High pressure electrical resistivity and specific heat of the heavy fermion compound CeCoGe2.2Si0.8. Issue 3 (19th February 2013)

• Record Type: Journal Article
• Authors: Larrea J., J.; Teyssier, J.; Rϕnnow, H. M.; Lorenzer, K.‐A.; Paschen, S.
• Is Part Of: Physica status solidi. Volume 250:Issue 3(2013:Mar.)
• Page Start: 511
• Page End: 514
• Publication Date: 2013-02-19
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201200761
• Languages: English
• ISSNs: 0370-1972

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We study the evolution of the magnetic ground state close to the putative quantum critical point in CeCoGe_2.2Si_0.8 by using electrical resistivity and specific heat measurements under the same high hydrostatic pressure conditions. The electrical resistivity shows that the antiferromagnetic ordering temperature, <italic>T</italic>_N, is suppressed above <italic>P</italic>_C = 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 <italic>T</italic>_N and another one at <italic>T</italic>_l <italic>≈</italic> 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 <italic>T</italic>_N, Δ<italic>C</italic>_N, is strongly reduced above <italic>P</italic>_C. These features suggest that the quantum criticality in CeCoGe_2.2Si_0.8 is governed by disorder.</p> </abstract>