TY - JOUR
T1 - Nickel phthalocyanine iodide
T2 - A highly-one-dimensional low-temperature molecular metal
AU - Martinsen, Jens
AU - Palmer, Sharon M.
AU - Tanaka, Jiro
AU - Greene, Richard C.
AU - Hoffman, Brian M.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1984
Y1 - 1984
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000575789&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000575789&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.30.6269
DO - 10.1103/PhysRevB.30.6269
M3 - Article
AN - SCOPUS:0000575789
SN - 0163-1829
VL - 30
SP - 6269
EP - 6276
JO - Physical Review B
JF - Physical Review B
IS - 11
ER -