Multilayer Crystal Field states from locally broken centrosymmetry
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.
Keywords
Cite
@article{arxiv.2505.03249,
title = {Multilayer Crystal Field states from locally broken centrosymmetry},
author = {Owen Moulding and Makoto Shimizu and Amit Pawbake and Yingzheng Gao and Sitaram Ramakrishnan and Gaston Garbarino and Nubia Caroca-Canales and Jérôme Debray and Clément Faugeras and Christoph Geibel and Youichi Yanase and Marie-Aude Méasson},
journal= {arXiv preprint arXiv:2505.03249},
year = {2025}
}
Comments
17 pages, plus SI, 3 figures