INFRARED REFLECTION STUDY OF 2-DIMENSIONAL STRUCTURAL PHASE-TRANSITION IN STOICHIOMETRIC PR2NIO4

Authors
LOBO RPSM ALLANCON C DEMBINSKI K ODIER P GERVAIS F
Citation
Rpsm. Lobo et al., INFRARED REFLECTION STUDY OF 2-DIMENSIONAL STRUCTURAL PHASE-TRANSITION IN STOICHIOMETRIC PR2NIO4, Solid state communications, 88(5), 1993, pp. 349-353
Citations number
17
Categorie Soggetti
Physics, Condensed Matter
Journal title
Solid state communications → ACNP
ISSN journal
00381098
Volume
88
Issue
5
Year of publication
1993
Pages
349 - 353
Database
ISI
SICI code
0038-1098(1993)88:5<349:IRSO2S>2.0.ZU;2-F
Abstract
The structural phase transition at 117 K of stoichiometric Pr2NiO4 sin gle crystal has been studied under infrared polarised light, ranging f rom 50 to 5000 cm-1. Our reflectance spectra, obtained between 77 K an d 290 K, allow us to observe the first order character of the Bmab-P4( 2)/ncm phase transition. Moreover, it is shown that this transition do es not have a group-subgroup relation between the phases. Comparing th e spectra on different polarisation directions, we have been able to c onclude for a two-dimensional character of this phase transition.