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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 4, 2002
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Jiufeng Tu [Host: D. Louca]
Brookhaven National laboratory
"Probing Superconductors with Infrared - Electron-boson coupling in high temperature superconductors"
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+¦Ä (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.

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