Synchrotron-Mossbauer study of the pressure-driven magnetic evolution in EuGa<sub>4</sub>

Rare-earth Eu compounds represent an intriguing class of magnetic materials that provide a competing playground of Kondo physics, RKKY exchange interactions, and valence evolution. Here, we explore the evolution of antiferromagnetism under pressure via synchrotron-based Mossbauer spectroscopy. Contrary to previous electrical transport results, our observation provides direct evidence of a magnetic ground state at high pressure, continuous through a first order phase transition at 5 GPa and persisting to at least 13.6 GPa. We discuss this result in the framework of a potential interaction between evolution of the valence condition and an increase in the ordering temperature.

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session V07: Kondo and Anderson Lattice Physics

Abstract: V07.00005 : Synchrotron-Mossbauer study of the pressure-driven magnetic evolution in EuGa4

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Abstract: V07.00005 : Synchrotron-Mossbauer study of the pressure-driven magnetic evolution in EuGa₄