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Scientific article
English

High pressure electrical resistivity and specific heat of the heavy fermion compound CeCoGe2.2Si0.8

Contributors

Larrea, J.; Teyssier, Jérémie; Rϕnnow, H. M.; Lorenzer, K.-A.; Paschen, S.

Published in

Physica status solidi. B, Basic research, vol. 250, no. 3, p. 511-514

Publication date

2013

Abstract

We study the evolution of the magnetic ground state close to the putative quantum critical point in CeCoGe2.2Si0.8 by using electrical resistivity and specific heat measurements under the same high hydrostatic pressure conditions. The electrical resistivity shows that the antiferromagnetic ordering temperature, TN, is suppressed above PC = 5.9 kbar, with the emergence of non-Fermi liquid behavior. On the other hand, the specific heat shows two different magnetic transitions at 0 kbar, one at TN and another one at Tl ≈ 0.3 K. Both transition temperatures are reduced by pressure but remain finite up to at least 7.2 kbar. The height of the specific heat anomaly at TN, ΔCN, is strongly reduced above PC. These features suggest that the quantum criticality in CeCoGe2.2Si0.8 is governed by disorder.

Keywords

  • Disorder
  • Heavy fermions
  • High pressure
  • Quantum phase transitions
  • Specific heat

UNIGE affiliation entities

Citation (ISO format)

LARREA, J. et al. High pressure electrical resistivity and specific heat of the heavy fermion compound CeCoGe2.2Si0.8. In: Physica status solidi. B, Basic research, 2013, vol. 250, n° 3, p. 511–514. doi: 10.1002/pssb.201200761

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Article (Published version)

Identifiers

Journal ISSN

0370-1972
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Technical informations

Creation

22/04/2014 09:14:00

First validation

22/04/2014 09:14:00

Update

14/03/2023 21:08:59

Status update

14/03/2023 21:08:59

Last indexation

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