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Disrupting superconductivity: how coexisting phases modify superconductivity in electron and hole-doped cuprates

Inna Vishik, MIT
Wednesday, February 3, 2016 - 4:00pm to 5:00pm
PAA A-110

High temperature superconductivity in copper-oxide materials is one of the most enduring unexplained emergent phenomena in correlated electron systems. One key to unraveling the mechanism of high temperature superconductivity is to understand the normal state and how this electronic phase interacts with superconductivity when the two coexist. I will show studies on both hole and electron doped cuprates showing how superconductivity is modified by the coexistence of another electronic state. In hole-doped cuprates, the normal state is the enigmatic ‘pseudogap’, and we identify its presence below Tc as a superconducting gap whose magnitude is independent of transition temperature. At the underdoped edge of the superconducting dome, a gap appears at the nodal momentum where zero superconducting gap was protected by symmetry at higher dopings, and this is likely related to a remnant of the antiferromagnetic parent compound. On the electron-doped side, antiferromagnetism and short-range correlations thereof play even more prominently into the momentum-dependence of superconductivity. In particular, we observe a doping-dependent appearance of line nodes in the gap function reflecting the evolution of fermiology due to antiferromagnetism.​

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