Anomalous pressure dependence of the bulk modulus and Yb valence in cubic YbPd
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Chiogo, B. Tegomo Balédent, V. Rueff, J. -P. Saïman, E. Poree, V. Schweitzer, T. Wong, D. Schulz, C. Mazet, T. Chainani, A. Malterre, D. Habicht, K. |
| author_facet | Chiogo, B. Tegomo Balédent, V. Rueff, J. -P. Saïman, E. Poree, V. Schweitzer, T. Wong, D. Schulz, C. Mazet, T. Chainani, A. Malterre, D. Habicht, K. |
| contents | 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 = 30 K) in the CO phase, the Yb $4f$ valence remains nearly constant up to a pressure P$_L$ = 1.5 $\pm {0.2}$ GPa, 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 P$_K$ = 1.6 $\pm {0.2}$ GPa. In contrast, for P $>$ P$_K$, 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 $f^{0}$-$f^{1}$ hole-type mixed-valence), reminiscent of the maximum in compressibility seen in the $γ$-$α$ first-order isostructural phase transition in cerium (with $f^{0}$-$f^{1}$ electron-type mixed-valence). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_05766 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anomalous pressure dependence of the bulk modulus and Yb valence in cubic YbPd Chiogo, B. Tegomo Balédent, V. Rueff, J. -P. Saïman, E. Poree, V. Schweitzer, T. Wong, D. Schulz, C. Mazet, T. Chainani, A. Malterre, D. Habicht, K. Strongly Correlated Electrons 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 = 30 K) in the CO phase, the Yb $4f$ valence remains nearly constant up to a pressure P$_L$ = 1.5 $\pm {0.2}$ GPa, 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 P$_K$ = 1.6 $\pm {0.2}$ GPa. In contrast, for P $>$ P$_K$, 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 $f^{0}$-$f^{1}$ hole-type mixed-valence), reminiscent of the maximum in compressibility seen in the $γ$-$α$ first-order isostructural phase transition in cerium (with $f^{0}$-$f^{1}$ electron-type mixed-valence). |
| title | Anomalous pressure dependence of the bulk modulus and Yb valence in cubic YbPd |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.05766 |