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57Fe Mössbauer studies on semiconducting and superconducting La-Ba-Cu-O

✍ Scribed by E. Baggio Saitovitch; R.B. Scorzelli; I. Souza Azevedo; C.A. Dos Santos; F.J. Litterst

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
417 KB
Volume
166
Category
Article
ISSN
0921-4534

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✦ Synopsis

La,_,BaXCu04

samples substituted with 57Fe (less than 1%) were studied for OSxSO.35. Despite the fact that there is only one Cu site which can be occupied by the iron-substituent, the 5'Fe Mijssbauer spectra at room temperature show three quadrupole doublets whose intensities were followed in different steps of sample preparation.

They are characteristic of Fe'+, and their Mijssbauer parameters depend on the Ba content. One of the iron species may be due to defects since it disappears with further heat treatment, while the others are present even in the undoped La2Cu0,. Magnetic ordering has been found at 4.2 K for samples with 0.5% Fe even in the superconducting samples with x=0.15.

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