Temperature dependence of electronic and magnetic properties of (DOEO)_4HgBr_4· TCE single crystals

摘要

The temperature dependence of electronic and magnetic properties of the organic charge- transfer salt (DOEO)_4[HgBr_4]·TCE was investigated using magnetometry. The magnetic susceptibility shows a maximum at 40 K followed by an onset of a pronounced increase at 70 K and a constant behavior above 120 K. Implications on the charge carrier density are discussed. Combining magnetometry with resistivity and ESR measurements we propose a sequence of insulating, metallic and semiconducting behavior with increasing temperature. Our results indicate that (DOEO)_4[HgBr_4]·TCE is close to the boundary between an insulating and conducting ground state.