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Magnetic properties of fluoro-aluminum phthalocyanine (AlPcF) film doped with tetracyanoethylene (TCNE) are studied by ESR. A strong pressure dependence is observed: At 760 Torr an antiferromagnetic transition takes place at 175±3 K, while, in vacuum, no magnetic transition is observed. DC conductivity does not have any pressure dependence. An X-ray diffraction study indicates that a pressure dependence of interlayer distance inside the film is a structural origin of the pressure dependence of the magnetism. A resonance mechanism of a charge transfer between AlPcF cation radical (AlPcF + ·) and TCNE anion radical (TCNE - ·) is proposed in order to explain an interchain magnetic coupling.
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Hiromitsu et al. (1990) studied this question.
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