Proton-irradiation-induced anomaly in the electrical conductivity of a hydrogen-bonded ferroelastic system

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Se-Hun Kim,^1,2 Kyu Won Lee,¹ Kwang-Sei Lee,³ and Cheol Eui Lee¹
¹Department of Physics and Institute for Nano Science, Korea University, Seoul 136-713, Korea
²Faculty of Science Education, Jeju National University, Jeju 690-756, Korea
³Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University, Gimhae 621-749, Gyeongnam, Korea

Received 21 April 2009; revised 6 August 2009; published 3 November 2009

Ananomalous abrupt drop in the electrical conductivity has been observedat the ferroelastic phase transition of a proton-irradiated system ofhydrogen-bonded TlH₂PO₄. As a result of the high-resolution ³¹P NMRchemical-shift measurements, distinct changes in the atomic displacements due tothe irradiation were identified in the ferroelastic and paraelastic phases.Besides, ¹H NMR spin-spin relaxation measurements revealed a change dueto the irradiation in the proton dynamics at the ferroelasticphase transition, apparently accounting for the much-reduced electrical conductivity inthe paraelastic phase of the irradiated system.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.172101
DOI:	10.1103/PhysRevB.80.172101
PACS:	76.60.-k; 61.80.Lj; 77.90.+k 76.60.-k Nuclear magnetic resonance and relaxation (condensed matter) 61.80.Lj Atom and molecule irradiation effects 77.90.+k Other topics in dielectrics, piezoelectrics, and ferroelectrics and their properties YEAR: 2009
KEYWORDS:	chemical shift, electrical conductivity, ferroelastic transitions, nuclear magnetic resonance, proton effects, spin-spin relaxation, thallium compounds

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