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Anomalous pressure dependence of the bulk modulus and Yb valence in cubic YbPd

B. Tegomo Chiogo1,*, V. Balédent2,3, J.-P. Rueff4,5, E. Saïman2, V. Poree4,6, T. Schweitzer7, D. Wong1, C. Schulz1, T. Mazet7 et al.

A. Chainani8, D. Malterre7, and K. Habicht1,9

  • *Contact author: bodry.tegomo_chiogo@helmholtz-berlin.de
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Phys. Rev. Research 8, 033055 – Published 13 July, 2026

DOI: https://doi.org/10.1103/ftks-31jr

Abstract

We investigate the Yb valence instabilities in the strongly correlated YbPd compound using resonant x-ray emission spectroscopy as a function of pressure across the charge-order (CO) transition. At a low temperature (T=30K) in the CO phase, the Yb 4f valence remains nearly constant up to a pressure PL=1.5 ±0.2GPa, and then increases gradually at higher pressures. In contrast, at room temperature in the normal phase, an anomalous decrease of the Yb 4f valence is observed, without any accompanying structural phase transition. This behavior is corroborated by a systematic pressure-dependent decrease of the unit-cell volume. Based on a Birch-Murnaghan analysis, the compressibility indicates hardening of the lattice with applied pressure up to a distinct kink seen at PK=1.6 ±0.2GPa. In contrast, for P > PK, the Yb 4f valence saturates, and the compressibility reveals a counterintuitive pressure-induced softening. The results show a minimum in the compressibility of YbPd (with f0–f1 hole-type mixed valence), reminiscent of the maximum in compressibility seen in the γ–α first-order isostructural phase transition in cerium (with f0–f1 electron-type mixed valence).

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Phys. Rev. Research 8, 033055– Published 13 July, 2026
  • Received 1 February 2026
  • Accepted 4 June 2026
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