title: Unconventional dynamics in triangular Heisenberg antiferromagnet NaCrO2.
abstract: 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.
authors.affiliation: Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris-Sud, Orsay, France.
authors.forename: A
authors.initials: A
authors.lastname: Olariu
authors.forename: P
authors.initials: P
authors.lastname: Mendels
authors.forename: F
authors.initials: F
authors.lastname: Bert
authors.forename: B G
authors.initials: BG
authors.lastname: Ueland
authors.forename: P
authors.initials: P
authors.lastname: Schiffer
authors.forename: R F
authors.initials: RF
authors.lastname: Berger
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava