Magnetic susceptibility ofαandβphases of di[bis(ethylenediothiolo)tetrathiafulvalene] tri-iodide [(BEDT−TTF)2I3] under pressure

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Abstract

We report static magnetic susceptibility data, $\ensuremath{\chi}(T)$, for the $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ phases of the 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 and under applied pressures of up to 10 kbar. Ambient pressure ESR data for both phases below 300 K are also presented. The temperature dependence of the spin susceptibility ${\ensuremath{\chi}}_{s}^{\ensuremath{\beta}}(T)$ for the 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 for organic conductors; the pressure derivative $\ensuremath{\partial}\mathrm{ln}\frac{{\ensuremath{\chi}}_{s}^{\ensuremath{\beta}}}{\ensuremath{\partial}P}$ is found to be only moderate in magnitude (-3.3% per kbar) and independent of temperature below 300 K. For the $\ensuremath{\alpha}$q phase, $\ensuremath{\partial}\mathrm{ln}\frac{{\ensuremath{\chi}}_{s}^{\ensuremath{\alpha}}}{\ensuremath{\partial}P}\ensuremath{\simeq}\ensuremath{-}\frac{2.0%}{\mathrm{Kbar}}$ at ambient temperature.

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