Field induced antiferromagnetism and 17O Knight shift anomaly in La2CuO4
Abstract
We address the effect of the field induced antiferromagnetism in paramagnetic state of the cuprate weak ferromagnet La2CuO4. The planar oxygen 17O Knight shift is shown to be an effective tool to inspect the effects of Dzyaloshinsky-Moriya coupling in cuprates in an external magnetic field. Field induced antiferromagnetism and anisotropic antiferromagnetic contribution to 17K explain the anomalies observed in 17O NMR in La2CuO4. The experimental observation of antiferromagnetic contribution to the 17O Knight shift provides probably the only way to find out the problem of the sense of Dzyaloshinsky vector in cuprates.
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