Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

2003/12/22 by H. Eisaki, Hiroshi Eisaki, Nobu‐Hisa Kaneko +9 · 11 citations
Chemistry · Materials Science · Physics and Astronomy · #Bismuth #Chemistry #Condensed matter physics #Copper oxide #Crystallography #Cuprate #Ion #Ionic radius #Magnetic and transport properties of perovskites and related materials #Materials science #Oxide #Physics #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.69.064512

published as Phys. Rev. B 69, 064512 (2004) · 9 pages, 3 figures, to appear in Phys. Rev. B

arxiv created 2003/12/22 · openalex publication_date 2004/02/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We examine the effect on the superconducting transition temperature (T_c) of chemical inhomogeneities in Bi₂Sr₂CuO_6+\ensuremathδ and Bi₂Sr₂CaCu₂O_8+\ensuremathδ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of T_c. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi₂Sr_1.6Ln_0.4CuO_6+\ensuremathδ results in a monotonic decrease of T_c with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the T_c of Bi₂Sr₂CaCu₂O_8+\ensuremathδ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

Citations

• Angle-resolved photoemission studies of the cuprate superconductors
• Inherent inhomogeneities in tunneling spectra ofBi2Sr2CaCu2O8−xcrystals in the superconducting state
• Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−xLaxCuO6
• 63CuNQR Evidence for Spatial Variation of Hole Concentration inLa2−xSrxCuO4
• Electronic liquid-crystal phases of a doped Mott insulator
• Metal-to-Insulator Crossover in the Low-Temperature Normal State ofBi2Sr2−xLaxCuO6+δ

Cited by

• Effects of next-nearest-neighbor hoppingt′on the electronic structure of cuprate superconductors
• Orbital mixture effect on the Fermi-surface–Tccorrelation in the cuprate superconductors: Bilayer vs. single layer
• Origins of large critical temperature variations in single-layer cuprates
• Isotopic Fingerprint of Electron-Phonon Coupling in High-TcCuprates
• Nernst Effect and Disorder in the Normal State of High-TcCuprates
• Spin correlations in the electron-doped high-transition-temperature superconductor Nd2-xCexCuO4±δ
• In-Plane Magnetoresistance Obeys Kohler’s Rule in the Pseudogap Phase of Cuprate Superconductors
• Universal quantum oscillations in the underdoped cuprate superconductors
• Elastic forward scattering in the cuprate superconducting state
• Enhancement of electronic inhomogeneities due to out-of-plane disorder inBi2Sr2CuO6+δsuperconductors observed by scanning tunneling spectroscopy
• Electronic structure of the cuprate superconducting and pseudogap phases from spectroscopic imaging STM