Journal of Low Temperature Physics

, Volume 127, Issue 1–2, pp 51–62 | Cite as

Non-Fermi-Liquid Behavior in CePt1+xSi1−x and CePtSi1−yGey

  • T. Götzfried
  • A. Weber
  • K. Heuser
  • D. Maurer
  • E.-W. Scheidt
  • S. Kehrein
  • G. R. Stewart
Article

Abstract

The heavy-fermion system CePtSi is located close to a magnetic instability. In order to study the influence of composition on the physical properties of CePtSi we prepared slightly off-stoichiometric CePt1+xSi1−x polycrystals. CePt1+xSi1−x with x=−0.04 exhibits typical non-Fermi-liquid behavior (C/T∝lnT, χ∝T−0.21, ρ∝T1.5). A scaling analysis of the thermodynamic quantities at magnetic fields up to 10T and temperatures up to 6K points to a quantum phase transition described by some unknown non-Gaussian fixed point. In contrast substitution of Si by Ge leads to a quantum phase transition involving weak-coupling spin fluctuations for CePtSi0.89Ge0.11, which can be described within the framework of the self-consistent renormalization theory.

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Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • T. Götzfried
    • 1
  • A. Weber
    • 1
  • K. Heuser
    • 1
  • D. Maurer
    • 1
  • E.-W. Scheidt
    • 1
  • S. Kehrein
    • 2
  • G. R. Stewart
    • 3
  1. 1.EP III, Institut für PhysikUniversität AugsburgAugsburgGermany
  2. 2.TP III, Elektronische Korrelationen und Magnetismus, Institut für PhysikUniversität AugsburgAugsburgGermany
  3. 3.Department of PhysicsUniversity of FloridaGainesvilleUSA

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