2011/05/25 by Sunao Shimizu, Shin-ichiro Tabata, Hidekazu Mukuda +5 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Coupling (piping) #Crystallography #Cuprate #Iron-based superconductors research #Materials science #Nuclear magnetic resonance #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Stacking #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.214514
published as Phys. Rev. B 83, 214514 (2011) [7 pages]. [selected as Editors' Suggestion] · 8 pages, 7 figures, 1 Table, to be published in Physical Review B
arxiv created 2011/05/25 · openalex publication_date 2011/06/10 · arxiv updated 2011/06/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on the phase diagram of antiferromagnetism (AFM) and superconductivity (SC) in three-layered Ba2Ca2Cu3O6(F,O)2 by means of Cu-NMR measurements. It is demonstrated that AFM and SC coexist uniformly in three-layered compounds as well as in four- and five-layered ones. The critical hole density pc for the long-range AFM order is determined as pc\ensuremath≃ 0.075, which is larger than pc\ensuremath≃ 0.02 and 0.055 in single- and bilayered compounds, and smaller than pc\ensuremath≃0.08--0.09 and 0.10--0.11 in four- and five-layered compounds, respectively. This variation of pc is attributed to the magnetic interlayer coupling, which becomes stronger as the stacking number of CuO2 layers increases; that is, the uniform coexistence of AFM and SC is a universal phenomenon in underdoped regions when a magnetic interlayer coupling is strong enough to stabilize an AFM ordering. In addition, we highlight an unusual pseudogap behavior in three-layered compounds---the gap behavior in low-energy magnetic excitations collapses in an underdoped region where the ground state is the AFM-SC mixed phase.