7Li NMR, magnetic susceptibility, and heat capacity studies on the triangular lattice system LiCrO2
msra(2006)
Abstract
We report 7Li NMR, magnetic susceptibility, and heat capacity measurements on
the triangular lattice Heisenberg antiferromagnet compound LiCrO2. We find that
in contrast to NaCrO2, magnetic properties of LiCrO2 have a more pronounced
three dimensional character with sharp anomalies in the temperature variation
of the 7Li NMR intensity and the NMR spin-lattice relaxation rate 1/T1. From
heat capacity measurements we find that the total entropy related to the
magnetic transition is in agreement with expectations. However, we find a
significant contribution to the magnetic entropy in the range from the ordering
temperature T_N to nearly 4T_N. This suggests the existence of magnetic
correlations at temperatures well above T_N which might be due to the
frustrated nature of the system. Based on the temperature dependence of 1/T1,
we discuss the possible occurrence of a Kosterlitz-Thouless-Berezinskii
transition taking place at T_KTB = 55 K in LiCrO2. Lithium depletion has no
significant effect on the magnetic properties and the behaviour of Li0.5CrO2 is
nearly unchanged from that of LiCrO2.
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Key words
triangular lattice,magnetic properties,magnetic susceptibility,three dimensional,heat capacity
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