Physics – Condensed Matter – Materials Science
Scientific paper
2009-04-20
JPCS 150 (2009) 042111
Physics
Condensed Matter
Materials Science
4 pages, 5 figures, LT25 proceedings
Scientific paper
10.1088/1742-6596/150/4/042111
We have shown that resonant quantum tunnelling of the magnetisation (QTM), until now observed only in 0D cluster systems (SMMs), occurs in the molecular Ising spin chain, CoTAC ([(CH_3)_3NH]CoCl_3 - 2H_2O) which orders as a canted 3D-antiferromagnet at T_C=4.15 K. This effect was observed around a resonant like field value of 1025 Oe. We present here measurements of the relaxation of the 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 a complicated process, whereas, surprisingly, in the case of the ZFC state, the relaxation is exponential.
Khatsko E. N.
Lhotel Elsa
Paulsen Carley
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