Two magnetic Gruumlneisen parameters in the ferromagnetic superconductor UGe2

Andrew Huxley, Frédéric Hardy, C Meingast, V Taufour, Jacques Flouquet, Hilbert von Lohneysen, R.A. Fisher, Norman Phillips, Jason Lashley

Research output: Contribution to journalArticlepeer-review

Abstract

We report ambient-pressure magnetization, heat capacity, and thermal-expansion measurements of the ferromagnetic superconductor UGe2 in high magnetic fields. An analysis of the magnetic heat capacity derived from both magnetization and specific-heat data shows that UGe2 is well described in the framework of the molecular-field theory. Our heat-capacity and thermal-expansion results reveal a clear crossover regime, a feature that illustrates the proximity to the quantum critical end point of a first-order boundary between two different ferromagnetic phases. Furthermore, we show that the ferromagnetic contribution to these thermodynamic quantities can be split into two terms with distinct Gruumlneisen parameters.
Original languageEnglish
Pages (from-to)174521
JournalPhysical review B: Condensed matter and materials physics
Volume80
Publication statusPublished - Nov 2009

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