Rare-earth ion size effect on resistivity, susceptibility, and superconductivity of RBa2Cu3−xZnxO7−y (R= Yb, Er, Y, Dy, Gd, Eu, Sm, and Nd)

Yunhui Xu; S. S. Ata-Allah; M. G. Berger; O. Glück

doi:10.1103/PhysRevB.53.15245

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Rare-earth ion size effect on resistivity, susceptibility, and superconductivity of RBa2Cu3−xZnxO7−y (R= Yb, Er, Y, Dy, Gd, Eu, Sm, and Nd)

Yunhui Xu, S. S. Ata-Allah, M. G. Berger, O. Glück

DOI 10.1103/PhysRevB.53.15245 · Physical Review B

T1

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Abstract

A systematic study of Zn doping on the resistivity ρ, dc susceptibility χ, and superconducting Tc of RBa2Cu3−xZnxO7−y systems (R=Yb, Er Y, Dy, Gd, Eu, Sm, and Nd, and 0≤x≤0.3) is reported. X-ray powder diffraction (XRD) shows that all samples consist essentially of a single phase and retain the orthorhombic structure in the range of 0≤x≤0.3 (except for R=Yb in the range of 0≤x≤0.15). By analyzing our Raman spectra and XRD data, Zn atoms are found more likely to substitute on Cu(2) sites. Doping with Zn on the Cu site in these systems causes a rapid nearly linear decrease of Tc as Zn content increases. The reduction of Tc for RBa2Cu3−xZnxO7−y is found to depend strongly on the ionic radius of the rare-earth element R. This effect resembles the ion size effect on Tc in R1−xPrxBa2Cu3O7−y, where Pr substitutes on the R site, and in RBa2Cu3−xGaxO7−y, where Ga substitutes on the Cu(1) sites in Cu-O chains, although in the RBa2Cu3−xZnxO7−y systems Zn is found to be more likely to substitute on the Cu(2) sites in Cu-O2 planes. The suppression of superconductivity by zinc and the rare-earth ion size effect on Tc in these systems is interpreted in terms of a Mott spin bipolaron model. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YbBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
ErBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
DyBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
GdBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
EuBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
SmBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NdBa2Cu3-xZnxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
R1-xPrxBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
RBa2Cu3-xGaxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown