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Phys. Rev. Lett. 81, 1501–1504 (1998)

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

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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

Received 23 October 1997; published in the issue dated 17 August 1998

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 TA→0, where TA≲0.8K marks the transition into a spin-density–wave-type “phase A” which competes with heavy-fermion superconductivity below Tc≈0.65K. 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.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1501
DOI:
10.1103/PhysRevLett.81.1501
PACS:
74.70.Tx, 75.30.Mb, 75.40.Cx

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

 
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