dorsal/arxiv
View SchemaPressure-driven Valence evolution Coupled Hardening-to-Softening transition in YbPd
| Authors | B. Tegomo Chiogo, V. Balédent, J. -P. Rueff, Ethan Saïman, V. Poree, T. Schweitzer, D. Wong, C. Schulz, T. Mazet, A. Chainani, D. Malterre, K. Habicht |
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| Categories | |
| ArXiv ID | 2601.05766vv1 |
| URL | https://arxiv.org/abs/2601.05766 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
We investigate the Yb valence instabilities in the strongly correlated YbPd compound using resonant X-ray emission spectroscopy under pressure across the charge-ordering (CO) transition. At a low temperature (T = 30 K) in the CO ordered phase, the Yb $4f$ valence remains nearly constant up to a pressure P$_K$ = 1.5 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$_K$ = 1.5 GPa. In contrast, for P $>$ P$_K$, the Yb $4f$ valency saturates and the compressibility reveals a counterintuitive pressure-induced softening. The results show a minimum in the compressibility of YbPd (with $f^{13}$-$f^{14}$ hole-type mixed-valence) and is reminiscent of the maximum in compressibility seen in the $\gamma$-$\alpha$ first-order isostructural phase transition in cerium (with $f^{0}$-$f^{1}$ electron-type mixed-valence).
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"abstract": "We investigate the Yb valence instabilities in the strongly correlated YbPd compound using resonant X-ray emission spectroscopy under pressure across the charge-ordering (CO) transition. At a low temperature (T = 30 K) in the CO ordered phase, the Yb $4f$ valence remains nearly constant up to a pressure P$_K$ = 1.5 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$_K$ = 1.5 GPa. In contrast, for P $\u003e$ P$_K$, the Yb $4f$ valency saturates and the compressibility reveals a counterintuitive pressure-induced softening. The results show a minimum in the compressibility of YbPd (with $f^{13}$-$f^{14}$ hole-type mixed-valence) and is reminiscent of the maximum in compressibility seen in the $\\gamma$-$\\alpha$ first-order isostructural phase transition in cerium (with $f^{0}$-$f^{1}$ electron-type mixed-valence).",
"arxiv_id": "2601.05766",
"authors": [
"B. Tegomo Chiogo",
"V. Bal\u00e9dent",
"J. -P. Rueff",
"Ethan Sa\u00efman",
"V. Poree",
"T. Schweitzer",
"D. Wong",
"C. Schulz",
"T. Mazet",
"A. Chainani",
"D. Malterre",
"K. Habicht"
],
"categories": [
"cond-mat.str-el"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Pressure-driven Valence evolution Coupled Hardening-to-Softening transition in YbPd",
"url": "https://arxiv.org/abs/2601.05766",
"version": "v1"
},
"schema_id": "dorsal/arxiv",
"source": {
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"variant": "snapshot-2026-01-17",
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