Open Access
Specific heat measurements of Ba(0.68)K(0.32)Fe2As2 single crystals: evidence for a multiband strong-coupling superconducting state.
P. Popovich
1
,
A. V. Boris
1, 2
,
A.V Boris
1, 2
,
O. V. DOLGOV
1
,
A. A. Golubov
3
,
D.-L. Sun
1
,
D. Q. Sun
1
,
C.T. Lin
1
,
C. C. Lin
1
,
R.K. Kremer
1
,
B. Keimer
1
,
Bernhard Keimer
1
Publication type: Journal Article
Publication date: 2010-07-07
scimago Q1
wos Q1
SJR: 2.856
CiteScore: 15.6
Impact factor: 9.0
ISSN: 00319007, 10797114
PubMed ID:
20867730
General Physics and Astronomy
Abstract
The specific heat of high-purity Ba(0.68)K(0.32)Fe2As2 single crystals with the highest reported superconducting Tc=38.5 K was studied. The electronic specific heat Cp below Tc shows two gap features, with Δ1≈11 meV and Δ2≈3.5 meV obtained from an α-model analysis. The reduced gap value, 2Δ(max)/kBTc≈6.6, the magnitude of the specific-heat jump, ΔCp(Tc)/Tc, and its slope below Tc exhibit a strong-coupling character. We also show that an Eliashberg model with two hole and two electron bands gives the correct values of Tc, the superconducting gaps, and the free-energy difference.
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Total citations:
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Popovich P. et al. Specific heat measurements of Ba(0.68)K(0.32)Fe2As2 single crystals: evidence for a multiband strong-coupling superconducting state. // Physical Review Letters. 2010. Vol. 105. No. 2. 027003
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Popovich P., Boris A. V., Boris A., DOLGOV O. V., Golubov A. A., Golubov A. A., Sun D., Sun D. Q., Lin C., Lin C. C., Kremer R., Kremer R. K., Keimer B., Keimer B. Specific heat measurements of Ba(0.68)K(0.32)Fe2As2 single crystals: evidence for a multiband strong-coupling superconducting state. // Physical Review Letters. 2010. Vol. 105. No. 2. 027003
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TY - JOUR
DO - 10.1103/PhysRevLett.105.027003
UR - https://doi.org/10.1103/PhysRevLett.105.027003
TI - Specific heat measurements of Ba(0.68)K(0.32)Fe2As2 single crystals: evidence for a multiband strong-coupling superconducting state.
T2 - Physical Review Letters
AU - Popovich, P.
AU - Boris, A. V.
AU - Boris, A.V
AU - DOLGOV, O. V.
AU - Golubov, A. A.
AU - Golubov, Alexander A.
AU - Sun, D.-L.
AU - Sun, D. Q.
AU - Lin, C.T.
AU - Lin, C. C.
AU - Kremer, R.K.
AU - Kremer, Reinhard K.
AU - Keimer, B.
AU - Keimer, Bernhard
PY - 2010
DA - 2010/07/07
PB - American Physical Society (APS)
IS - 2
VL - 105
PMID - 20867730
SN - 0031-9007
SN - 1079-7114
ER -
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@article{2010_Popovich,
author = {P. Popovich and A. V. Boris and A.V Boris and O. V. DOLGOV and A. A. Golubov and Alexander A. Golubov and D.-L. Sun and D. Q. Sun and C.T. Lin and C. C. Lin and R.K. Kremer and Reinhard K. Kremer and B. Keimer and Bernhard Keimer},
title = {Specific heat measurements of Ba(0.68)K(0.32)Fe2As2 single crystals: evidence for a multiband strong-coupling superconducting state.},
journal = {Physical Review Letters},
year = {2010},
volume = {105},
publisher = {American Physical Society (APS)},
month = {jul},
url = {https://doi.org/10.1103/PhysRevLett.105.027003},
number = {2},
pages = {027003},
doi = {10.1103/PhysRevLett.105.027003}
}
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