Spin excitations of a quantum liquid of octupoles
Our recent measurements on the pyrochlore magnet Ce2Sn2O7 demonstrate that a quantum liquid of magnetic octupoles develops below about 1 K in this material. This exotic state is qualitatively new - at least experimentally - and was revealed by experiments using thermal neutrons, in which a liquid-like signal appears at high momentum transfer due to the peculiar form factor of higher-rank multipoles. Our current understanding of this remarkable phase of matter is that spin excitations have a dipolar character and thus should be measurable using cold neutron inelastic spectroscopy. This indeed appears to be the case based on a short test experiment on IN5, which we need to extend by measurements at several temperatures. We propose to measure the excitation spectrum of Ce2Sn2O7 using IN5. We expect these results will complement our existing data and contribute to an important discovery.
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Romain Sibille; FENNELL Tom; LHOTEL Elsa; OLLIVIER Jacques; PETIT Sylvain and POREE Victor. (2020). Spin excitations of a quantum liquid of octupoles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-770
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