Spin polarization of the magnetic spiral in NaCu2O2, as seen by NMR
Abstract
The incommensurate (IC) spin ordering in quasi-1D edge-shared cuprate NaCu2O2 has been studied by 23Na nuclear magnetic resonance spectroscopy in an external magnetic field near 6 Tesla applied along the main crystallographic axes. The NMR lineshape evolution above and below TN≈12 K yields a clear signature of an IC static modulation of the local magnetic field consistent with a Cu2+ spin spiral polarized in the bc-plane rather than in the ab-plane as reported from earlier neutron diffraction data.
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