Upper critical field peculiarities in the cubic superconductor LaRu4As12

Electrical resistivity of the filled skutterudite compound LaRu 4 As 12 was investigated both as a function of temperature and magnetic field. Upon lowering temperature below around 0.85 T c ≈ 9K, the upper critical field increases quasilinearly with the slope (− dH c2 / dT )=1.11 T/K, i.e. , signif...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2013, 62(10), , pp.1555-1557
Main Authors: Cichorek, Tomasz, Bochenek, Lukasz, Wawryk, Ryszard, Henkie, Zygmunt
Format: Article
Language:English
Subjects:
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Theoretical
물리학
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Summary:Electrical resistivity of the filled skutterudite compound LaRu 4 As 12 was investigated both as a function of temperature and magnetic field. Upon lowering temperature below around 0.85 T 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 LaRu 4 As 12 , we related the anomaly in Hc 2 ( T ) to multiband effects rather than to a strong anisotropy of a single energy gap.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.62.1555