A. Mrzel et al., INTERPLAY BETWEEN ANTIFERROMAGNETIC AND FERROMAGNETIC PHASES OF TDAE-C-60 - AN ESR STUDY OF HIGH-TEMPERATURE ANNEALED SAMPLES, Physical review. B, Condensed matter, 53(6), 1996, pp. 2922-2925
The low-temperature magnetic properties of annealed TDAE-C-60 single c
rystals are studied with electron spin resonance. Whereas freshly grow
n single crystals are found to order antiferromagnetically at low temp
erature, annealing at room temperature and above results in an enhance
d ferromagnetic ordering and three separate magnetic phases can be ide
ntified below 25 K, below 16 K, and below 10 K. The orientational orde
ring transition temperature T-0 is found to be correlated with the ann
ealing temperature T-a and the drop in susceptibility which is systema
tically observed below 100 K is interpreted as the onset of antiferrom
agnetic correlations.