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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Diamagnetism and structural transition in the Ba2Cu3O4Cl2 compound

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Author(s):
M. S. da Luz [1] ; C. A. M. dos Santos [2] ; A. J. S. Machado [3] ; B. Ferreira [4]
Total Authors: 4
Affiliation:
[1] FAENQUIL. Departamento de Engenharia de Materiais. Grupo de Supercondutividade - Brasil
[2] FAENQUIL. Departamento de Engenharia de Materiais. Grupo de Supercondutividade - Brasil
[3] FAENQUIL. Departamento de Engenharia de Materiais. Grupo de Supercondutividade - Brasil
[4] FAENQUIL. Departamento de Engenharia de Materiais. Grupo de Supercondutividade - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Journal of Physics; v. 32, n. 3, p. 744-747, 2002-09-00.
Abstract

This work presents a study of structural and magnetic properties of the Ba2Cu3O4Cl2 (Ba2342) compound. Doped samples with K or Sr in the Ba site and Zn or Mg in the Cu site of the Ba2342 were prepared using a solid state diffusion method. They were characterized by X-ray powder diffractometry, scanning electron microscopy and dc-magnetization. Samples with Ba2342 composition presented tetragonal structure of the I4/mmm space group when heat-treated at 750ºC. A structural transition was observed when the samples were doped with Zn or Mg or heat-treated at 700ºC. dc-Magnetization measurements performed in SQUID showed the existence of diamagnetic signal. A difference of the magnetic moments measured at zero field cooled (ZFC) and field-cooled (FC) procedures was observed suggesting the existence of localized superconductivity in this oxychloride system. (AU)