NMR and local-density-approximation evidence for spiral magnetic order in the chain cuprateLiCu2O2

2003/12/30 by A.A. Gippius, A. A Gippius, E. N. Morozova +11 · 8 citations
Chemistry · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Chain (unit) #Chemistry #Condensed matter physics #Crystallography #Cuprate #Magnetic properties of thin films #Mathematics #Nuclear magnetic resonance #Order (exchange) #Paramagnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spiral (railway) #Superconductivity #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.70.020406

4 pages, 4 figures

arxiv created 2003/12/30 · openalex publication_date 2004/07/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report on ^6,7Li nuclear magnetic resonance measurements of the spin-chain compound LiCu₂O₂ in the paramagnetic and magnetically ordered states. Below 24\phantom\rule0.3em0exK the NMR line shape shows a clear signature of incommensurate (IC) static modulation of the local magnetic field consistent with an IC spiral modulation of the magnetic moments. ⁷Li NMR reveals strong phason-like dynamical fluctuations extending well below 24\phantom\rule0.3em0exK. A series of phase transitions at 24.2, 22.5, and 9\phantom\rule0.3em0exK is observed. Local density approximation based calculations of exchange integrals reveal a large in-chain frustration leading to a magnetical spiral.

Citations

• NMR Imaging of the Soliton Lattice Profile in the Spin-Peierls CompoundCuGeO3
• Coexistence of dimerization and long-range magnetic order in the frustrated spin-chain systemLiCu2O2:Inelastic light scattering study

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