Low Temperature AC Conductivity in BSCCO (2212)
J. Corson (1), R. Mallozzi (1), J. Orenstein (1), J. N. Eckstein (2),, I. Bozovic (3) ((1) UC Berkeley, Lawrence Berkeley National Lab, (2) Univ., of Illinois at Urbana, (3) Oxxel GmbH)
TL;DR
This study measures the complex conductivity of BSCCO (2212) thin films at microwave frequencies across different doping levels, revealing a large residual dissipative conductivity at low temperatures that exceeds quasiparticle contributions.
Contribution
It provides new experimental data on low-temperature AC conductivity in BSCCO (2212) and identifies a residual dissipation component not explained by quasiparticles.
Findings
Residual dissipative conductivity scales with superfluid density.
Dissipative conductivity exceeds quasiparticle contributions.
Conductivity measurements span 100-600 GHz and various doping levels.
Abstract
We report measurements of anamolously large dissipative conductivities in BiSrCaCuO(2212) at low temperatures. We have measured the complex conductivity of BSCCO thin films at 100-600 GHz as a function of doping from the underdoped to the overdoped state. At low temperatures there exists a residual dissipative conductivity which scales with the T=0 superfluid density as the doping is varied. This residual dissipative conductivity is larger than the possible contribution from a thermal population of quasiparticles at the d-wave gap nodes.
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