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

关键词: Pd(dmit)2 salts;    triangular lattice;    antiferromagnets;    frustration;    HOMO-LUMO interplay;    spin gap;    superconductivity;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown