Record Details

7Li NMR studies on the triangular lattice system LiCrO2

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title 7Li NMR studies on the triangular lattice system LiCrO2
 
Creator ALEXANDER, LK
BUTTGEN, N
NATH, R
MAHAJAN, AV
LOIDL, A
 
Subject heisenberg-antiferromagnet
2-dimensional systems
phase-transition
vortices
oxides
 
Description We report Li-7 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 Li-7 NMR intensity and the NMR spin-lattice relaxation rate 1/T-1. 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/T-1, we discuss the possible occurrence of a Kosterlitz-Thouless-Berezinskii (KTB) transition taking place at T-KTB=54 K in LiCrO2. Heat capacity data at low temperatures (T < T-N) exhibited a T-3 dependence and the ratio of interlayer to intralayer coupling constants, J(perpendicular to)/J in LiCrO2 was found to be similar to 10(-3). Lithium depletion has no significant effect on the magnetic properties and the behavior of Li0.5CrO2 is nearly unchanged from that of LiCrO2.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-16T19:25:37Z
2011-12-26T12:49:55Z
2011-12-27T05:35:45Z
2011-07-16T19:25:37Z
2011-12-26T12:49:55Z
2011-12-27T05:35:45Z
2007
 
Type Article
 
Identifier PHYSICAL REVIEW B, 76(6), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.76.064429
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4510
http://hdl.handle.net/10054/4510
 
Language en