Unconventional spin density wave in (TMTSF)2PF6 below T* ~ 4K

Abstract

The presence of subphases in spin-density wave (SDW) phase of (TMTSF)2PF6 below T* ~ 4K has been suggested by several experiments but the nature of the new phase is still controversial. We have investigated the temperature dependence of the angular dependence of the magnetoresistance in the SDW phase which shows different features for temperatures above and below T*. For T > 4K the magnetoresistance can be understood in terms of the Landau quantization of the quasiparticle spectrum in a magnetic field, where the imperfect nesting plays the crucial role. We propose that below T* ~ 4K the new unconventional SDW (USDW) appears modifying dramatically the quasiparticle spectrum. Unlike conventional SDW the order parameter of USDW depends on the quasiparticle momentum. The present model describes many features of the angular dependence of magnetoresistance reasonably well. Therefore, we may conclude that the subphase in (TMTSF)2PF6 below T* ~ 4K is described as SDW plus USDW.

7 pages, 9 figures, RevTeX4; misprint corrected, references updated, a few sentences added

References in corpus (1)

• Threshold electric field in unconventional density waves

Cited by in corpus (8)

• Electronic crystals: an experimental overview
• Unconventional charge density wave in the organic conductor alpha-(BEDT-TTF)_2KHg(SCN)_4
• Recent Advances in Unconventional Density Waves
• The angular dependent magnetoresistance in alpha-(BEDT-TTF)_2KHg(SCN)_4
• Anisotropy and Field-Dependence of the Spin-Density-Wave Dynamics in the Quasi One-Dimensional Conductor (TMTSF)_2PF_6
• Magnetoresistance in the SDW state of (TMTSF)2PF6 above T*~4K; Novel effect due to the Landau quantization
• Collective modes in unconventional density waves
• Unconventional spin density wave in Bechgaard salt (TMTSF)2NO3