The pressure-temperature phase diagram of the organic superconductor bis-tetramethyltetraselenafulvalenium hexafluorophosphate [(TMTSF)₂{PF}₆$] has been carefully measured by electron-spin resonance is a single crystal at low magnetic fields. We present the first microscopic evidence for the transition from the spin-density-wave state to superconductivity as the temperature is lowered at constant pressure. Comparison is made with recent theoretical calculations on the competition between spin-densitywave and superconducting ground states.
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Azevedo et al. (1984) studied this question.
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