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Ba$_2$Cu$_3$O$_4$Cl$_2$ has two inter-penetrating square Cu sublattices, onewith square root 2 times the in-plane spacing of the other. Isotropic magneticinteractions between the two sublattices are completely frustrated. Quantumfluctuations resolve the intrinsic degeneracy in the ordering direction of themore weakly coupled sublattice in favor of collinear ordering. We presentneutron scattering and magnetization studies of the magnetic structure when theCu ions are substituted with Co. The Co spins create new magnetic interactionsbetween the two sublattices. The ordering behavior of both Cu sublattices isretained largely unmodified. Between the phase transitions of the twosublattices spin-glass behavior is observed. Magnetization results show astrong enhancement to the ferromagnetic aspect of the magnetic structure. Thecombination of glassy behavior and large moments strongly suggest that the Comoments induce the formation of local canted states.Comment: 4 figure

physical review. b, condensed matter and materials physics

Neutron scattering and magnetization studies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>2.95</mml:mn></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>0.05</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: A decorated two-dimensional …

Neutron scattering and magnetization studies ofBa2Cu2.95Co0.05O4Cl2: A decorated two-dimensional …