Field-induced Staggered Magnetization and O17 Knight Shift Anomaly in La2 Cu O4

Abstract

We show that the puzzling planar oxygen O17 Knight shift anomalies observed by Walstedt [Phys. Rev. Lett. 72, 3610 (1994); Phys. Rev. B 64, 014404 (2001)] in paramagnetic phase of generic Dzyaloshinsky-Moriya antiferromagnetic cuprate La2 Cu O4 can be assigned to the effect of the field-induced staggered magnetization. © 2007 The American Physical Society.