Topological Defects Coupling Smectic Modulations to Intra-unit-cell Nematicity in Cuprate

Details Topological Defects Coupling Smectic Modulations to Intra-unit-cell Nematicity in Cuprate Topological Defects Coupling Smectic Modulations to Intra-unit-cell Nematicity in Cuprate

2011-08-02

arxiv.org/abs/1108.0487v1

Science 333, 426 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

We study the coexisting smectic modulations and intra-unit-cell nematicity in the pseudogap states of underdoped Bi2Sr2CaCu2O8+{\delta}. By visualizing their spatial components separately, we identified 2\pi topological defects throughout the phase-fluctuating smectic states. Imaging the locations of large numbers of these topological defects simultaneously with the fluctuations in the intra-unit-cell nematicity revealed strong empirical evidence for a coupling between them. From these observations, we propose a Ginzburg-Landau functional describing this coupling and demonstrate how it can explain the coexistence of the smectic and intra-unit-cell broken symmetries and also correctly predict their interplay at the atomic scale. This theoretical perspective can lead to unraveling the complexities of the phase diagram of cuprate high-critical-temperature superconductors.

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