Multiple, diverse high-pressure measurements were used to study the inhomogeneous mixed valence EuPd3S4.

Under pressure, it exhibits an eight-fold increase of the Néel temperature followed by a structural transition to a lower symmetry structure that coincides with a transition to a fully non-magnetic state.
The phase diagram for EuPd3S4 differs significantly from the proposed global phase diagram for Eu-compounds, emphasizing opportunities Eu-based compounds present for developing new insights into mixed valent behavior.
- Electrical resistance, x-ray diffraction, synchrotron Mossbauer spectroscopy and partial fluorescence-yield x-ray absorption spectroscopy measurements on EuPd3S4 were performed under pressure up to 30-60 GPa.
- Comprehensive temperature - pressure phase diagram was constructed.
Shuyuan Huyan, Dominic H. Ryan, Tyler J. Slade, Barbara Lavina, Greeshma Jose, Haozhe Wang, John M. Wilde, Raquel A. Ribeiro, Jiyong Zhao, Weiwei Xie, Wenli Bi, Esen E. Alp, Sergey L. Bud’ko, Paul C. Canfield, PNAS 120, e2310779120 (2023)