Conventional superconductivity in SrPd 2Ge 2
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
The American Physical SocietyDate
2012-01-25Citation
10.1103/PhysRevB.85.014520
Physycal Review B 85.1 (2012): 014520
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.85.014520Funded by
This work was supported by the DFG priority program SPP1458, Grants No. KN393/4, BO1912/2-1, and No. BO3537/1-1 (D.S.I. and J.T.P.); by the Slovak Research and Development Agency under Contract No. VVCE-0058-07, Slovak VEGA Grants No. 0148/10 and No. 1/0138/10, and the 7th FP MNT-ERA.Net II. ESO (T.S., P.S., J.G.R, and P.S.); by the Spanish MEC under projects Consolider Ingenio Molecular Nanoscience CSD2007-00010 and FIS2008-00454 (J.G.R.); and by the Korean government (MEST) Grants No. R15-2008-006-01002-0 and 2011-0028736 (N.H.S., B.K.C.)Editor's Version
http://dx.doi.org/10.1103/PhysRevB.85.014520Subjects
FísicaRights
© 2012 American Physical SocietyAbstract
The electronic structure of SrPd2Ge2 single crystals is studied by angle-resolved photoemission spectroscopy (ARPES), scanning tunneling spectroscopy (STS), and band structure calculations within the local-density approximation (LDA). The STS measurements show a single s-wave superconducting energy gap (0) = 0.5 meV. The photon-energy dependence of the observed Fermi surface reveals a strongly three-dimensional character of the corresponding electronic bands. By comparing the experimentally measured and calculated Fermi velocities a renormalization factor of 0.95 is obtained, which is much smaller than typical values reported in Fe-based superconductors. We ascribe such an unusually low band renormalization to the different orbital character of the conduction electrons and, using ARPES and STS data, argue that SrPd2Ge2 is likely to be a conventional superconductor, which makes it clearly distinct from isostructural iron pnictide superconductors of the “122” family
Files in this item
Google Scholar:Kim, T. K.
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Yaresko, A. N.
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Zabolotnyy, V. B.
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Kordyuk, A. A.
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Evtushinsky, D. V.
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Sung, N. H.
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Cho, B. K.
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Samuely, T.
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Szabó, P.
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Rodrigo Rodríguez, José Gabriel
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Park, J. T.
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Inosov, D. S.
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Samuely, P.
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Büchner, B.
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Borisenko, S. V.
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