Abstract
AbstractStrong 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 on these 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 $$\kappa$$
κ
-(BEDT-TTF)$${}_{2}$$
2
Hg(SCN)$${}_{2}$$
2
Cl enters an insulating “dipole solid” state at $$T=30\,{\mathrm{K}}$$
T
=
30
K
, but below $$T=15\,{\mathrm{K}}$$
T
=
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.
Funder
DOE | Advanced Research Projects Agency - Energy
National Science Foundation
Publisher
Springer Science and Business Media LLC
Subject
Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
16 articles.
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