Origin of Tc suppression due to R=Eu, Nd, and Pr in superconducting (La1−xRx)1.82Sr0.18CuO4
Juichiro Arai, Yoshiko Iwata, Kikuo Umezawa
DOI 10.1103/PhysRevB.54.12557 · Physical Review B
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Abstract
The origin of Tc suppression due to substitution of rare-earth elements (R) is investigated for the samples of (La1−xRx)1.82Sr0.18CuO4, (R=Eu,Nd,Pr) through the measurements of electrical resistivity and lattice parameters. With increasing x, three phases, T, T*, and T′ appear successively and the critical concentration for disappearance of superconductivity exists in the T-phase region, each of which is x=0.12, 0.4, and 0.6 for R=Eu, Nd, and Pr, respectively, indicating that the smaller the ionic radius of the substituted R element, the stronger the Tc suppression. Temperature dependence of the conductivity is described by σ∝lnT above x=0.08 and 0.1 for R=Eu and Nd, respectively, but not for R=Pr. The origin of Tc suppression is discussed in terms of two contributions; the reduction of the Madelung site potential at apical oxygen sites and the random potential scattering on the CuO2 planes which is effective for pair breaking in d-wave superconductors, both of which are caused by displacement of apical oxygens due to substitution of R elements. © 1996 The American Physical Society.
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