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

doi:10.1007/s10909-012-0832-z

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^*

^*此作品的通信作者

物理學系

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

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
卷	171
發行號	1-2
DOIs	https://doi.org/10.1007/s10909-012-0832-z
出版狀態	已發佈 - 2013 4月

ASJC Scopus subject areas

原子與分子物理與光學
一般材料科學
凝聚態物理學

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10.1007/s10909-012-0832-z

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title = "Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2",

abstract = "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.",

keywords = "122-layer germanide, Heat capacity, Superconducting materials",

author = "Hung, \{T. L.\} and Chen, \{I. A.\} and Huang, \{C. H.\} and Lin, \{C. Y.\} and Chen, \{C. W.\} and You, \{Y. B.\} and Jian, \{S. T.\} and Yang, \{M. C.\} and Hsu, \{Y. Y.\} and Ho, \{J. C.\} and Chen, \{Y. Y.\} and Ku, \{H. C.\}",

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T1 - Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2

AU - Hung, T. L.

AU - Chen, I. A.

AU - Huang, C. H.

AU - Lin, C. Y.

AU - Chen, C. W.

AU - You, Y. B.

AU - Jian, S. T.

AU - Yang, M. C.

AU - Hsu, Y. Y.

AU - Ho, J. C.

AU - Chen, Y. Y.

AU - Ku, H. C.

PY - 2013/4

Y1 - 2013/4

N2 - 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.

AB - 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.

KW - 122-layer germanide

KW - Heat capacity

KW - Superconducting materials

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

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