Condensed-Matter Physics & Materials Science Seminar

"Hydrostatic pressure induced lattice anomalies in the cuprates:"

Presented by Efthymios Liarokapis, Department of Physics, National Technical Univ. of Athens, Athens 15780, Greece

Tuesday, March 24, 2009, 11:00 am — Bldg. 480 conference room

Τhe pressure dependence dTc/dP of the superconducting transition temperature Tc of the cuprates varies with doping and among the compounds. In some cases of strong dTc/dp>0 dependence it is a safe way to search for higher Tc compounds imitating the external by an internal (chemical) pressure. Raman spectroscopy has been proved very sensitive to small lattice distortions, which can be unnoticed by classical structural studies. Hydrostatic pressure Raman investigations on several cuprates clearly indicate lattice distortions and instabilities exactly where dTc/dP anomalies appear. Our recent synchrotron measurements on the same compounds show strong deviations from the normal behaviour at characteristic pressures, hysteresis, and the appearance of additional phases in agreement with the Raman measurements under high pressure. Furthermore, they have shown a striking correlation of certain effects with the Tc value or its pressure dependence. These new results that provide a hint about the role of lattice in the high Tc superconductivity of the cuprates will be presented and discussed.

Hosted by: Ivan Bozovic

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