Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 61: Correlated Electrons: (General) Theory 2

TT 61.7: Talk

Thursday, March 23, 2017, 11:15–11:30, HSZ 204

Lattice effects on the superfluid stiffness — •Matthias Hecker and Jörg Schmalian — TKM, KIT, Karlsruhe, Germany

The underdoped regime of the copper oxide superconductors with its rich set of physical features has been intensely debated over years, while the overdoped side, perceived as simple and said to follow a BCS behavior, has been mostly disregarded. In a recent experiment on the overdoped side of La_2−xSr_xCuO₄ [1], yet, a stark contrast between the BCS prediction on the superfluid stiffness and the measurement outcome has been observed. We investigate whether the discrepancy in the superfluid stiffness can be rooted in the underlying lattice and the concomitant electronic dispersion relation. In particular, we work out the impact of fluctuation corrections to the superfluid stiffness in a Galilei-non-invariant system.

[1] Božović, I., He, X., Wu, J. & Bollinger, A.T., Nature 536, 309 (2016).