1. Strong enhancement of magnetic ordering temperature and structural/valence transitions in EuPd3S4 under high pressure
- Author
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Huyan, S., Ryan, D. H., Slade, T. J., Lavina, B., Jose, G. C., Wang, H., Wilde, J. M., Ribeiro, R. A., Zhao, J., Xie, W., Bi, W., Alp, E. E., Bud'ko, S. L., and Canfield, P. C.
- Subjects
Condensed Matter - Strongly Correlated Electrons - Abstract
We present a comprehensive study of the mixed valent compound, EuPd3S4, by electrical transport, X-ray diffraction, time-domain 151Eu synchrotron M\"ossbauer spectroscopy, and X-ray absorption spectroscopy measurements under high pressure. The electrical transport measurements show that the antiferromagnetic ordering temperature, TN, increases rapidly from 2.8 K at ambient pressure to 23.5 K at ~19 GPa and plateaus between ~19 and ~29 GPa after which no anomaly associated with TN is detected. A pressure-induced first order structural transition from cubic to tetragonal is observed, with a rather broad coexistence region (~20 GPa to ~32 GPa) that corresponds to the TN plateau. M\"ossbauer spectroscopy measurements show a clear valence transition from approximately 50:50 Eu2+:Eu3+ to fully Eu3+ at ~28 GPa, consistent with the vanishing of the magnetic order at the same pressure. X-ray absorption data show a transition to a fully trivalent state at a similar pressure. Our results show that pressure first greatly enhances TN, most likely via enhanced hybridization between the Eu 4f states and the conduction band, and then, second, causes a structural phase transition that coincides with the conversion of the europium to a fully trivalent state., Comment: 28 pages, 6 figures in main manuscript, 10 figures in SI
- Published
- 2023