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Superconductivity and Fe57 Mössbauer study in (La1−xSrx)2Cu1−yFermyO4

✍ Scribed by J. Arai; T. Nitta; K. Umezawa

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
148 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

In order to investigate the electronic configuration on CuO2 plane,Fe 57 Mi~ssbauer effect is measured for the samples (Lal-xSrx)zCul-yFeyO4. The analysis of Isomer shift reveals that s-electron density at Fe 3' nucleus increases with increasing carrier density. From the analysis of quadrupole splitting at room temperature, electric field gradient (E.F.G) at Fea* nucleus is obtained, whose value decreases linearly with increase of Sr-concentration.

The E.F.G values calculated from point charge of oxygen ions which surroud octahedrally a Fe 3" ion fit fairly to the

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## 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 d