Unconventional dynamics in triangular Heisenberg antiferromagnet NaCrO2.
We report magnetization, specific heat, muon spin rotation, and Na NMR measurements on the S=3/2 rhombohedrally stacked Heisenberg antiferromagnet NaCrO2. This compound appears to be a good candidate for the study of isotropic triangular Heisenberg antiferromagnets with very weak interlayer coupling. While specific heat and magnetization measurements indicate the onset of a transition in the range Tc approximately 40-50 K, both muon spin rotation and NMR reveal a fluctuating crossover regime extending well below Tc, with a peak of relaxation rate T1(-1) around T approximately 25 K. This novel finding is discussed within the context of excitations in the triangular Heisenberg antiferromagnets.
Olariu
A
A
Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris-Sud, Orsay, France.
Mendels
P
P
Bert
F
F
Ueland
B G
BG
Schiffer
P
P
Berger
R F
RF
Cava
R J
RJ