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- W2003996719 abstract "X-ray investigation of θ-BEDT-TTF 2 RbZn(SCN) 4 was carried out around the temperature of the phase transition to the nonmagnetic state. θ-BEDT-TTF 2 RbZn(SCN) 4 exhibits a metal–insulator transition accompanied by a charge ordering at T CO =200 K. In the one-dimensional spin chain formed by this charge ordering, BEDT-TTF donor molecules are aligned uniformly along the a -axis obeying the 2 1 screw symmetry of the space group P 2 1 2 1 2 1 below T CO . At the ground state, the system becomes nonmagnetic. The transition temperature T c to the nonmagnetic phase seems to scatter around 20 K and may depend on the sample. We found that the extinction rule of [ h 00: h =2 n ] no longer applied below approximately 20 K. This indicated a symmetry breaking of the 2 1 screw symmetry along the a -axis in the nonmagnetic state. The observed peak intensities violating the extinction rule were about 10 -4 of other general Bragg reflection peak intensities. This structural change should be interpreted as a spin-Peierls transition in the charge-ordered system. In addition, a corresponding anomaly was observed in the lattice parameter a ." @default.
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- W2003996719 date "2007-12-15" @default.
- W2003996719 modified "2023-09-30" @default.
- W2003996719 title "Spin-Peierls Transition in the Charge-Ordered Organic Conductor θ-BEDT-TTF2RbZn(SCN)4" @default.
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- W2003996719 doi "https://doi.org/10.1143/jpsj.76.124602" @default.
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