Long-range magnetic order in Ce(Cu1-xAgx)6

A. K. Gangopadhyay, K. Lettau, C. Lettau, J. S. Schilling, E. Schuberth, W. Fuchs, K. Andres, M. Damento, K. A. Gschneidner

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8 Scopus citations

Abstract

In Ce(Cu1-xAgx)6 new results are reported on the electrical resistivity ρ{variant}(T)(1.3≤T≤300 K) and the lattice parameters at room temperature for x≤0.20, on the heat capacity C(T) (50 mK≤T≤4K) for x = 0.15 and 0.20, and on C(T) (1.5≤T≤20 K) in magnetic fields to 9.8 T for x = 0.1. Sharp anomalies in C(T) for x = 0.15 and 0.20 and in ρ{variant}(T) for x = 0.20 near the magnetic ordering temperatures determined in earlier susceptibility studies confirm the long-range nature of the magnetic transitions in this system. With increasing x the resistivity maximum is shifted to lower temperatures and the lattice expands; it is argued that this volume expansion is primarily responsible for a decrease in the effective Kondo interaction relative to the magnetic exchange interaction between Ce-moments which in turn leads to long-range magnetic order in this system. For x = 0.10 the observed increase in C(T) as a function of magnetic field over the temperature range studied (1.5-20 K) is shown to follow directly from the anticipated behavior of a local-moment system.

Original languageEnglish
Pages (from-to)267-273
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume103
Issue number3
DOIs
StatePublished - 2 Jan 1992
Externally publishedYes

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