Magnetic correlations on the full chains of Ortho-II YBa${}_2$Cu${}_3$O${}_{6.5}$

Abstract

We propose that the NMR line shape on the chain Cu in the stoichiometric high-$T_c$ superconductor Ortho-II YBa${}_2$Cu${}_3$O${}_{6.5}$ is determined by the magnetization induced on Cu near O vacancies, due to strong magnetic correlations in the chains. An unrestricted Hartree-Fock calculation of a coupled chain-plane Hubbard model with nearest-neighbor d-wave pairing interaction shows that the broadening of NMR lines is consistent with disorder-induced magnetization at low temperatures. In addition, we give a possible explanation of the anomalous bimodal line shape observed at high temperatures in terms of nonuniform Cu valence in the chains. The proximity between chains and CuO plane induces anisotropic magnetization on the planar Cu, and broadens the plane NMR lines in accordance with that of the chain lines, in agreement with experiment. We discuss implications of the model for other experiments on underdoped YBCO.

arXiv comment8 pages, 8 figures, submitted to PRB

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Cited by in corpus (6)

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• Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy
• Observation of electronic bound states in charge-ordered YBa${}_2$Cu${}_3$O${}_y$
• Absence of $\mu$SR evidence for magnetic order in the pseudogap phase of Bi${}_{2+x}$Sr${}_{2-x}$CaCu${}_2$O${}_{8+\delta }$
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Magnetic anisotropy from linear defect structures in correlated electron systems