Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2

T. L. Hung, I. A. Chen, C. H. Huang, C. Y. Lin, C. W. Chen, Y. B. You, S. T. Jian, M. C. Yang, Y. Y. Hsu, J. C. Ho, Y. Y. Chen, H. C. Ku

研究成果: 雜誌貢獻文章

7 引文 斯高帕斯(Scopus)

摘要

Low-temperature heat capacity C(T) of the weakly electron-correlated SrNi2Ge2 122-layer compound undergoes a superconducting transition with onset at 1.4 K and a bulk T c =0.75 K, where heat-capacity jump ratio ΔC(T c )/γT c =0.88-1.05. A small average superconducting energy gap E g (ave)=2.21 kT c =0.14 meV is derived for this multi-gap superconductor. Similar results for isostructural SrPd2Ge2 include T c (onset)=3.5 K, bulk T c of 2.92 K, ΔC(T c )/γT c =0.70 and E g (ave)=2.54 kT c =0.64 meV. The higher T c onset could be associated with stoichiometric 1:2:2 grains in the polycrystalline samples. In addition, deviations of E g /kT c from the BCS ratio of 3.5 suggest that, just like their iron-based counterpart, these 122-layer germanides may also exhibit an unconventional, fully-opened multi-gap s-wave superconductivity.

原文英語
頁(從 - 到)148-155
頁數8
期刊Journal of Low Temperature Physics
171
發行號1-2
DOIs
出版狀態已發佈 - 2013 四月 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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    Hung, T. L., Chen, I. A., Huang, C. H., Lin, C. Y., Chen, C. W., You, Y. B., Jian, S. T., Yang, M. C., Hsu, Y. Y., Ho, J. C., Chen, Y. Y., & Ku, H. C. (2013). Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2. Journal of Low Temperature Physics, 171(1-2), 148-155. https://doi.org/10.1007/s10909-012-0832-z