Yoshio Kitaoka, Hidekazu Mukuda, Sunao Shimizu, Shin-ichiro Tabata, Parasharam M. Shirage, Akira Iyo. Novel Superconducting Phases in Copper Oxides and Iron-oxypnictides: Nmr Studies
Submitted on: Sep 11, 2012, 16:17:19
Natural Sciences / Physics / Condensed Matter Physics
Description: We reexamine the novel phase diagrams of antiferromagnetism (AFM) and high-Tc$ superconductivity (HTSC) for a disorder-free CuO_2 plane based on an evaluation of local hole density (p) by site-selective Cu-NMR studies on multilayered copper oxides. Multilayered systems provide us with the opportunity to research the characteristics of the disorder-free CuO_2 plane. The site-selective NMR is the best and the only tool used to extract layer-dependent characteristics. Consequently, we have concluded that the uniform mixing of AFM and SC is a general property inherent to a single CuO_2 plane in an underdoped regime of HTSC. The T=0 phase diagram of AFM constructed here is in quantitative agreement with the theories in a strong correlation regime which is unchanged even with mobile holes. This Mott physics plays a vital role for mediating the Cooper pairs to make T_c of HTSC very high.
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