Gaps and kinks in the electronic structure of the superconductor 2H-NbSe2 from angle-resolved photoemission at 1 K

D. J. Rahn, S. Hellmann, M. Kalläne, C. Sohrt, T. K. Kim, L. Kipp, and K. Rossnagel
Phys. Rev. B 85, 224532 – Published 26 June 2012

Abstract

Angle-resolved photoemission spectroscopy at a temperature of 1 K is used to determine the wave-vector dependence of the spectral gap and band renormalization due to electron-phonon coupling in the layered charge-density-wave superconductor 2H-NbSe2. The measured gap size and coupling parameter are Fermi-surface-sheet dependent and anisotropic. The largest energy gap, highest coupling strength, and strongest variation in both quantities are found on the double-walled Nb 4d-derived Fermi-surface sheet that is centered on the corners of the hexagonal Brillouin zone. On this sheet, the spectral gap has two distinct anticorrelated components associated with superconductivity and the charge-density wave. The results establish 2H-NbSe2 as a moderately correlated intermediate-coupling anisotropic multigap superconductor.

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  • Received 7 September 2011

DOI:https://doi.org/10.1103/PhysRevB.85.224532

©2012 American Physical Society

Authors & Affiliations

D. J. Rahn1, S. Hellmann1, M. Kalläne1, C. Sohrt1, T. K. Kim2,*, L. Kipp1, and K. Rossnagel1,†

  • 1Institute of Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany
  • 2Leibniz Institute for Solid State and Materials Research Dresden, 01171 Dresden, Germany

  • *Present address: Diamond Light Source, Didcot OX11 0DE, United Kingdom.
  • Corresponding author: rossnagel@physik.uni-kiel.de

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Issue

Vol. 85, Iss. 22 — 1 June 2012

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