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Thermal expansion of the magnetically ordering intermetallics RTMg (R = Eu, Gd and T = Ag, Au) | J. Rohrkamp
; O. Heyer
; T. Fickenscher
; R. Poettgen
; S. Jodlauk
; H. Hartmann
; T. Lorenz
; J.A. Mydosh
; | Date: |
21 Aug 2007 | Abstract: | We report measurements of the thermal expansion for two Eu$^{+2}$- and two
Gd$^{+3}$-based intermetallics which exhibit ferro- or antiferromagnetic phase
transitions. These materials show sharp positive (EuAgMg and GdAuMg) and
negative (EuAuMg and GdAgMg) peaks in the temperature dependence of the thermal
expansion coefficient $alpha$ which become smeared and/or displaced in an
external magnetic field. Together with specific heat data we determine the
initial pressure dependences of the transition temperatures at ambient pressure
using the Ehrenfest or Clausius-Clapeyron relation. We find large pressure
dependences indicating strong spin-phonon coupling, in particular for GdAgMg
and EuAuMg where a quantum phase transition might be reached at moderate
pressures of a few GPa. | Source: | arXiv, 0708.2817 | Services: | Forum | Review | PDF | Favorites |
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