Naslov
Unconventional spin density wave in (TMTSF)(2)PF6 below T-star approximate to 4 K

Autori
Basletić, Mario ; Korin-Hamzić, Bojana ; Maki, Kazumi

Izvornik
Physical review. B, Condensed matter and materials physics (1098-0121) 65 (2002), 23; 235117, 7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
angular-dependence ; charge-density ; magnetoresistance ; state ; phase ; thermodynamics ; conductivity ; (tmtsf)2pf6 ; salts

Sažetak
The presence of subphases in spin-density wave (SDW) phase of (TMTSF)_2PF_6 below T* \approx 4 K 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* \approx 4 K. For T > 4 K 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* \approx 4 K the new unconventional SDW (USDW) appears modifying dramatically the quasiparticle spectrum. Unlike conventional SDW the order parameter of USDW depends on the quasiparticle momentum $\Delta_1(\mvk)\propto \cos 2bk_y$. 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 \approx 4 K is described as SDW plus USDW.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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