作者: S. Miga , J. Dec , A. Molak , M. Koralewski
DOI: 10.1063/1.2206267
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摘要: The results of measurements the linear and nonlinear dielectric susceptibilities a lead germanate, Pb5Ge3O11, single crystal are presented. change in sign third-order susceptibility χ3 as predicted by thermodynamic theory continuous phase transitions is confirmed experimentally. Both temperature independence, within range T⩽TC+8K above transition point, nonlinearity coefficient B confirm that germanate belongs to Landau universality class.