Orthorhombic to tetragonal phase transition and superconductivity in Ba2Cu3O4Cl2

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Author(s):	da Luz, M. S. ; dos Santos, C. A. M. ; Machado, A. J. S. Total Authors: 3
Document type:	Journal article
Source:	MATERIALS SCIENCE-POLAND; v. 26, n. 3, p. 6-pg., 2008-01-01.
Abstract
The orthorhombic to tetragonal phase transition in Ba2Cu3O4Cl2 has been investigated. This transition was observed by X-ray powder diffractometry carried out in samples heat treated between 700 and 750 degrees C. Results of X-ray diffractograms simulation confirm the phase transition. dc-Magnetization measurements performed in SQUID showed the existence of a signal due to diamagnetism. The results suggest the existence of localized superconductivity and explain the different magnetic properties reported in the literature for the Ba2Cu3O4Cl2 compound. (AU)