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Type: Artigo de periódico
Title: Weak ferromagnetism above T-N in Gd2CuO4
Author: Martinho, H
Martin, AA
Moreno, NO
Sanjurjo, JA
Rettori, C
Oseroff, SB
Fisk, Z
Pagliuso, PG
Sarrao, JL
Abstract: In this work we report magnetization and Raman measurements performed in single crystals of Gd2CuO4. The data show the presence of two forbidden Raman modes (fRm), B-1g(*) and B-2g(*), and weak ferromagnetism (WF) in the CuO2 planes up to temperatures well above T(N)(Cu)similar to 280 K. We have studied the T-dependence of the intensity of these fRm and the WF component between 2 and 800 K. The WF component and the relative intensity of the two fRm decrease with increasing T and they vanish at T similar to 650 and 520 K, respectively. Recent neutron diffraction experiments observed a tetragonal to orthorhombic phase transition at T congruent to 650 K. These results are interpreted in terms of structural distortions within the CuO2 planes that lead to the existence of a distribution of coexisting tetragonal and orthorhombic crystallographic domains in this system. (C) 2001 Elsevier Science B.V. All rights reserved.
Subject: weak ferromagnetism
Raman spectroscopy
structural phase transitions
structural distortions
crystallographic domains
bidimensional correlations
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica B. Elsevier Science Bv, v. 305, n. 1, n. 48, n. 55, 2001.
Rights: fechado
Identifier DOI: 10.1016/S0921-4526(01)00555-5
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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