## 摘要

Low-temperature heat capacity C(T) of the weakly electron-correlated SrNi_{2}Ge_{2} 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 SrPd_{2}Ge_{2} 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 |
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頁（從 - 到） | 148-155 |

頁數 | 8 |

期刊 | Journal of Low Temperature Physics |

卷 | 171 |

發行號 | 1-2 |

DOIs | |

出版狀態 | 已發佈 - 2013 四月 |

## ASJC Scopus subject areas

- 原子與分子物理與光學
- 材料科學(全部)
- 凝聚態物理學