Journal
PHYSICAL REVIEW B
Volume 97, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.245134
Keywords
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Funding
- Croatian Science Foundation [IP-2013-11-1011, IP-2016-06-1142]
- Deutsche Forschungsgemeinschaft (DFG)
- H2020 CSA Twinning Project [692194]
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The Mott insulator beta'-EtMe3Sb[Pd(dmit)(2)](2) belongs to a class of charge transfer solids with highly frustrated triangular lattice of S = 1/2 molecular dimers and a quantum-spin-liquid ground state. Our experimental and ab initio theoretical studies show the fingerprints of strong correlations and disorder, the important role of cation-dimer bonding in charge redistribution, no sign of intra-and interdimer dipoles, and the decisive van der Waals contribution to interdimer interactions and the ground-state structure. The latter consists of quasidegenerate electronic states related to the different configurations of cation moieties, which permit two different equally probable orientations. Upon reducing the temperature, the low-energy excitations slow down, indicating glassy signatures as the cation motion freezes out.
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