Structure and Superconductivity of Dy (Ba2-y Lay) Cu3 Oz (0 ≤ y ≤ 0.5) System

Author

Amish G. Joshi
S. K. Malik
William B. Yelon, Missouri University of Science and TechnologyFollow

Abstract

Structural and superconducting properties of single-phase La-substituted compounds of the formula Dy(Ba _2-yLa_y)Cu₃O_z (0.0≤y≤0.5) have been investigated by neutron diffraction, electrical resistivity, and magnetization measurements. The compound DyBa ₂Cu₃O_7-δ (orthorhombic, space group Pmmm) exhibits superconductivity with transition temperature, T c, of about 90 K. Rietveld analysis of the neutron diffraction data on La containing compounds reveals that the orthorhombicity decreases with increasing La concentration and the compounds become tetragonal for higher La content. The overall oxygen content increases as divalent Ba is replaced by trivalent La and approximately compensates for the difference in the valence state of these two ions. The superconducting transition temperature, obtained from low field magnetization and/or four-probe resistivity measurements, decreases from ∼90 K for y=0.0 to ∼34 K for y=0.5. The depression in T c in Dy(Ba_2-yLa_y)Cu₃O_z system is attributed to hole filling/localization caused by the rare earth substitution at the Ba site. © 2002 American Institute of Physics.

Recommended Citation

A. G. Joshi et al., "Structure and Superconductivity of Dy (Ba2-y Lay) Cu3 Oz (0 ≤ y ≤ 0.5) System," Journal of Applied Physics, vol. 91, no. 10 I, pp. 8498 - 8500, American Institute of Physics, May 2002.

The definitive version is available at https://doi.org/10.1063/1.1450824

Department(s)

Physics

Publication Status

Available Access

International Standard Serial Number (ISSN)

0021-8979

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 American Institute of Physics, All rights reserved.

Publication Date

15 May 2002