2006/12/17 by L. K. Alexander, Alexander, L. K., Norbert Buettgen +8
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties and Synthesis of Ferrites #Strongly Correlated Electrons (cond-mat.str-el) #Thermal Expansion and Ionic Conductivity #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0612435
14 pages, 9 figures, submitted to PRB
arxiv created 2006/12/17 · openalex publication_date 2006/12/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 TN to nearly 4TN. This suggests the existence of magnetic correlations at temperatures well above TN 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 TKTB = 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.