engleski

Conduction anisotropy and Hall effect in the organic conductor (TMTTF)_2AsF_6: Evidence for Luttinger liquid behavior and charge ordering

We present the high-temperature (70 K < T < 300 K) resistivity anisotropy and Hall effect measurements of the quasi-one-dimensional (1D) organic conductor (TMTTF)_2AsF_6. The temperature variations of the resistivity are pronouncedly different for the three different directions, with metalliclike at high temperatures for the a axis only. Above 220 K the Hall coefficient R_H is constant, positive, and strongly enhanced over the expected value ; and the corresponding carrier concentration is almost 100 times lower than calculated for one hole/unit cell. Our results give evidence for the existence of a high-temperature regime above 200 K where the 1D Luttinger liquid features appear in the transport properties. Our measurements also give strong evidence of charge ordering in (TMTTF)_2AsF_6. At the charge-ordering transition T_CO = 100 K, R_H(T) abruptly changes its behavior, switches sign, and rapidly increases with further temperature decrease.

organic conductors; transport properties; magnetotransport

Stranice u časopisu glase: 115102-1 - 115102-7.