Spin-phonon coupling in scandium doped gallium ferrite

Chakraborty, Keka R. ; Paul, Barnita ; Grover, Vinita ; Mukadam, M. D. ; Roy, Anushree ; Basu, S. ; Tyagi, A. K. ; Yusuf, S. M. (2015) Spin-phonon coupling in scandium doped gallium ferrite Journal of Applied Physics, 117 (12). Article ID 123915. ISSN 0021-8979

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Official URL: http://aip.scitation.org/doi/abs/10.1063/1.4916602

Related URL: http://dx.doi.org/10.1063/1.4916602


We embarked on a study of Scandium (Sc) doped (onto Ga site) gallium ferrite (GaFeO3) and found remarkable magnetic properties. In both doped as well as parent compounds, there were three types of Fe3+ ions (depending on the symmetry) with the structure conforming to space group Pna21 (Sp. Grp. No. 33) below room temperature down to 5 K. We also found that all Fe3+ ions occupy octahedral sites, and carry high spin moment. For the higher Sc substituted sample (Ga1−xScxFeO3: x = 0.3), a canted magnetic ordered state is found. Spin-phonon coupling below Néel temperature was observed in doped compounds. Our results indicated that Sc doping in octahedral site modifies spin-phonon interactions of the parent compound. The spin-phonon coupling strength was estimated for the first time in these Sc substituted compounds.

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