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MeSb[Pd(dmit)] studied by 
SRKawamura, Seiko; Guerin, L.*; Watanabe, Isao*; Kato, Reizo*
no journal, ,
Anion radical salt 
[Pd(dmit)] ( is a counter cation) has a two-dimensional isotropic/distorted triangular lattice structure formed by Pd(dmit) dimers. Spin-1/2 is localized at each dimer in an insulating phase. One of them, EtMeSb[Pd(dmit)], has been suggested to exhibit an isotropic triangular lattice structure and to occur a first-order transition to charge separation accompanying with formation of spin-singlet state at 
= 70 K. We have obtained the evidence for the appearance of the spin-singlet state from previous muon spin relaxation (SR) measurements on this system. However, the temperature at which the muon spin relaxation rate shows an anomaly was slightly different from suggested one. Recently, a high-resolution X-ray structure analysis reported that this system exhibits an incommensurate structure phase below 
= 105 K and a commensurate charge separation phase below 
= 66.5 K. We performed additional SR study, and observed a slight increase in dynamical component below and an obvious enhancement of the dynamical fluctuation below .
MeSb[Pd(dmit)] studied by SRKawamura, Seiko; Guerin, L.*; Watanabe, Isao*; Kato, Reizo*
no journal, ,
Molecule-based organic conductor EtMeSb[Pd(dmit)] is a two-dimensional triangular lattice system with spin-1/2. The system is suggested to undergo a first order transition to a charge separation (CS) phase with formation of a spin-singlet state at = 70 K. Recently, it was found by a high-resolution X-ray diffraction measurement that an intermediate incommensurate phase, where the degree of spatial distortion of the triangular lattice is modulated, appears below = 105 K and then the commensurate CS phase appears below = 66.5 K. We performed SR measurements on this system to investigate magnetic dynamics in the incommensurate and commensurate phases. A small enhancement of the muon spin relaxation was observed below , in addition to a drastic increase in the muon spin relaxation rate below . Our result may indicate that the magnetic correlation significantly coupled with the lattice structure changes at .