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arXiv · 2505.03249

Multilayer Crystal Field states from locally broken centrosymmetry

Owen Moulding·Makoto Shimizu·Amit Pawbake·Yingzheng Gao·Sitaram Ramakrishnan·Gaston Garbarino·Nubia Caroca-Canales·Jérôme Debray·Clément Faugeras·Christoph Geibel·Youichi Yanase·Marie-Aude Méasson
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Abstract

Local charge, spin, or orbital degrees of freedom with intersite interactions are oftentimes sufficient to construct most quantum orders. This is conventionally true for f-electron systems, where the extent of the f-electrons and their associated crystal-electric-field (CEF) states are strongly localized. Here, polarized Raman spectroscopy measurements of a locally non-centrosymmetric compound, CeCoSi, unveil more CEF excitations than expected in the local model. We interpret this as experimental evidence for the entanglement of CEF states between cerium layers. This composite sublattice, spin, and orbital degree of freedom provides an unconsidered means to form novel orders, not only in this system, but in any system exhibiting globally preserved yet locally broken centrosymmetry.

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Owen Moulding, Makoto Shimizu, Amit Pawbake, Yingzheng Gao, Sitaram Ramakrishnan, Gaston Garbarino, Nubia Caroca-Canales, Jérôme Debray, Clément Faugeras, Christoph Geibel, Youichi Yanase, Marie-Aude Méasson. 2025-05-06. Multilayer Crystal Field states from locally broken centrosymmetry. https://arxiv.org/abs/2505.03249

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