Abstract
Powder neutron diffraction on Tb2C2I2 reveals strong resolution-limited magnetic Bragg reflections below 60 K due tocommensurate antiferromagnetic (afm) long range ordering. Between 60 and 85 K themagnetic reflections broaden beyond instrumental resolution and the propagation vectorbecomes incommensurate. Above K magnetic scattering is only seen as a diffuse ridge which we ascribe to short-rangecorrelations within the triangular Tb atom planes. With decreasing temperature anadditional Lorentzian shaped reflection grows on top of the decaying edge of this diffuseridge. We analyse the diffuse scattering by fitting a Warren-type lineshape and aLorentzian shaped Bragg reflection. The results of the fits indicate that, with divergingintra-plane correlations, significant inter-plane afm correlations build up close to 85 K.Above 95 K inter-plane correlations are essentially limited to nearest-neighbour Tb atomdouble layers only.
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