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Antiferromagnetic ordering states of oxygen-deficient NdBa2Cu3O6+x and Nd1+yBa2-yCu3O6+x single crystals

Physical Review B 59(5): 3870-3878

Autoren/Herausgeber: Brecht E
Schweiss P
Wolf T
Boothroyd AT
Reynolds JM
Andersen NH
Lutgemeier H
Schmahl WW
Erschienen: 1999

The paper describes a study of the antiferromagnetic ordering of oxygen-deficient Nd1 + yBa2 - yCu3O6 + x single crystals. In pure, stoichiometric samples, y = 0, with different oxygen contents x in the Cu(1) plane (0.02AFII reordering. The mechanism of reordering is explained in terms of the creation of Cu2+ moments within the Cu(1) layer due to the Nd3+ ions on Ba sites, which via polarization lead to an effective ferromagnetic coupling between the moments on next-nearest neighboring Cu(2) layers. The Nd3+ doping on the Ba2+ sites increases the Neel temperature compared to the stoichiometric compound. [S0163-1829(99)02002-0].