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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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