Melting of charge order in the low-temperature state of an electronic ferroelectric-like systemстатья
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Дата последнего поиска статьи во внешних источниках: 1 июня 2022 г.
Аннотация:Strong electronic interactions can drive a system into a state with a symmetry breaking. Lattice frustration or competing interactions tend to prevent symmetry breaking, leading to quantum disordered phases. In spin systems frustration can produce a spin liquid state. Frustration of a charge degree of freedom also can result in various exotic states, however, experimental data onthese effects is scarce. In this work we demonstrate how in a Mott insulator on a weakly anisotropic triangular lattice a charge ordered state melts on cooling down to low temperatures. Raman scattering spectroscopy finds that κ-(BEDT-TTF)2Hg(SCN)2Cl enters an insulating “dipole solid” state at T ¼ 30 K, but below T ¼ 15 K the order melts, while preserving the insulating energy gap.Based on these observations, we suggest a phase diagram relevant to other quantum paraelectric materials.