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Carreras Oropesa, W. G., V. F. Correa, J. G. Sereni, D. J. García, and P. S. Cornaglia. "Landau theory for magnetic and structural transitions in CeCo0.85Fe0.15Si." Journal of Physics: Condensed Matter 30 (2018): 295803.
Abstract: We present a phenomenological analysis of the magnetoelastic properties of CeCo0.85Fe0.15Si
at temperatures close to the Néel transition temperature TN. Using a Landau functional we
provide a qualitative description of the thermal expansion, magnetostriction, magnetization
and specific heat data. We show that the available experimental results (Correa et al 2016 J.
Phys.: Condens. Matter 28 346003) are consistent with the presence of a structural transition
at Ts TN and a strong magnetoelastic coupling. The magnetoelastic coupling presents a
Janus-faced effect: while the structural transition is shifted to higher temperatures as the
magnetic field is increased, the resulting striction at low temperatures decreases. The strong
magnetoelastic coupling and the proximity of the structural transition to the onset temperature
for magnetic fluctuations, suggest that the transition could be an analogue of the tetragonal to
orthorhombic observed in Fe-based pcnictides.
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