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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Properties and Electronic Structure

TT 17.9: Talk

Monday, March 16, 2015, 17:15–17:30, H 2053

The evolution of microwave conductivity in YBa2Cu3O6+x across the superconducting dome — •Jordan Baglo1, James Day2, Pinder Dosanjh2, Ruixing Liang2, Walter Hardy2, and Doug Bonn21Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom — 2Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada

The rich phenomenology displayed in the phase diagram of the high-Tc cuprates continues to be an active arena of investigation. Recent experimental and theoretical work appears to be converging on a picture of separate spin and charge order phase transitions – well-below and near optimal doping, respectively – along with associated Fermi surface reconstruction. As sensitive probes of the low-energy electrodynamics, microwave spectroscopy techniques are well-suited for characterizing the effects of such changes in electronic structure deep within the superconducting state.

I will present the results of our survey of the complex microwave conductivity of YBa2Cu3O6+x over a wide range of oxygen contents, from 6.49 to 6.998, and discuss their implications for the evolution of electronic structure with doping. In particular, I will highlight the apparent absence of a peak in penetration depth near the proposed p ≈ 0.18 quantum critical point (QCP), contrasting with its presence near the antiferromagnetic QCP of the pnictide superconductors. I will also discuss the surprising relationship we observed between quasiparticle scattering lifetimes and oxygen ordering, which carries important implications for quantum oscillation measurements.

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