Magnetic correlations on the full chains of ortho-II YBa2⁢Cu3⁢O6.5

Chen, W.; Hirschfeld, P. J.

doi:10.1103/physrevb.79.064522

Magnetic correlations on the full chains of ortho-II YBa₂⁢Cu_3⁢O_6.5

Journal Article · Mon Feb 23 00:00:00 EST 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.79.064522· OSTI ID:2484112

Chen, W. ^[1]; Hirschfeld, P. J. ^[2]

University of New South Wales, Sydney (Australia)
University of Florida, Gainesville, FL (United States)

We propose that the NMR line shape on the chain Cu in the stoichiometric high-T_c superconductor ortho-II YBa₂⁢Cu₃⁢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. Here, we discuss implications of the model for other experiments on underdoped YBa₂⁢Cu_3⁢O_7–δ.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484112

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 79; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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