Portal de Periódicos da CAPES

Mott Transition in a Valence-Bond Solid Insulator with a Triangular Lattice

2007; American Physical Society; Volume: 99; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.99.256403

1092-0145

Yasuhiro Shimizu, Hikota Akimoto, H. Tsujii, Akiko Tajima, Reìzo Kato,

Magnetism in coordination complexes

We have investigated the Mott transition in a quasi-two-dimensional Mott insulator EtMe{3}P[Pd(dmit){2}]{2} with a spin-frustrated triangular-lattice in hydrostatic pressure and magnetic-field [Et and Me denote C2H5 and CH3, respectively, and Pd(dmit){2} (dmit=1,3-dithiole-2-thione-4,5-dithiolate,dithiolate) is an electron-acceptor molecule]. In the pressure-temperature (P-T) phase diagram, a valence-bond solid phase is found to neighbor the superconductor and metal phases at low temperatures. The profile of the phase diagram is common to those of Mott insulators with antiferromagnetic order. In contrast to the antiferromagnetic Mott insulators, the resistivity in the metallic phase exhibits anomalous temperature dependence, rho=rho{0}+AT(2.5).