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Specific heat of FeSe: Two gaps with different anisotropy in superconducting state

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dc.contributor.author Muratov A.
dc.contributor.author Sadakov A.
dc.contributor.author Gavrilkin S.
dc.contributor.author Prishchepa A.
dc.contributor.author Epifanova G.
dc.contributor.author Chareev D.
dc.contributor.author Pudalov V.
dc.date.accessioned 2018-04-05T07:09:25Z
dc.date.available 2018-04-05T07:09:25Z
dc.date.issued 2017
dc.identifier.issn 0921-4526
dc.identifier.uri http://dspace.kpfu.ru/xmlui/handle/net/129725
dc.description.abstract © 2017 Elsevier B.V. We present detailed study of specific heat of FeSe single crystals with critical temperature Tc=8.45 K at 0.4-200 K in magnetic fields 0-9 T. Analysis of the electronic specific heat at low temperatures shows the coexistence of isotropic s-wave gap and strongly anisotropic extended s-wave gap without nodes. It was found two possibilities of superconducting gap parameters which give equally description of experimental data: (i) two gaps with approximately equal amplitudes and weight contribution to specific heat: isotropic δ1=1.7 meV (2δ1/kBTc=4.7) and anisotropic gap with the amplitude δ2max=1.8 meV (2δ2max/kBTc=4.9 and anisotropy parameter m=0.85); (ii) two gaps with substantially different values: isotropic large gap δ1=1.65 meV (2δ1/kBTc=4.52) and anisotropic small gap δ2max=0.75 meV (2δ2max/kBTc=2) with anisotropy parameter m=0.71. These results are confirmed by the field behavior of the residual electronic specific heat γr.
dc.relation.ispartofseries Physica B: Condensed Matter
dc.subject Fe-based superconductors
dc.subject FeSe
dc.subject Specific heat
dc.subject Superconductors
dc.subject Two-gap superconductivity
dc.title Specific heat of FeSe: Two gaps with different anisotropy in superconducting state
dc.type Article in Press
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS09214526-2017-SID85032787134


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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