ESR Study of Cr^<3+> Doped LiNH_4C_4H_4O_6・H_2O (LAT)

概要

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Electron spin resonance experiments of Cr^<3+> doped LiNH_4C_4H_4O_6・H_2O (LAT) single crystals were carried out. Two kinds of Cr^<3+> sites were observed. The spin Hamiltonian parameters in its paraelectric phase were determined as |D|=38.39×10^<-3>cm^<-1>, |E|=3.03×10^<-3>cm^<-1> for A-site and |D|=47.54×10^<-3>cm^<-1>, |E|=5.96×10^<-3>cm^<-1> for B-site The resonance lines split continuously and smoothly just below the transition temperature. These splitting can be reasonably explained by considering the symmetry change associated with the phase transition and the formation of the domains. Electric field and shear stress Z_x dependence of ESR lines were measured at a temperature lower than the Curie point, by about 10 K. It was confirmed that the spontaneous polarization can be reversed not only by applying the electric field but also by applying the shear stress Z_x. This indicates that LAT is both ferroelectric and ferroelastic below the transition temperature.
社団法人日本物理学会の論文
1975-11-15