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Thermodynamic properties of CeCu 6‐x Au x : Fermi‐liquid vs. non‐Fermi‐liquid behaviour
Author(s) -
Finsterbusch D.,
Willig H.,
Wolf B.,
Bruls G.,
Lüthi B.,
Waffenschmidt M.,
Stockert O.,
Schröder A.,
Löhneysen H. V.
Publication year - 1996
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.2065080207
Subject(s) - fermi liquid theory , condensed matter physics , electrical resistivity and conductivity , fermi gamma ray space telescope , magnetization , physics , fermi level , specific heat , fermi gas , materials science , magnetic field , superconductivity , electron , nuclear physics , quantum mechanics
We report on a detailed comparison of the thermodynamic properties of the heavy‐fermion system CeCu 6 which can be described as a Fermi liquid at low temperatures T < 0.1 K, and CeCu 5.9 Au 0.1 where strong deviations from the Fermi‐liquid behaviour were found previously in the T dependence of the specific heat C , magnetization M and electrical resistivity p . The specific heat, magnetization and elastic constants are investigated in a large range of magnetic fields, corroborating the idea that the non‐Fermi‐liquid behaviour arises from low‐lying spin excitations. For the elastic constants, a striking linear T dependence is found for CeCu 5.9 Au 0.1 in contrast to the T 2 Fermi‐liquid behaviour of CeCu 6 .
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