Abstract
In order to elucidate the magnetic nature of the lithium chromium dioxide LiCrO2, in which the Cr3+ ions form a two-dimensional triangular lattice in the CrO2 plane, we have performed a positive muon-spin rotation and relaxation (μ+SR) experiment using a powder sample at the temperatures below 155 K. Weak-transverse-field measurements indicated the existence of a bulk antiferromagnetic (AF) transition at TN=61.2 K. The ZF-μ+SR measurements indicated that LiCrO2 is a pure paramagnet for T ≥ 62.5 K, since its internal magnetic field (Hint) can be explained by solely nuclear magnetic moments. This means that, contrary to previous suggestions by susceptibility and heat capacity measurements, no short-range order exists for T ≥ 62.5 K. However, ZF-μ+SR detected the change in Hint from a low-T static state to a high-T dynamic state at 115 K, most likely connected to a change in the position/motion of the Li ions.
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