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Magnetic transitions in a molecular metal with embedded local moments: Cu(pc)I

Authors
Journal
Synthetic Metals
0379-6779
Publisher
Elsevier
Publication Date
Volume
19
Identifiers
DOI: 10.1016/0379-6779(87)90452-8

Abstract

Abstract We discuss the low temperature magnetic properties of (phthalocyaninato)-copper(II) iodide (Cu(pc)I). This molecular metal contains conductive stacks that incorporate a one-dimensional array of local Cu +2 moments strongly coupled to conduction electrons. Below 20K, the EPR g-value of the coupled spin system increases anomalously and at 8K the EPR signal broadens abruptly and becomes unobservable. Anomalies in the proton NMR spin-lattice relaxation times are observed at the transition temperature. Preliminary EPR experiments conducted on a newly synthesized series of materials, Cu xNi 1−x(pc)I, indicate the existence of a similar low temperature transition in the presence of various concentrations of loca moments.

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