Model for the low-temperature magnetic phases observed in doped YBa_2Cu_3O_{6+x}

Details Model for the low-temperature magnetic phases observed in doped YBa_2Cu_3O_{6+x} Model for the low-temperature magnetic phases observed in doped YBa_2Cu_3O_{6+x}

1997-03-18

arxiv.org/abs/cond-mat/9703172v1

Physics

Condensed Matter

Superconductivity

11 pages, 2 Postscript figures, Submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevB.56.10840

A classical statistical model for the antiferromagnetic (AFM) ordering of the Cu-spins in the CuO_2 planes of reduced YBa_2Cu_3O_{6+x} type materials is presented. The magnetic phases considered are the experimentally observed high-temperature AFI phase with ordering vector Q_I=(1/2,1/2,0), and the low-temperature phases: AFII with Q_II=(1/2,1/2,1/2) and intermediate TA (Turn Angle) phases TAI, TAII and TAIII with components of both ordering vectors. It is shown that the AFII and TA phases result from an effective ferromagnetic (FM) type coupling mediated by free spins in the CuO_x basal plane. Good agreement with experimental data is obtained for realistic model parameters.

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