Field-induced spin-density-wave phases in TMTSF organic conductors: quantization versus non-quantization

Abstract

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 $\mathbf{Q}$ 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 $N+1\to N$ for $N\ge 5$. 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 $\mathbf{Q}$ and hence the Hall conductance is always exact. Our results suggest a novel phase transition/crossover at intermediate temperatures between phases with quantized and non-quantized $\mathbf{Q}$.

arXiv comment4 pages, 4 figures, Revtex

References in corpus (4)

• Field-Induced Spin-Density-Wave Phases in Quasi-One-Dimensional Conductors: Theory versus Experiment
• Novel Phases in the Field Induced Spin Density Wave State in (TMTSF)_2PF_6
• Sign reversals of the quantum Hall effect and helicoidal magnetic-field-induced spin-density waves in quasi-one-dimensional organic conductors
• Edge electron states for quasi-one-dimensional organic conductors in the magnetic-field-induced spin-density-wave phases