Evidence for a quantum dipole liquid state in an organic quasi–two-dimensional material

Авторы: Hassan Nora, Cunningham Streit, Mourigal Martin, Zhilyaeva Elena I., Torunova Svetlana A., Lyubovskaya Rimma N., Schlueter John A., Drichko Natalia
Журнал: Science
Том: 360
Номер: 6393
Год издания: 2018
Издательство: American Association for the Advancement of Science
Местоположение издательства: United States
Первая страница: 1101
Последняя страница: 1104
DOI: 10.1126/science.aan6286
Аннотация: Mott insulators are commonly pictured with electrons localized on lattice sites, withtheir low-energy degrees of freedom involving spins only. Here, we observe emergent charge degrees of freedom in a molecule-based Mott insulator k-(BEDT-TTF)2Hg(SCN)2Br, resulting in a quantum dipole liquid state. Electrons localized on molecular dimer lattice sites form electric dipoles that do not order at low temperatures and fluctuate with frequency detected experimentally in our Raman spectroscopy experiments. The heat capacity and Raman scattering response are consistent with a scenario in which the composite spin and electric dipole degrees of freedom remain fluctuating down to the lowest measured temperatures.
Добавил в систему: Жиляева Елена Ивановна

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