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

Ślebarski, A.; Zajdel, P.; Fijałkowski, M.; Maśka, M. M.; Witas, P.; Goraus, J.; Fang, Y.; Arnold, D. C.; Maple, M. B.

doi:10.1088/1367-2630/aae4a8

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

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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 Ca₃Rh₄Sn₁₃ doped with La (Ca_3–x La _x Rh₄Sn₁₃) or Ce (Ca_3–x Ce _x Rh₄Sn₁₃) 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 Ca₃Rh₄Sn₁₃ showed that in the disordered Ca_3–x Ce _x Rh₄Sn₁₃ alloys the presence of spin-glass effects is the cause of the additionalmore »« less

Authors:: Ślebarski, A.; Zajdel, P.; Fijałkowski, M.; Maśka, M. M.; Witas, P.; Goraus, J.; Fang, Y.; Arnold, D. C.; Maple, M. B.

Publication Date:: Mon Oct 01 00:00:00 EDT 2018

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:: 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

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                    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.

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                    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.  https://doi.org/10.1088/1367-2630/aae4a8

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                    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.  https://doi.org/10.1088/1367-2630/aae4a8.

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@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},

  number       = 10,

  volume       = 20,

  place        = {United Kingdom},

  year         = {Mon Oct 01 00:00:00 EDT 2018},

  month        = {Mon Oct 01 00:00:00 EDT 2018}

}

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

Abstract

Citation Formats

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