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Pressure-Induced Sequential Magnetic Pole Inversion and Antiferromagnetic−Ferromagnetic Crossover in a Trimetallic Prussian Blue Analogue

2006; American Chemical Society; Volume: 128; Issue: 18 Linguagem: Inglês

10.1021/ja061514m

1943-2984

Lindsay Egan, Konstantin V. Kamenev, Dionisis Papanikolaou, Yasuhiro Takabayashi, Serena Margadonna,

Organic and Molecular Conductors Research

The flexibility of the structure of Prussian blue analogues and its ability to incorporate a variety of competing magnetic interactions have allowed the design of mixed ferro-ferrimagnets, which span the whole spectrum of magnetic behavior, including the rare phenomenon of magnetization reversal in response to a change in temperature. Hydrostatic pressure is used here to induce multiple reversals of the direction of the spontaneous magnetization in the trimetallic Prussian blue analogue, Rb0.64Ni0.31Mn0.87[Fe(CN)6]·2.8H2O. Remarkably, the magnetic response is extremely sensitive to pressure, and the magnetization flips from positive to negative and back to positive in a very narrow pressure range (0 < P < 0.6 kbar). A further increase in pressure to 4.0 kbar induces an internal redox reaction, and the magnetic order switches from ferrimagnetic to bulk ferromagnetism.