Doping effect of magnetic impurities on the spin - Peierls compound p-CyDOV

The magnetic susceptibilities of mixed verdazyl radical crystals, (p-CyDOV) (1-x)(p-CyDTV)(x) (x = 0 similar to 0.07), were measured to study the effec ts of magnetic impurities (p-CyDTV) on the spin-Peierls (SP) transition of p-CyDOV radical crystal, where the > C=O group in p-CyDOV is replaced by th e >C=S group in p-CyDTV. The SP transition temperature (T-SP = 15 K) reduce s rapidly upon p-CyDTV doping and the SP state disappears around x = 0.03. The effect of p-CyDTV substitution was not observed in the X-ray diffractio n pattern of the mixed-radical crystals (x = 0 similar to 0.07). (C) 1999 E lsevier Science B.V. All rights reserved.