Electron Spin Resonance of Gd^<3+> in Reduced BaTiO_3

概要

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Electron spin resonance (ESR) of trivalent gadolinium in reduced barium titanate has been observed at room temperature and 163℃ with an X-band spectrometer. According to this temperature rise, the amount of Gd^<3+> ions substituting Ti^<4+> remarkably increased in BaTi0_3 reduced at 1300℃, while those substituting Ba^<2+> decreased. The local symmetry of the crystalline field acting on Gd^<3+> at the Ti^<4+> site is cubic. Hence the observed spectrum was analyzed using a spin Hamiltonian TL=gβH^^-・S^^-+b_4^0[Y_4^0+√<70>/<14> (Y_4^4+Y_4^<-4>]+b_3^0[Y_6^0-√<14>/2(Y_6^4+y_6^<-4>)] where g, b_4^0 and b_6^0 are 1.992,26±1 and -4±3 gauss, respectively, at room temperature and 1.992,25.0±0.5 and -1.9±0.5 gauss at 163℃ (above Curie temperature).
社団法人日本物理学会の論文
1966-06-05