Abstract
The dependence of the Curie temperature on hydrostatic pressure has been determined to 21 kbar for the ferromagnetic molecular magnet (Mn(OC 14H 29) 4(TCNE), where Mn III-ions are situated in ferrimagnetic porphyrin chains separated by 31.2 A ̊ . In the present experiments both He-gas and piston-cylinder pressure systems are used to 6 and 21 kbar, respectively. Following an initial rapid decrease of the Curie temperature T c with applied pressure from 20 to 15 K at 1.5 kbar, T c abruptly begins to increase with pressure at an equally rapid rate, ultimately reaching nearly 37 K at 21 kbar. The change in the sign in d T c/d P at 1.5 kbar is likely the result of a phase transition in the spin and/or lattice system. The possible role of dipolar interactions in determining the magnetic state in a system of parallel ferrimagnetic chains is discussed.
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