Tamura M, Kato R. Variety of valence bond states formed of frustrated spins on triangular lattices based on a two-level system Pd(dmit)
2.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2009;
10:024304. [PMID:
27877277 PMCID:
PMC5090434 DOI:
10.1088/1468-6996/10/2/024304]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Revised: 07/06/2009] [Accepted: 11/04/2008] [Indexed: 05/30/2023]
Abstract
Recent studies on the physical properties of the triangular system based on the Pd(dmit)2 salts (dmit=1,3-dithiole-2-thione-4,5-dithiolate) are reviewed. Quantum chemical architectures of the Pd(dmit)2 molecule and its dimer are introduced with emphasis on the strong dimerization of a two-level system, which provides unique physical properties of the salts. The magnetic properties are outlined in view of the magneto-structural correlation specific to the frustrated spin systems. Some newly discovered ground states and their origins are discussed, for which the valence bond formation plays a key role. Among them, the two-level structure is crucial for the novel charge-separated state found in two salts. The valence bond ordering, similar to the spin-Peierls transition, has been found in a two-dimensional frustrated spin system. The physical aspects and possible relation to the pressure-induced superconductivity are discussed.
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