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Fermi-surface evolution in Yb-substituted CeCoIn5

  • Author(s): Polyakov, A
  • Ignatchik, O
  • Bergk, B
  • Götze, K
  • Bianchi, AD
  • Blackburn, S
  • Prévost, B
  • Seyfarth, G
  • Côté, M
  • Hurt, D
  • Capan, C
  • Fisk, Z
  • Goodrich, RG
  • Sheikin, I
  • Richter, M
  • Wosnitza, J
  • et al.
Abstract

We report results of systematic de Haas-van Alphen (dHvA) studies on Ce1-xYbxCoIn5single crystals with varying Yb concentration. For x=0.1, the well-known Fermi surfaces and the heavy effective masses of CeCoIn5(x=0) have changed only slightly. We start to observe changes of the Fermi-surface topology at x=0.2 leading to a drastic reconstruction above x=0.55. At these concentrations, the effective masses are reduced considerably to values between 0.7 and 2.6 free electron masses. For both YbCoIn5and CeCoIn5, the angular-resolved dHvA frequencies can be very well described by conventional density-functional theory calculations. Projection of the Bloch states onto atomic Yb-4f orbitals yields a 4f occupation of 13.7 electrons, in agreement with previous experimental results indicating an intermediate Yb valence of +2.3. © 2012 American Physical Society.

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