Field induced antiferromagnetism and $^{17}$O Knight shift anomaly in La$_2$CuO$_4$

Details Field induced antiferromagnetism and $^{17}$O Knight shift anomaly in La$_2$CuO$_4$ Field induced antiferromagnetism and $^{17}$O Knight shift anomaly in La$_2$CuO$_4$

2006-10-20

arxiv.org/abs/cond-mat/0610571v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure, submitted to PRB

Scientific paper

We address the effect of the field induced antiferromagnetism in paramagnetic state of the cuprate weak ferromagnet La$_2$CuO$_4$. The planar oxygen $^{17}$O 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 $^{17}$K explain the anomalies observed in $^{17}$O NMR in La$_2$CuO$_4$. The experimental observation of antiferromagnetic contribution to the $^{17}$O Knight shift provides probably the only way to find out the problem of the sense of Dzyaloshinsky vector in cuprates.

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