Unconventional dynamics in triangular Heisenberg antiferromagnet NaCrO2

A. Olariu, P. Mendels, F. Bert, B. G. Ueland, P. Schiffer, R. F. Berger, R. J. Cava

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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∼40-50K, 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 25K. This novel finding is discussed within the context of excitations in the triangular Heisenberg antiferromagnets.

Original languageEnglish (US)
Article number167203
JournalPhysical review letters
Issue number16
StatePublished - Oct 25 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Olariu, A., Mendels, P., Bert, F., Ueland, B. G., Schiffer, P., Berger, R. F., & Cava, R. J. (2006). Unconventional dynamics in triangular Heisenberg antiferromagnet NaCrO2. Physical review letters, 97(16), [167203]. https://doi.org/10.1103/PhysRevLett.97.167203