Field-induced spin-density-wave phases in TMTSF organic conductors: Quantization versus nonquantization

Article

关键词: ONE-DIMENSIONAL CONDUCTORS;    MAGNETIC-FIELD;    BECHGAARD SALTS;    ELECTRON-GAS;    THERMODYNAMICS;    STABILITY;    STATES;   

DOI  :  10.1103/PhysRevB.68.094431

来源: SCIE

【 摘 要 】

We study the magnetic-field-induced spin-density-wave (FISDW) phases in TMTSF organic conductors in the framework of the quantized nesting model. In agreement with recent suggestions, we find that the SDW wave vector Q deviates from its quantized value near the transition temperature T-c for all phases with quantum numbers N>0. Deviations from quantization are more pronounced at low pressure and higher N and may lead to a suppression of the first-order transitions N+1-->N for Ngreater than or equal to5. Below a critical pressure, we find that the N=0 phase invades the entire phase diagram in accordance with earlier experiments. We also show that at T=0, the quantization of Q and hence the Hall conductance is always exact. Our results suggest a novel phase transition/crossover at intermediate temperatures between phases with quantized and nonquantized Q.

【 授权许可】

Free