Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+δ

Details Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+δ Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+δ

2011-09-07

arxiv.org/abs/1109.1479v1

Modern Physics Letters B, Vol. 26, No. 4 (2012) 1150020

Physics

Condensed Matter

Superconductivity

3 figures

Scientific paper

We report the far-infrared (far-IR) observation of the Goldstone mode at ~ 72 cm-1 (~ 9 meV) predicted to exist in the superconducting phase of the transition temperature (Tc) at 45 K in the La2CuO4-based superconductors. Our observation furthers the experimental support for the two-component picture where the localized charge texture, formed at a specific planar hole density (Ppl), is tied to the HTS at Tc = 15 K, 30 K, and 45 K in a hierarchical fashion at the so-called "magic" doping level at Ppl = 1/16, 2/16, and 3/16 respectively.

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