Thermal expansion of the magnetically ordering intermetallics RTMg (R = Eu, Gd and T = Ag, Au)
JOURNAL OF PHYSICS-CONDENSED MATTER(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.
MoreTranslated text
Key words
specific heat,magnetic field,thermal expansion,quantum phase transition,phase transition,thermal expansion coefficient
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined