Abstract
The low-frequency electron spin resonance (ESR) under hydrostatic pressure has been studied in the soft-ferromagnet TDAE-C 60 , where TDAE is tetrakis-dimethylamino-ethylene. A demagnetising field causes ESR line shift proportional to the spontaneous magnetisation. The pressure dependence of T C deduced from the ESR line shift is found to follow a relationship of T C (P) T C (0)[1 - (P/P C ) 2 ], where T C 16 K and P C 9 kbar. The antiferro-orbital-ordering model of Jahn-Teller distorted C 60 - is investigated as a possible mechanism for the ferromagnetism. With the realistic magnitudes of parameters a prediction of this model is in good quantitative agreement with the data. The pressure above 10 kbar promotes an irreversible phase change; a reduced lattice constant along c-axis, a reduced ESR line width, an increased number of spins and an increased g-shift. From the c-lattice constant of 9.17±0.07 A, we concluded that a new β-phase induced by pressure is a [2+2] cycloadditive 1D polymer phase, where the spin revives on TDAE + , missing in the ferromagnetic α-phase.
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