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16 April 2024

» arxiv » cond-mat/0606730

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Evolution of superconductivity in Pr$_{1-x}$La$_{x}$Os$_{4}$Sb$_{12}$: Upper critical field measurements
C.R. Rotundu ; H. Tsujii ; P. Kumar ; B. Andraka ; H. Sugawara ; Y. Aoki ; H. Sato ; PostScript ; PDF ; Other formats ;
Date:	28 Jun 2006
Subject:	Superconductivity; Strongly Correlated Electrons
Abstract:	Measurements of the upper critical field $H_{c2}$ near $T_c$ of Pr$_{1- x}$La$_{x}$Os$_{4}$Sb$_{12}$ were performed by specific heat. A positive curvature in $H_{c2}$ versus $T$ was observed in samples and concentrations exhibiting two superconducting transitions. These results argue against this curvature being due to two-band superconductivity. The critical field slope - $dH_{c2}/dT$ suggests the existence of a crossover concentration $x_{cr} approx 0.25$, below which there is a rapid suppression of effective electron mass with La-alloying. This crossover concentration was previously detected in the measurement of the discontinuity of $C/T$ at $T_c$.
Source:	arXiv, cond-mat/0606730
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