Evidence for conventional superconductivity in SrPd2Ge2

Abstract

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 single s-wave superconducting energy gap Δ(0) = 0.5 meV. 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.

submitted to PRB

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Cited by in corpus (8)

• Structural, Thermal, Magnetic and Electronic Transport Properties of the LaNi2(Ge{1-x}P{x})2 System
• Superconducting and Normal State Properties of APd2As2 (A = Ca, Sr, Ba) Single Crystals
• "Cigar" Fermi surface as a possible requisite for superconductivity in iron-based superconductors
• Large magnetic penetration depth and thermal fluctuations in a Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$ (x=0.097) single crystal
• Two-dimensional magnetic interactions in LaFeAsO
• Magnetic penetration depth in single crystals of SrPd${}_2$Ge${}_2$ superconductor
• Anomalous High-Energy Electronic Interaction in Iron-Based Superconductor
• Type II superconductivity in SrPd2Ge2