1.
Microsc Microanal
; 29(Supplement_1): 1541-1542, 2023 Jul 22.
Artigo
em Inglês
| MEDLINE
| ID: mdl-37613673
2.
Science
; 360(6393): 1101-1104, 2018 06 08.
Artigo
em Inglês
| MEDLINE
| ID: mdl-29880684
RESUMO
Mott insulators are commonly pictured with electrons localized on lattice sites, with their low-energy degrees of freedom involving spins only. Here, we observe emergent charge degrees of freedom in a molecule-based Mott insulator κ-(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.