a positive curvature emerges whose size is very similar to those observed for anisotropic superconductors. Anticipating a weakly anisotropic Fermi surface in the cubic compound LaRu4As12, we related the anomaly in Hc 2(T) to multiband effects rather than to a strong anisotropy of a single energy gap.
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Cichorek, T., Bochenek, L., Wawryk, R. et al. Upper critical field peculiarities in the cubic superconductor LaRu4As12 . Journal of the Korean Physical Society 62, 1555–1557 (2013). https://doi.org/10.3938/jkps.62.1555
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DOI: https://doi.org/10.3938/jkps.62.1555