Effect of iodine doping on Bi2Sr2Ca1Cu2Ox charge transfer or interlayer coupling?

✍ Scribed by Jian Ma; P. Alméras; R.J. Kelley; H. Berger; G. Margaritondo; A. Umezawa; Marvin L. Cohen; M. Onellion

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 402 KB
• Volume: 227
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90095-7

✦ Synopsis

A comparative study has been made of iodine-intercalated Bi2Sr2CalCu2Ox single crystal and 1 atm 02 annealed Bi2Sr2Ca~CulOx single crystal using an AC susceptibility measurement, X-ray photoemission (XPS) and angle-resolved ultraviolet photoemission spectroscopy (ARUPS). The AC susceptibility measurement indicates that 02 doped samples studied have a Tc of 84 K, whereas Tc of the iodine-doped samples studied are 80 K. XPS Cu 2p core-level data establish that the hole concentration in the CuO2 planes is essentially the same for these two kinds of samples. ARUPS measurements show that the electronic structure of the normal states near the Fermi level has been strongly affected by iodine intercalation. We conclude that the dominant effect of iodine doping is to alter the interlayer coupling.