Neha, P. and Srivastava, P. and Jha, S. R. and -, Shruti and Awana, V. P. S. and Patnaik, S. (2016) Improved superconducting properties of La3Co4Sn13 with indium substitution. Journal of Alloys and Compounds, 665. pp. 333-338. ISSN 0925-8388

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We report two fold increase in superconducting transition temperature of La3Co4Sn13 by substituting indium at the tin site. The transition temperature of this skutterudite related compound is observed to increase from 2.5 K to 5.1 K for 10% indium substituted sample. The band structure and density of states calculations also indicate such a possibility. The compounds exhibit type-II superconductivity and the values of lower critical field (H-c1), upper critical field (H-c2), GinzburgeLandau coherence length (xi), penetration depth (lambda) and GL parameter (kappa) are estimated to be 0.0028 T, 0.68 T, 21.6 nm, 33.2 nm and 1.53 respectively for La3Co4Sn11.7In1.3. Hydrostatic external pressure leads to decrease in transition temperature and the calculated pressure coefficient is -0.311 K/GPa. Flux pinning and vortex activation energies also improved with indium addition. Only positive frequencies are observed in phonon dispersion curve that relate to the absence of charge density wave or structural instability in the normal state.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords: Superconductivity Upper critical field Band structure and density of states Vortex dynamics
Subjects: Chemistry > Physical Chemistry
Materials Science
Metallurgy & Metallurgical Engineering
Depositing User: Dr. Rajpal Walke
Date Deposited: 30 Jan 2018 08:01
Last Modified: 30 Jan 2018 08:01

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