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Author Alvarenga, A. D. ♦ Rao, D. ♦ Sanjurjo, J. A. ♦ Granado, E. ♦ Torriani, I. ♦ Rettori, C. ♦ Oseroff, S. ♦ Sarrao, J. ♦ Fisk, Z.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ COPPER OXIDES ♦ MAGNETIC PROPERTIES ♦ EUROPIUM OXIDES ♦ CRYSTAL STRUCTURE ♦ FERROMAGNETISM ♦ RAMAN SPECTRA ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE RANGE 0000-0013 K ♦ TEMPERATURE RANGE 0013-0065 K ♦ TEMPERATURE RANGE 0065-0273 K ♦ TEMPERATURE RANGE 0273-0400 K
Abstract We show that there is a subtle instability of the {ital T}{sup {prime}} structure for the {ital R}{sub 2}CuO{sub 4} ({ital R}=rare earth) compounds at the center of the {ital R} series with the boundary at Eu{sub 2}CuO{sub 4}. Crystals grown in Pt crucibles and PbO flux show weak ferromagnetism (WF) and two strongly temperature-dependent forbidden Raman peaks. However crystals grown in alumina crucibles and CuO flux do not show WF and the forbidden Raman peaks are much less intense. The observation of WF and forbidden Raman peaks for Eu{sub 2}CuO{sub 4} compounds suggests that the instability of the {ital T}{sup {prime}} structure may be associated with O(1) displacement in the CuO{sub 2} planes. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-01-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 2


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