Breakup of Heavy Fermions on the Brink of “Phase A” in CeCu2Si2

P. Gegenwart, C. Langhammer, C. Geibel, R. Helfrich, M. Lang, G. Sparn, F. Steglich, R. Horn, L. Donnevert, A. Link, and W. Assmus
Phys. Rev. Lett. 81, 1501 – Published 17 August 1998
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Abstract

We report resistivity, ρ(T), and specific-heat, C(T), results on near stoichiometric CeCu2Si2 samples, in the vicinity of a quantum critical point (QCP). The latter is defined by TA0, where TA0.8K marks the transition into a spin-density–wave-type “phase A” which competes with heavy-fermion superconductivity below Tc0.65K. Upon approaching the QCP, ρ(T) and C(T) behave very disparately, suggesting a breakup of the heavy quasiparticles. Very surprising observations are being made for samples with TA>0 also.

  • Received 23 October 1997

DOI:https://doi.org/10.1103/PhysRevLett.81.1501

©1998 American Physical Society

Authors & Affiliations

P. Gegenwart, C. Langhammer, C. Geibel, R. Helfrich, M. Lang, G. Sparn, and F. Steglich*

  • Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

R. Horn, L. Donnevert, and A. Link

  • Institute for Solid State Physics, SFB 252, Darmstadt University of Technology, D-64289 Darmstadt, Germany

W. Assmus

  • Physics Institute, SFB 252, Frankfurt University, D-60325 Frankfurt, Germany

  • *Also at Darmstadt University of Technology, Darmstadt, Germany.

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Vol. 81, Iss. 7 — 17 August 1998

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