Li7 NMR studies on the triangular lattice system LiCrO2

L. K. Alexander, N. Büttgen, R. Nath, A. V. Mahajan, and A. Loidl
Phys. Rev. B 76, 064429 – Published 24 August 2007

Abstract

We report Li7 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 Li7 NMR intensity and the NMR spin-lattice relaxation rate 1T1. 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 1T1, we discuss the possible occurrence of a Kosterlitz-Thouless-Berezinskii (KTB) transition taking place at TKTB=54K in LiCrO2. Heat capacity data at low temperatures (TTN) exhibited a T3 dependence and the ratio of interlayer to intralayer coupling constants, JJ in LiCrO2 was found to be 103. Lithium depletion has no significant effect on the magnetic properties and the behavior of Li0.5CrO2 is nearly unchanged from that of LiCrO2.

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  • Received 14 December 2006

DOI:https://doi.org/10.1103/PhysRevB.76.064429

©2007 American Physical Society

Authors & Affiliations

L. K. Alexander1, N. Büttgen2, R. Nath2, A. V. Mahajan1, and A. Loidl2

  • 1Department of Physics, Indian Institute of Technology, Mumbai 400076, India
  • 2Experimentalphysik V, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany

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Issue

Vol. 76, Iss. 6 — 1 August 2007

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