Anisotropic giant magnetoresistance originating from the π-d interaction in a molecule |
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| Authors: | M Matsuda H Tajima T Naito |
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| Institution: | a The Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa 277-8581, Japan
b Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan |
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| Abstract: | We synthesized TPPFeIII(Pc)(CN)2]2, PTMAxFeIII(Pc)(CN)2]·y(MeCN), and PXX FeIII(Pc)(CN)2], a new series of charge-transfer salts containing the axially-substituted phthalocyanine (Pc), FeIII(Pc)(CN)2]−. In this molecular unit, the π conduction electron derived from the Pc-ring coexists with the d electron which is a potential source of a local magnetic moment. Therefore various phenomena associated with the interplay between local magnetic moments and conduction electrons are expected. We observed the giant negative magnetoresistance (GNMR) in all the three salts. The GNMR is highly anisotropic for the magnetic-field direction, and reflects the g-tensor anisotropy of the local magnetic moment in the FeIII(Pc)(CN)2]− unit. This indicates that the GNMR in these salts originates from the strong π-d interaction in the FeIII(Pc)(CN)2]− unit. |
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