corner
corner
APS » Journals » Phys. Rev. B » Volume 69 » Issue 6
< Previous Article | Next Article >

Phys. Rev. B 69, 064512 (2004) [8 pages]

Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors

Download: PDF (470 kB) Buy this article Export: BibTeX or EndNote (RIS)

H. Eisaki*, N. Kaneko†, D. L. Feng‡, A. Damascelli§, P. K. Mang, K. M. Shen, Z.-X. Shen, and M. Greven
Department of Applied Physics, Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA

Received 8 October 2003; revised 4 November 2003; published 27 February 2004

We examine the effect on the superconducting transition temperature (Tc) of chemical inhomogeneities in Bi2Sr2CuO6+δ and Bi2Sr2CaCu2O8+δ single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of Tc. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi2Sr1.6Ln0.4CuO6+δ results in a monotonic decrease of Tc with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the Tc of Bi2Sr2CaCu2O8+δ can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.064512
DOI:
10.1103/PhysRevB.69.064512
PACS:
74.62.Bf, 74.62.Dh, 74.72.Hs

*Present address: Nanoelectronic Research Institute, AIST, Tsukuba 305-8568, Japan.

†Present address: National Metrology Institute of Japan, AIST, Tsukuba 305-8568, Japan.

‡Present address: Department of Physics & Astronomy, The University of British Columbia, 334-6224 Agricultural Rd. Vancouver, B. C. V6T 1Z1, Canada and Department of Physics, Fudan University, Shanghai, China.

§Present address: Department of Physics & Astronomy, The University of British Columbia, 334-6224 Agricultural Rd. Vancouver, B. C. V6T 1Z1, Canada.

 
< Previous Article | Next Article >