Monday, July 26, 2010, 1:00 pm — Small Seminar Room, Bldg. 510
A proper understanding of the mechanism for cuprate superconductivity can emerge only by comparing materials in which physical parameters vary one at a time. I will present a variety of bulk, resonance, and scattering measurements on the (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy high temperature superconductors, in which this can be done. We determined the superconducting, Néel, glass, and pseudogap critical temperatures, and the critical doping in which phase transitions occur. We clarify which physical parameter varies, and, equally important, which does not, with each chemical modification. This allows us to demonstrate that a single energy scale, set by the superexchange interaction J, controls all the critical temperatures of the system. J, in-turn, is determined by the in plane Cu-O-Cu buckling angle.
Hosted by: Genda Gu
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