Far-infrared absorption and the metal-to-insulator transition in hole-doped cuprates

Details Far-infrared absorption and the metal-to-insulator transition in hole-doped cuprates Far-infrared absorption and the metal-to-insulator transition in hole-doped cuprates

2009-05-05

arxiv.org/abs/0905.0568v1

Physics

Condensed Matter

Superconductivity

To be published on Physical Review Letters

Scientific paper

By studying the optical conductivity of BSLCO and YCBCO, we show that the metal-to-insulator transition (MIT) in these hole-doped cuprates is driven by the opening of a small gap at low T in the far infrared. Its width is consistent with the observations of Angle-Resolved Photoemission Spectroscopy in other cuprates, along the nodal line of the k-space. The gap forms as the Drude term turns into a far-infrared absorption, whose peak frequency can be approximately predicted on the basis of a Mott-like transition. Another band in the mid infrared softens with doping but is less sensitive to the MIT.

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