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We have shown that resonant quantum tunnelling of the magnetisation (QTM),until now observed only in 0D cluster systems (SMMs), occurs in the molecularIsing spin chain, CoTAC ([(CH_3)_3NH]CoCl_3 - 2H_2O) which orders as a canted3D-antiferromagnet at T_C=4.15 K. This effect was observed around a resonantlike field value of 1025 Oe. We present here measurements of the relaxation ofthe magnetisation as a function of time, from the zero field cooled (ZFC)antiferromagnet state and from the saturated ferromagnet state. We show that,at the resonant field, the relaxation from the saturated state occurs in acomplicated process, whereas, surprisingly, in the case of the ZFC state, therelaxation is exponential.

Relaxation in the 3D ordered CoTAC spin chain by quantum nucleation of 0D domain walls