Effect of pressure on the spin-Peierls temperature |
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| Institution: | 1. Key Laboratory of Bionic Engineering (Ministry of Education, China), Jilin University, Changchun 130022, PR China;2. Collaborative Innovation Center of Grain Production Capacity Improvement in Heilongjiang Province, PR China |
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| Abstract: | Experiments have shown that a hydrostatic pressure increases the spin-Peierls transition temperature (Tc) in MEM-(TCNQ)2 while a lowering is observed in TTF-CuBDT. A mean field theory, involving an anharmonic coupling between the distortion and the strain and a possibility for both structural and spin-Peierls instabilities is presented. From this theory, we conclude that, depending on the sign of the coupling energy between the dimerization soft mode and the strain, Tc can increase or decrease with pressure. Without this anharmonic coupling, Tc decreases with pressure. |
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