We performed neutron diffraction experiments on a single crystal of an S=12 frustrated ferromagnetic chain compound NaCuMoO4(OH) at zero and finite magnetic fields. Three magnetic Bragg peaks with the propagation vector of q=(0,δ,0) [δ=0.481(1)] were observed at the zero field, which means that an incommensurate helical magnetic order was realized. Using the ratio of the intensities between these magnetic peaks, a proper-screw structure was suggested, where the spiral plane is the crystallographic ac plane. While the δ is unchanged at lower fields, it decreases linearly with the field where μ0H≥2.5T. The field dependence is consistent with that of the field-induced spin density wave state that originated from the formation of the bound state of two magnons in the S=12 frustrated ferromagnetic chain.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics