Low-temperature diffuse X-ray studies of charge-density waves coexisting with spin-density waves in the organic conductors (TMTSF) 2PF 6 and (TMTSF) 2AsF 6

Abstract

The behaviors of 2 k F and 4 k F charge-density waves (CDWs) coexisting with spin-density waves (SDWs) in the title compounds were studied by diffuse X-ray scattering down to 1.6 K. It was found in the PF 6 compound that CDWs disappear below 3–4 K while they are present in the temperature range between 4 and 12 K, the SDW onset temperature. This behavior is possibly related to the subphase structure of SDW. In the AsF 6 compound, the amplitude of CDW is very small, which is related to the difference between the heat capacities of these two compounds observed previously.