Electron Spin Resonance of Fe^<3+> in SrTiO_3 with Special Reference to the 110°K Phase Transition
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The electron spin resonarice of F^<3+> in single crystals of SrTiO_3 has been studied in the low temperature phase below 110°K. The resopance lines exhibited small splitting in addition to the usual tetragonal splitting. The orientation dependence of the splitting was measured at 77°K and at 4.2°K. The whole spectrum is explained to be due to the rotation of oxygen octahedron in the (100) plane, the angle of rotation being 1.4° at 77°K and 2.1° at 4.2°K. Corresponding splitting was also observed for the case of the 'strong axial field' spectrum due to Fe^<3+> accompanied by the nearest neighbor oxygen vacancy. The observed angles of rotation are about 30 percent smaller than those of the former case. The crystal structure deduced from the atomic positions of oxygen ions will be D4^<16>_<4h> in the low temperature phase. Correlation with the resonance data of Gd^<3+> in SrTiO_3 is discussed.
- 社団法人日本物理学会の論文
- 1967-09-05
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