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Title: The effective increase in atomic scale disorder by doping and superconductivity in Ca 3 Rh 4 Sn 13

Abstract

Here, a comprehensive study of the electronic structure, thermodynamic and electrical transport properties reveals the existence of inhomogeneous superconductivity due to structural disorder in Ca 3Rh 4Sn 13 doped with La (Ca 3–x La x Rh 4Sn 13) or Ce (Ca 3–x Ce x Rh 4Sn 13) with superconducting critical temperatures T c* higher than those (T c ) observed in the parent compounds. The T – x diagrams and the entropy S(x) T isotherms document well the relation between the degree of atomic disorder and separation of the high-temperature T c* and T c -bulk phases. In these dirty superconductors, with the mean free path much smaller than the coherence length, the Werthamer–Helfand–Hohenber theoretical model does not fit well the H c2(T) data. We demonstrate that this discrepancy can result from the presence of strong inhomogeneity or from two-band superconductivity in these systems. Both the approaches very well describe the H – T dependencies, but the present results as well as our previous studies give stronger arguments for the scenario based on the presence of nanoscopic inhomogeneity of the superconducting state. A comparative study of La-doped and Ce-doped Ca 3Rh 4Sn 13 showed that in the disordered Ca 3–xmore » Ce x Rh 4Sn 13 alloys the presence of spin-glass effects is the cause of the additional increase of T c* in respect to the critical temperatures of disordered Ca 3–x La x Rh 4Sn 13. We also revisited the nature of structural phase transition at T* ~ 130 K and documented that there might be another precursor transition at higher temperatures. Raman spectroscopy and thermodynamic properties suggest that this structural transition may be associated with a CDW-type instability.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of California, San Diego, La Jolla, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1477518
Alternate Identifier(s):
OSTI ID: 1483670
Grant/Contract Number:  
NA0002909
Resource Type:
Journal Article: Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 20 Journal Issue: 10; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; atomic disorder; electronic band structure; thermodynamic and transport properties

Citation Formats

Ślebarski, A., Zajdel, P., Fijałkowski, M., Maśka, M. M., Witas, P., Goraus, J., Fang, Y., Arnold, D. C., and Maple, M. B. The effective increase in atomic scale disorder by doping and superconductivity in Ca 3 Rh 4 Sn 13. United Kingdom: N. p., 2018. Web. doi:10.1088/1367-2630/aae4a8.
Ślebarski, A., Zajdel, P., Fijałkowski, M., Maśka, M. M., Witas, P., Goraus, J., Fang, Y., Arnold, D. C., & Maple, M. B. The effective increase in atomic scale disorder by doping and superconductivity in Ca 3 Rh 4 Sn 13. United Kingdom. doi:10.1088/1367-2630/aae4a8.
Ślebarski, A., Zajdel, P., Fijałkowski, M., Maśka, M. M., Witas, P., Goraus, J., Fang, Y., Arnold, D. C., and Maple, M. B. Mon . "The effective increase in atomic scale disorder by doping and superconductivity in Ca 3 Rh 4 Sn 13". United Kingdom. doi:10.1088/1367-2630/aae4a8.
@article{osti_1477518,
title = {The effective increase in atomic scale disorder by doping and superconductivity in Ca 3 Rh 4 Sn 13},
author = {Ślebarski, A. and Zajdel, P. and Fijałkowski, M. and Maśka, M. M. and Witas, P. and Goraus, J. and Fang, Y. and Arnold, D. C. and Maple, M. B.},
abstractNote = {Here, a comprehensive study of the electronic structure, thermodynamic and electrical transport properties reveals the existence of inhomogeneous superconductivity due to structural disorder in Ca3Rh4Sn13 doped with La (Ca3–x La x Rh4Sn13) or Ce (Ca3–x Ce x Rh4Sn13) with superconducting critical temperatures Tc* higher than those (T c ) observed in the parent compounds. The T – x diagrams and the entropy S(x) T isotherms document well the relation between the degree of atomic disorder and separation of the high-temperature Tc* and T c -bulk phases. In these dirty superconductors, with the mean free path much smaller than the coherence length, the Werthamer–Helfand–Hohenber theoretical model does not fit well the H c2(T) data. We demonstrate that this discrepancy can result from the presence of strong inhomogeneity or from two-band superconductivity in these systems. Both the approaches very well describe the H – T dependencies, but the present results as well as our previous studies give stronger arguments for the scenario based on the presence of nanoscopic inhomogeneity of the superconducting state. A comparative study of La-doped and Ce-doped Ca3Rh4Sn13 showed that in the disordered Ca3–x Ce x Rh4Sn13 alloys the presence of spin-glass effects is the cause of the additional increase of Tc* in respect to the critical temperatures of disordered Ca3–x La x Rh4Sn13. We also revisited the nature of structural phase transition at T* ~ 130 K and documented that there might be another precursor transition at higher temperatures. Raman spectroscopy and thermodynamic properties suggest that this structural transition may be associated with a CDW-type instability.},
doi = {10.1088/1367-2630/aae4a8},
journal = {New Journal of Physics},
issn = {1367-2630},
number = 10,
volume = 20,
place = {United Kingdom},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1367-2630/aae4a8

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Cited by: 1 work
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