, Brookhaven National laboratory
[Host: D. Louca]
High-temperature superconductivity in an oxide containing quasi-two-dimensional copper-oxygen planes was observed by Bednorz and Muller in 1986. Recently, several high-temperature superconductors without copper or oxygen have been discovered including MgB2 with a Tc of 39K and electric field doped C60 with a Tc as high as 117K. Infrared spectroscopy has emerged as one of the most powerful experimental tools for the study of correlated electron systems and for high-Tc superconductors in particular. This talk will be focused on the infrared studies of two representative high-Tc superconductors: MgB2 (Tc = 39.6 K) and optimally doped Bi2Sr2CaCu2O8+Â¦Ã (Tc = 91.5 K). Effects of electron-boson coupling are observed in optical conductivities for both systems and their significance with respect to superconductivity will be discussed. In general, having a small free carrier plasma frequency (< 3 eV) seems to be an universal characteristic shared by almost all high-temperature superconductors with a Tc > 30 K, which means that the issue of reduced screening should be treated carefully in all of these systems.
Condensed Matter Seminar
Thursday, April 4, 2002
Physics Building, Room 204
Note special time.
Note special room.
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