Crystal-electric-field excitations and spin dynamics in Ce3Co4Sn13 semimetallic chiral-lattice phase
| Autor: | Kazuya Suyama, Seiko Ohira-Kawamura, Keisuke Tomiyasu, Kazuaki Iwasa, Yuka Otomo, Kenji Nakajima, Jean-Michel Mignot |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Weyl semimetal 02 engineering and technology Electron 021001 nanoscience & nanotechnology 01 natural sciences Inelastic neutron scattering Electrical resistivity and conductivity Electric field Lattice (order) 0103 physical sciences Density of states Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.195156 |
| Popis: | Inelastic neutron scattering experiments have been conducted to investigate the spin dynamics and crystal-electric-field level scheme of the Ce $4f$ electrons in ${\mathrm{Ce}}_{3}{\mathrm{Co}}_{4}{\mathrm{Sn}}_{13}$. This compound exhibits a large specific heat at low temperatures and anomalous semimetallic transport in the chiral crystallographic phase below 160 K. Distinctly observed magnetic excitations at approximately 6 and 29 meV are asymmetric in spectral shape and are reproduced by two inequivalent crystal-electric-field splitting schemes, which are deduced from the chiral structure. We have also observed the spin dynamics reflecting antiferromagnetic correlations below 1 meV, which is enhanced with an upturn in the electrical resistivity below 15 K and which yields a low-energy density of state relevant to the large specific heat. We discuss the possibility of a three-dimensional Weyl semimetal state, considering the chiral-lattice symmetry, electronic hybridization, and magnetic correlation. |
| Databáze: | OpenAIRE |
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