TY - JOUR
T1 - Localization in the peierls gap
AU - Klipstein, P. C.
AU - Friend, R. H.
AU - Yoffe, A. D.
PY - 1985/9
Y1 - 1985/9
N2 - The Peierls instability of a one-dimensional metal to a distortion of the lattice that opens a gap in the electronic spectrum at the Fermi energy, EF, has been extensively investigated in a wide range of low-dimensional conductors in the past decade. This field has provided a very rich range of new physics; these include the varied sequences of incommensurate to commensurate superlattice phase transitions and some new transport phenomena. In this paper we concentrate on one aspect of transport in these systems, the way in which the Peierls mechanism, by reducing the density of states at the Fermi level from a metallic level to a low level, can, in the presence of suitable impurity potentials, allow localization of those remaining carriers, so that conduction is by hopping between these states near the Fermi level. We select two systems of materials to illustrate these processes, the layer structure material 1T-TaS2 and its intercalation complexes with hydrazine, and the conjugated polymers such as polyacetylene. Both these systems can undergo an ‘intercalation’ type of reaction, TaS2 with electron donors (hydrazine), the polymers with both donors and acceptors. In both cases there is a charge transfer reaction, and the Coulomb potential set up by the charged intercalant species, which are present between the host material layers or chains, is of strength appropriate to provide carrier localization and conduction by variable-range hopping.
AB - The Peierls instability of a one-dimensional metal to a distortion of the lattice that opens a gap in the electronic spectrum at the Fermi energy, EF, has been extensively investigated in a wide range of low-dimensional conductors in the past decade. This field has provided a very rich range of new physics; these include the varied sequences of incommensurate to commensurate superlattice phase transitions and some new transport phenomena. In this paper we concentrate on one aspect of transport in these systems, the way in which the Peierls mechanism, by reducing the density of states at the Fermi level from a metallic level to a low level, can, in the presence of suitable impurity potentials, allow localization of those remaining carriers, so that conduction is by hopping between these states near the Fermi level. We select two systems of materials to illustrate these processes, the layer structure material 1T-TaS2 and its intercalation complexes with hydrazine, and the conjugated polymers such as polyacetylene. Both these systems can undergo an ‘intercalation’ type of reaction, TaS2 with electron donors (hydrazine), the polymers with both donors and acceptors. In both cases there is a charge transfer reaction, and the Coulomb potential set up by the charged intercalant species, which are present between the host material layers or chains, is of strength appropriate to provide carrier localization and conduction by variable-range hopping.
UR - http://www.scopus.com/inward/record.url?scp=84912759423&partnerID=8YFLogxK
U2 - 10.1080/13642818508240626
DO - 10.1080/13642818508240626
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AN - SCOPUS:84912759423
SN - 1364-2812
VL - 52
SP - 611
EP - 642
JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
IS - 3
ER -