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, Yung-Yuan Hsu, J. C. Ho, Y. Y. Chen, H. C. Ku

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)148-155
Number of pages8
JournalJournal of Low Temperature Physics
Volume171
Issue number1-2
DOIs
Publication statusPublished - 2013 Apr 1

Fingerprint

Superconducting materials
Specific heat
germanides
specific heat
Superconductivity
Energy gap
superconductivity
Iron
deviation
iron
Temperature
Electrons
electrons

Keywords

  • 122-layer germanide
  • Heat capacity
  • Superconducting materials

ASJC Scopus subject areas

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

Cite this

Hung, T. L., Chen, I. A., Huang, C. H., Lin, C. Y., Chen, C. W., You, Y. B., ... 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

Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2. / 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, Yung-Yuan; Ho, J. C.; Chen, Y. Y.; Ku, H. C.

In: Journal of Low Temperature Physics, Vol. 171, No. 1-2, 01.04.2013, p. 148-155.

Research output: Contribution to journalArticle

Hung, TL, Chen, IA, Huang, CH, Lin, CY, Chen, CW, You, YB, Jian, ST, Yang, MC, Hsu, Y-Y, Ho, JC, Chen, YY & Ku, HC 2013, 'Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2', Journal of Low Temperature Physics, vol. 171, no. 1-2, pp. 148-155. https://doi.org/10.1007/s10909-012-0832-z
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, Yung-Yuan ; Ho, J. C. ; Chen, Y. Y. ; Ku, H. C. / Low temperature heat capacity of layered superconductors SrNi 2Ge2 and SrPd2Ge2. In: Journal of Low Temperature Physics. 2013 ; Vol. 171, No. 1-2. pp. 148-155.
@article{392bbe9029834cfe82408c0574ef2274,
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 Yung-Yuan Hsu and Ho, {J. C.} and Chen, {Y. Y.} and Ku, {H. C.}",
year = "2013",
month = "4",
day = "1",
doi = "10.1007/s10909-012-0832-z",
language = "English",
volume = "171",
pages = "148--155",
journal = "Journal of Low Temperature Physics",
issn = "0022-2291",
publisher = "Springer New York",
number = "1-2",

}

TY - JOUR

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, Yung-Yuan

AU - Ho, J. C.

AU - Chen, Y. Y.

AU - Ku, H. C.

PY - 2013/4/1

Y1 - 2013/4/1

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

UR - http://www.scopus.com/inward/record.url?scp=84874238272&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874238272&partnerID=8YFLogxK

U2 - 10.1007/s10909-012-0832-z

DO - 10.1007/s10909-012-0832-z

M3 - Article

AN - SCOPUS:84874238272

VL - 171

SP - 148

EP - 155

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

SN - 0022-2291

IS - 1-2

ER -