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Robust Ce3+ valence across the pressure-driven collapse of magnetism in the frustrated Shastry-Sutherland compound Ce2Pd2In

P. Král1,2,3,*, D. Staško1, A. D. Rosa4, E. Mijit5, T. Irifune6, J. Kaštil2, L. Havela1, and J. Prchal1

  • *Contact author: petr.kral@psi.ch
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Phys. Rev. B 114, 094417 – Published 17 August, 2026

DOI: https://doi.org/10.1103/j1v2-4tcg

Abstract

Ce-based intermetallics often display a delicate interplay between magnetism, electron correlations, and lattice geometry, making them highly sensitive to external pressure. We report the evolution of the Ce valence in the frustrated Shastry-Sutherland compound Ce2Pd2In under high pressure using Ce L3-edge x-ray absorption spectroscopy. Although long-range magnetic order collapses around ∼4GPa, the spectra remain dominated by the the Ce 4f1 configuration across this region, pointing to its remarkable stability. Tiny signs of a valence increase appear only above ∼8GPa, well beyond the pressure at which magnetism is suppressed. These observations demonstrate that the collapse of magnetic order is not driven by a valence instability but arises primarily from enhanced geometrical frustration within the Shastry-Sutherland lattice of Ce ions. Ce2Pd2In thus represents a rare realization of a Ce-based intermetallic in which frustration, rather than valence fluctuations, governs the suppression of long-range magnetic order, providing a clean platform to explore exotic ground states in frustrated rare-earth systems.

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Phys. Rev. B 114, 094417– Published 17 August, 2026
  • Received 20 May 2026
  • Revised 22 July 2026
  • Accepted 23 July 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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