Search for the origin of giant Tc suppression in YBa2Cu3O7−d doped simultaneously with Fe and Zn

✍ Scribed by S.B. Ogale; K.M. Gapchup; Pramada Lele; D.D. Choughule; R.C. Chikate; G. Marest

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 506 KB
• Volume: 257
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00707-5

✦ Synopsis

In a recent paper [S. B. Ogale et al., Solid State Commun 89 (1994) 1] we reported that the superconducting transition temperature (T c) is suppressed drastically in YBa2Cu30 7_ d (YBCO) doped simultaneously with Fe and Zn as compared to an equivalent total doping of Zn or Fe, on the higher side of dopant concentration (approximately 3% or more substitution at Cu sites). In this paper, we report the results of our studies on this co-doped system, performed using the techniques of M~Sssbauer spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and iodometry, to explore the origin of the reported observation. The T e suppression appears to be caused by a drop in the concentration of mobile holes in the CuO a planes as well as to be due to a reduced dimensionality of the system resulting from the suppression of the order parameter between the CuO 2 planes by the Fe atoms.