Abstract
Zero-field heating (ZFH) susceptibility after zero-field cooling (ZFC) and field cooling (FC) of highly diluted single crystalline sample of K0.995Li0.005TaO3, KLT(005) was measured in order to check, if such composition undergoes a collective dipolar glassy freezing. The results are compared with that obtained for the typical glassy system K0.989Li0.011TaO3, KLT(011). It is concluded that the highly dilute KLT(005) compound does not bear convincing features typical of collective dipolar glassy freezing. It is proposed that the low-temperature state of KLT(005) may be considered as a quantum superparaelectric one that may be toggled into an improper ferroelectric while applying an electric field.
Acknowledgments
Work was supported by the Foundation for Polish Science (FNP) with an Alexander-von-Humboldt Honorary Research Grant.