Raman-scattering and weak-ferromagnetism studies in Eu{sub 2}CuO{sub 4}
- Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 13083-970 Campinas, Sao Paulo (Brazil)
- San Diego State University, San Diego, California 92182 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
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.}
- OSTI ID:
- 277315
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 2; Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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