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

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

2008-11-26

arxiv.org/abs/0811.4240v2

Phys. Rev. B 79, 064522 (2009)

Physics

Condensed Matter

Superconductivity

8 pages, 8 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.79.064522

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.

Affiliated with

Also associated with

No associations

Rating

Magnetic correlations on the full chains of Ortho-II YBa$_2$Cu$_3$O$_{6.5}$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetic correlations on the full chains of Ortho-II YBa$_2$Cu$_3$O$_{6.5}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic correlations on the full chains of Ortho-II YBa$_2$Cu$_3$O$_{6.5}$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-274185