NMR and local-density-approximation evidence for spiral magnetic order in the chain cuprate LiCu2O2
A. A. Gippius, E. N. Morozova, A. S. Moskvin, A. V. Zalessky, A. A. Bush, M. Baenitz, H. Rosner, S.-L. Drechsler
DOI 10.1103/PhysRevB.70.020406 · Physical Review B
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Abstract
We report on Li6,7 nuclear magnetic resonance measurements of the spin-chain compound LiCu2O2 in the paramagnetic and magnetically ordered states. Below 24K 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. Li7 NMR reveals strong phason-like dynamical fluctuations extending well below 24K. A series of phase transitions at 24.2, 22.5, and 9K is observed. Local density approximation based calculations of exchange integrals reveal a large in-chain frustration leading to a magnetical spiral.
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