Influence of rare-earth ionic radius on the properties of Ni- and Fe-substituted {ital R}Ba{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7{minus}{ital y}} systems ({ital R}=Y,Nd,Eu,Gd,Ho,Tm; {ital M}=Ni,Fe)
- Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow Region, 142092 (Russia)
The crystal structure parameters, temperature dependences of resistance {ital R}({ital T}), and concentration dependences of superconducting transition temperature {ital T}{sub {ital c}}({ital x}) for the Ni- and Fe-substituted {ital R}Ba{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7{minus}{ital y}} systems based on Y and several rare earths ({ital R}=Y,Nd,Eu,Gd,Ho,Tm; {ital M}=Ni,Fe) have been investigated. It was found that the {parallel}{partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital x}{parallel} parameter for both kinds of substitution depends mainly on the value of {ital R}{sup 3+} ionic radius of the host matrix. As {ital R} changes from Tm to Nd the value of {parallel}{partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital x}{parallel} increases by approximately three and four times for Ni and Fe substitutions correspondingly. No correlations of the {parallel}{partial_derivative}{ital T}{sub {ital c}}/{partial_derivative}{ital x}{parallel} value with {ital R}{sup 3+} localized magnetic moment were observed. The prime role of {ital R}{sup 3+} ionic radius variation on the properties of {ital R}Ba{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7{minus}{ital y}} systems as well as the same effect observed earlier for {ital R}{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} systems are discussed. The essentially different shapes of superconducting transitions for the Ni- and Fe-substituted systems are pointed out. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 279104
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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