Magnetoresistance Study on TPP[M(Pc)(CN)2]2 (M=Fe, Co, Fe0.30Co0.70) Salts |
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| Authors: | H. Tajima N. HanasakiM. Matsuda F. SakaiT. Naito T. Inabe |
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| Affiliation: | a Institute for Solid State Physics, The University of Tokyo, Kashiwa, 277-8581, Japanb Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan |
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| Abstract: | The magnetoresistance study on TPP[M(Pc)(CN)2]2 (M=Fe, Co, Fe0.30Co0.70) salts is reported. These three salts have similar columnar structures, nevertheless exhibit different electrical behaviors. TPP[Fe(Pc)(CN)2]2 exhibits anisotropic giant negative magnetoresistance, while TPP[Co(Pc)(CN)2] exhibits large positive magnetoresistance. The alloyed compound, TPP[Fe0.30Co0.70 (Pc)(CN)2]2, also exhibits anisotropic negative magnetoresistance, although the decrease in the resistivity under the magnetic field is less than that of TPP[Fe(Pc)(CN)2]2. The g-tensor anisotropy in the [Fe(Pc)(CN)2] unit qualitatively explains the field-orientation dependence of the negative magnetoresistance. Magnetic fluctuation associated with a weak-ferromagnetic transition is suggested as a possible origin of the giant negative magnetoresistance. |
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| Keywords: | negative magnetoresistance phthalocyanine molecular conductors π-d interaction organic conductors charge-transfer complexes. |
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