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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 NÃ©el 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.
Betancourth, D., V. F. Correa, and D. J. García. "Evidence of a Low Energy Anisotropy in GdCoIn_5." Journal of Low Temperature Physics 179, no. 1-2 (2015): 90–93.
Abstract: We investigate the effects of an applied magnetic field on the magnetic properties of the antiferromagnet GdCoIn 5 . The prominent anisotropy observed in the susceptibility below TN is rapidly suppressed by a field of just a few Tesla. Further evidence of this low energy-scale is obtained from magnetoresistance and magnetostriction experiments. The lattice length, particularly, shows a sudden change below 2 T when the magnetic field is applied perpendicular to the crystallographic c^ -axis.