Magnetic susceptibility of α and β phases of di[bis(ethylenediothiolo)tetrathiafulvalene] tri-iodide [(BEDT-TTF)2I3] under pressure

摘要: We report static magnetic susceptibility data, $\ensuremath{\chi}(T)$, for the $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ phases of organic conductor di[bis(ethylenediothiolo)tetrathiafulvalene] tri-iodide [${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}$${\mathrm{I}}_{3}$] both at ambient pressure under applied pressures up to 10 kbar. Ambient ESR data below 300 K are also presented. The temperature dependence spin ${\ensuremath{\chi}}_{s}^{\ensuremath{\beta}}(T)$ superconductor $\ensuremath{\beta}$-${(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}$ ${\mathrm{I}}_{3}$ is unusually small conductors; derivative $\ensuremath{\partial}\mathrm{ln}\frac{{\ensuremath{\chi}}_{s}^{\ensuremath{\beta}}}{\ensuremath{\partial}P}$ found be only moderate in magnitude (-3.3% per kbar) independent K. For $\ensuremath{\alpha}$q phase, $\ensuremath{\partial}\mathrm{ln}\frac{{\ensuremath{\chi}}_{s}^{\ensuremath{\alpha}}}{\ensuremath{\partial}P}\ensuremath{\simeq}\ensuremath{-}\frac{2.0%}{\mathrm{Kbar}}$ temperature.