Reduced intrachain spin diffusion in trans-polyacetylene due to sp3 orbital defects

Yue Cao; James R. Gaines; A. J. Epstein; G. Arbuckle; A. G. MacDiarmid

doi:10.1103/PhysRevB.40.3176

Reduced intrachain spin diffusion in trans-polyacetylene due to sp3 orbital defects

Yue Cao, James R. Gaines, A. J. Epstein, G. Arbuckle, A. G. MacDiarmid

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Abstract

Samples of trans-polyacetylene, modified with deuterium in such a way as to produce sp3 orbital defects, have been studied by EPR and NMR techniques. Both the EPR linewidth and the NMR spin-lattice relaxation time are found to be temperature dependent for all the samples. Moreover, the EPR lines are motionally narrowed and the NMR relaxation time is relatively short, indicative of soliton spin motion. The temperature dependence of the soliton diffusion rate is extracted from the data. A simple model to explain the nuclear relaxation rate is proposed. The sp3 orbitals reduce the intrachain diffusion of solitons by 2 orders of magnitude, so that one-dimensional behavior is no longer observed.

Original language	English (US)
Pages (from-to)	3176-3181
Number of pages	6
Journal	Physical Review B
Volume	40
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.40.3176
State	Published - 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1103/PhysRevB.40.3176

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title = "Reduced intrachain spin diffusion in trans-polyacetylene due to sp3 orbital defects",

abstract = "Samples of trans-polyacetylene, modified with deuterium in such a way as to produce sp3 orbital defects, have been studied by EPR and NMR techniques. Both the EPR linewidth and the NMR spin-lattice relaxation time are found to be temperature dependent for all the samples. Moreover, the EPR lines are motionally narrowed and the NMR relaxation time is relatively short, indicative of soliton spin motion. The temperature dependence of the soliton diffusion rate is extracted from the data. A simple model to explain the nuclear relaxation rate is proposed. The sp3 orbitals reduce the intrachain diffusion of solitons by 2 orders of magnitude, so that one-dimensional behavior is no longer observed.",

author = "Yue Cao and Gaines, {James R.} and Epstein, {A. J.} and G. Arbuckle and MacDiarmid, {A. G.}",

year = "1989",

doi = "10.1103/PhysRevB.40.3176",

language = "English (US)",

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T1 - Reduced intrachain spin diffusion in trans-polyacetylene due to sp3 orbital defects

AU - Cao, Yue

AU - Gaines, James R.

AU - Epstein, A. J.

AU - Arbuckle, G.

AU - MacDiarmid, A. G.

PY - 1989

Y1 - 1989

N2 - Samples of trans-polyacetylene, modified with deuterium in such a way as to produce sp3 orbital defects, have been studied by EPR and NMR techniques. Both the EPR linewidth and the NMR spin-lattice relaxation time are found to be temperature dependent for all the samples. Moreover, the EPR lines are motionally narrowed and the NMR relaxation time is relatively short, indicative of soliton spin motion. The temperature dependence of the soliton diffusion rate is extracted from the data. A simple model to explain the nuclear relaxation rate is proposed. The sp3 orbitals reduce the intrachain diffusion of solitons by 2 orders of magnitude, so that one-dimensional behavior is no longer observed.

AB - Samples of trans-polyacetylene, modified with deuterium in such a way as to produce sp3 orbital defects, have been studied by EPR and NMR techniques. Both the EPR linewidth and the NMR spin-lattice relaxation time are found to be temperature dependent for all the samples. Moreover, the EPR lines are motionally narrowed and the NMR relaxation time is relatively short, indicative of soliton spin motion. The temperature dependence of the soliton diffusion rate is extracted from the data. A simple model to explain the nuclear relaxation rate is proposed. The sp3 orbitals reduce the intrachain diffusion of solitons by 2 orders of magnitude, so that one-dimensional behavior is no longer observed.

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Reduced intrachain spin diffusion in trans-polyacetylene due to sp3 orbital defects

Abstract

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