Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-03-28
Physical Review B 81, 5 (2010) 054416
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
The Fe-based langasites are the first reported compounds presenting a magnetic ordering in this rich family, besides being well known for piezo-electric properties and optical activity. The structural, magnetic and dielectric properties of the Fe langasite compounds, with various substitution of non-magnetic cations, have been studied with x-ray and neutron diffraction, magnetostatic measurements, M\"ossbauer spectroscopy, and dielectric measurements. The title compounds (trigonal, space group P321) display a helical magnetic order with signatures of frustration below TN ~24- 35 K where an anomaly of the dielectric permittivity is observed. The influence of the cationic substitutions and the nature of the magnetoelectric coupling is hereafter addressed.
Ballou Rafik
Bonville Pierre
Bordet Pierre
Darie Céline
Isnard Olivier
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