NMR and LDA evidence for spiral magnetic order in the chain cuprate LiCu2O2

Details NMR and LDA evidence for spiral magnetic order in the chain cuprate LiCu2O2 NMR and LDA evidence for spiral magnetic order in the chain cuprate LiCu2O2

2003-12-30

arxiv.org/abs/cond-mat/0312706v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.020406

We report on {6,7}Li nuclear magnetic resonance measurements of the spin-chain compound LiCu2O2 in the paramagnetic and magnetically ordered states. Below T about 24 K the NMR lineshape presents a clear signature of incommensurate (IC) static modulation of the local magnetic field consistent with an IC spiral modulation of the magnetic moments. {7}Li NMR reveals strong phason-like dynamical fluctuations extending well below 24 K. We hypothesize that a series of phase transitions at 24.2, 22.5, and 9 K reflects a "Devil's staircase" type behavior generic for IC systems. LDA based calculations of exchange integrals reveal a large in-chain frustration leading to a magnetical spiral.

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