Dielectric measurement study of lamellar CuInP2Se6: successive transitionstowards a ferroelectric state via an incommensurate phase?

Authors
Vysochanskii, YM Molnar, AA Gurzan, MI Cajipe, VB Bourdon, X
Citation
Ym. Vysochanskii et al., Dielectric measurement study of lamellar CuInP2Se6: successive transitionstowards a ferroelectric state via an incommensurate phase?, SOL ST COMM, 115(1), 2000, pp. 13-17
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
115
Issue
1
Year of publication
2000
Pages
13 - 17
Database
ISI
SICI code
0038-1098(2000)115:1<13:DMSOLC>2.0.ZU;2-Q
Abstract
The dielectric properties of lamellar CuInP2Se6 are studied as a function o f temperature. Two phase transitions are detected: a second-order one at T- i = 248 K and a first-order transition at T-c = 236 K. These observations c onfirm the assumed paraelectric and ferroelectric character of the high- an d low-temperature phases and give the first indication of an intermediate d ipole state existing in this material. The hypothesis of an incommensurate phase occurring between T-i and T-c and the possible appearance of a Lifshi tz point in CuInP2(SexS1-x)(6) are discussed. (C) 2000 Published by Elsevie r Science Ltd. All rights reserved.