Dopant-site occupancies and superconducting properties of the Fe-substituted La2.5Nd0.5CaBa3(Cu1−xFex)7Oz perovskite

The structural and superconducting properties of single-phase Fe-substituted La2.5Nd0.5CaBa3(Cu1-xFex)7Oz (LNCBCuFe) with 0.0 < x < 0.06 compounds having triple-perovskite structure are investigated using XRD, a.c. susceptibility, d.c. magnetization, O content, and Mossbauer effect measurement...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000-12, Vol.340 (4), p.317-322
Main Authors: Kundaliya, Darshan C, Vij, Reeta, Kuberkar, D.G, Kulkarni, R.G
Format: Article
Language:English
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Summary:The structural and superconducting properties of single-phase Fe-substituted La2.5Nd0.5CaBa3(Cu1-xFex)7Oz (LNCBCuFe) with 0.0 < x < 0.06 compounds having triple-perovskite structure are investigated using XRD, a.c. susceptibility, d.c. magnetization, O content, and Mossbauer effect measurements. Mossbauer spectral analysis of x=0.03 sample displays unusual Fe-dopant site occupancies and the Cu(2) plane to Cu(1) chain site ratio in the LNCBCuFe are different from those of the usual Fe-doped YBa2Cu3O7-d. Specifically, authors observe occupation of a new chain-associated quasi-octahedral site, E, at 300 K which transforms into the well-known distorted tetrahedron chain site, A, on lowering the temperature to 78 K. The observed reduction of Tc with increasing x in LNCBCuFe supports the view that the hole filling mechanism contributes to the suppression of superconductivity by Fe. 26 refs.
ISSN:0921-4534
DOI:10.1016/S0921-4534(00)01514-8