Optical conductivity of<i>c</i>axis oriented<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6.70</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for a pseudogap
C. C. Homes(McMaster University), T. Timusk(McMaster University), Ruixing Liang(McMaster University), D. A. Bonn(University of British Columbia), W. N. Hardy(University of British Columbia)
Cited by 518
Abstract
The c axis reflectance of high-quality single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6+\mathit{x}}$ has been measured over a wide range of temperatures and frequencies. The x=0.70 crystal has a pseudogap in the conductivity at 200 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ which is present at room temperature. The gap deepens gradually as the temperature is lowered to 10 K with no discontinuity at ${\mathit{T}}_{\mathit{c}}$. In contrast, crystals with x=0.95 show no gap in the normal state and their superconducting state is characterized by low-lying states. These observations are consistent with phase diagrams proposed to explain NMR and neutron data.
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