Nickel phthalocyanine iodide: A highly-one-dimensional low-temperature molecular metal

Jens Martinsen*, Sharon M. Palmer, Jiro Tanaka, Richard C. Greene, Brian M Hoffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

The conductivity of the linear-chain molecular-metal phthalocyanatonickel(II)iodide [Ni(pc)I] remains metallic down to 30 K, goes through a weak maximum, and then levels off to a high asymptotic (T0) value that varies from to 2 times the value at room temperature (500 -1 cm-1). The full characterization of this compound, reported here, includes a thermoelectric power linearly proportional to T, a Pauli-like static and EPR magnetic susceptibility, and single-crystal reflectivity spectra exhibiting a plasma edge for light polarized parallel to the conducting axis. The results confirm that this compound possesses all the characteristics of molecular metal that retains a metallic band structure down to a temperature below 2 K. However, Ni(pc)I does not possess any strong interstack interactions of the type necessary to suppress a Peierls metal-nonmetal transition via an increase in the dimensionality, and should be classified as one of the most one-dimensional molecular metals studied to date. A structurally imposed weakening of the interstack Coulomb interactions, coupled with weak random potentials from structurally disordered triiodide chains, is apparently sufficient to suppress the three-dimensional transition normally associated with the tendency of an anisotropic conductor to undergo a Peierls distortion.

Original languageEnglish (US)
Pages (from-to)6269-6276
Number of pages8
JournalPhysical Review B
Volume30
Issue number11
DOIs
StatePublished - Jan 1 1984

ASJC Scopus subject areas

  • Condensed Matter Physics

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