Strong enhancement of magnetic ordering temperature and structural/valence transitions in EuPd 3 S 4 under high pressure
Year: 2023
Type: article
Abstract: We present a comprehensive study of the inhomogeneous mixed-valence compound, EuPd 3 S 4 , by electrical transport, X-ray diffraction, time-domain 151 Eu synchrotron Mössbauer spectroscopy, and X-ray absorption spectroscopy measurements under high pressure. Electrical transport measurements show that the antiferromagnetic ordering temperature, T N , 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 T N is detected. A pressure-induced first-order structural transition from cubic to tetragonal is observed, with a rather broad coexistence region (~20 GPa to ~30 GPa) that corresponds to the T N plateau. Mössbauer spectroscopy measurements show a clear valence transition from approximately 50:50 Eu 2+ :Eu 3+ to fully Eu 3+ 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 T N , most likely via enhanced hybridization between the Eu 4 f 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.
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: National Science Foundation, U.S. Department of Energy, University of Chicago, McGill University, Fonds Québécois de la Recherche sur la Nature et les Technologies, Office of Science, National Nuclear Security Administration, Natural Sciences and Engineering Research Council of Canada, Division of Materials Research, Basic Energy Sciences, Argonne National Laboratory
Awards: G102163711, G1055550527, G107546177, G1286251239, G1313983767, G1418315740, GEOSOILENVIROCARS: A NATIONAL RESOURCE FOR EARTH, PLANETARY, SOIL AND ENVIRONMENTAL SCIENCE RESEARCH AT THE ADVANCED PHOTON SOURCE, G1664757510, G1866217153, G1996433053, G2110534122, G222768804, G2287611682, G2316606464, G2327333655, G2343674527, G2441759041, G249831736, G262962599, G285533474, G3075337988, Consortium for Materials Properties Research in Earth Sciences (COMPRES): National Facilities and Infrastructure Development for High-Pressure Geosciences Research, G3318903820, G3546016435, G3589692066, G3691352189, GEO CARS: A NATIONAL RESOURCE FOR EARTH, PLANETARY AND ENVIRONMENTAL SCIENCE RESEARCH AT THE ADVANCED PHOTON SOURCE, G4155429592, G426311843, G486686280, Facility Support: GeoSoilEnviroCARS: A National Resource for Earth, Planetary, Soil and Environmental Science Research at the APS, G498139845, G513797252, G5387317844, G5648016710, G5959670421, CAREER: TUNING QUANTUM STATES OF MAGNETIC TOPOLOGICAL SYSTEMS WITH PRESSURE, G6671297155, G6848031779, G6918803902, G7088026799, G7471294987, G7583137537, GEOSOILENVIROCARS: A NATIONAL RESOURCE FOR EARTH, PLANETARY, SOIL AND ENVIRONMENTAL SCIENCE RESEARCH AT THE ADVANCED PHOTON SOURCE, G969889393, G993149817
OpenAlex ID: W4389944883