NMR Determination of the Low-Field Magnetic Structure of the Cu-Based Mineral Rouaite Cu${}_2$(OH)${}_3$NO${}_3$

Abstract

Frustrated interactions in the Cu-based mineral rouaite with alternating antiferromagnetic and ferromagnetic spin chains, Cu${}_2$(OH)${}_3$NO${}_3$, introduce non-trivial magnetic ground states and exotic excitations arising from them. We investigated the magnetic structure of Cu${}_2$(OH)${}_3$NO${}_3$ by ${}^1$H- and ${}^2$H-NMR measurements on single crystals. The internal fields in the ordered state were microscopically measured using the H nuclear moments as a local probe. The directions of the ordered moments were determined by comparing the experimental results to model calculations. The obtained magnetic structure suggests the importance of Dzyaloshinskii-Moriya interactions in stabilizing the low-field magnetic structure. The present result advances the theoretical understanding of the low-field magnetic states and will enable exploration of the exotic magnetic states emerging in high magnetic fields.

8 pages, 9 figures

References in corpus (5)

• Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
• Coexistence and interaction of spinons and magnons in an antiferromagnet with alternating antiferromagnetic and ferromagnetic quantum spin chains
• Coupled frustrated ferromagnetic and antiferromagnetic quantum spin chains in the quasi-one-dimensional mineral antlerite, Cu${}_3$SO${}_4$(OH)${}_4$
• Possible coexistence of short-range resonating-valence-bond and long-range stripe correlations in the spatially anisotropic triangular-lattice quantum magnet Cu${}_2$(OH)${}_3$NO${}_3$
• Magnetic Phase Diagram of Rouaite, Cu${}_2$(OH)${}_3$NO${}_3$