title: Evidence for two electronic components in high-temperature superconductivity from NMR.
abstract: A new analysis of (63)Cu and (17)O NMR shift data on La(1.85)Sr(0.15)CuO(4) is reported that supports earlier work arguing for a two-component description of La(1.85)Sr(0.15)CuO(4), but conflicts with the widely held view that the cuprates are a one-component system. The data are analyzed in terms of two components A and B with susceptibilities χ(AA), χ(AB)(= χ(BA)) and χ(BB). We find that above T(c), χ(AB) and χ(BB) are independent of temperature and obtain for the first time the temperature dependence of all three susceptibilities above T(c) as well as the complete temperature dependence of χ(AA)+χ(AB) and χ(AB)+χ(BB) below T(c). The form of the results agrees with that recently proposed by Barzykin and Pines.
authors.affiliation: Faculty of Physics and Earth Science, University of Leipzig, D-04103 Leipzig, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Haase
authors.forename: C P
authors.initials: CP
authors.lastname: Slichter
authors.forename: G V M
authors.initials: GV
authors.lastname: Williams