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Titolo:
MU-SR STUDIES OF SPIN EXCITATIONS IN POLYANILINE
Autore:
PRATT FL; VALLADARES RM; PATTENDEN PA; BLUNDELL SJ; HAYES W; MONKMAN AP; NAGAMINE K;
Indirizzi:
UNIV OXFORD,DEPT PHYS,CLARENDON LAB,PARKS RD OXFORD OX1 3PU ENGLAND TOHOKU UNIV,INST MAT RES SENDAI MIYAGI 980 JAPAN UNIV DURHAM,DEPT PHYS DURHAM DH1 3LE ENGLAND UNIV TOKYO,FAC SCI,MESON SCI LAB TOKYO 113 JAPAN
Titolo Testata:
Synthetic metals
fascicolo: 1-3, volume: 69, anno: 1995,
pagine: 231 - 232
SICI:
0379-6779(1995)69:1-3<231:MSOSEI>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
7
Recensione:
Indirizzi per estratti:
Citazione:
F.L. Pratt et al., "MU-SR STUDIES OF SPIN EXCITATIONS IN POLYANILINE", Synthetic metals, 69(1-3), 1995, pp. 231-232

Abstract

Muon techniques have been used to study the spill excitations in polyaniline. The relaxation rate provides information about the spin dynamics. 1D spin diffusion is observed at low temperature in non-metallic materials with a crossover to 2 or 3D behaviour at higher temperature. In metallic polyaniline, in contrast to the undoped cases, the relaxation is rapidly quenched by field at all temperatures. Static and dynamic terms in the relaxation can be separated. The dynamic term shows ahigh field cutoff which occurs around 25 G at 20 K. This relaxation behaviour indicates a broad spectrum of spin fluctuations concentrated at frequencies in the region below 0.3 MHz. This is a frequency regionthat is somewhat lower than previously studied by other probes of spin dynamics.

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Documento generato il 02/12/20 alle ore 15:25:59