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|Type:||Artigo de periódico|
|Title:||Raman-scattering And Weak-ferromagnetism Studies In Eu2.xprxcuo4|
|Abstract:||We have performed magnetization and Raman experiments in single crystals of Eu2-xPrxCuO4 (0 < x < 1) and the results were interpreted in terms of local distortions within the CuI2 planes. We find that samples grown in Pt crucibles contain Pt impurities, that are partially responsible for these distortions. We observed: i) the appearance of two forbidden Raman modes (/RM) and ii) a weak-ferromagnetic (WF) component when the crystals are field cooled in the afr-plane. The temperature where the WF component is first observed, TWF > the coercive field, HC, and the intensity of the /RM decrease as the Pt content decreases. For crystals with a similar Pt content, the above quantities are larger for samples with smaller lattice unit cell volume, V. We concluded that the Pt impurities and/or the reduction of V beyond a critical value, Vc, are the origin of these orthorhombic distortions which in turn are responsible for the fRM and WF observed in these compounds. © 1999 Trans Tech Publications,.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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