Temperature Dependence of Surface Polar State of SrTiO3 Ceramics Obtained by Piezoresponse Force Microscopy

abstract

The existence of polar state on the surface of strontium titanate ceramics was obtained by piezoresponse force microscopy (PFM) in temperature range from 8 to 295K. This polar state is nonswitchable and relaxes fast at room temperature. This fact is attributed to charge injection from tip, which provoked the formation of oxygen vacancies in subsurface layer. Low temperature dynamics of surface piezoresponse reveals an increasing of PFM contrast at 110-130K, associated with surface structural phase transition. Temperature dependence of the average level of piezoresponse signal exhibits two peaks due to bulk structural phase transition and coherent quantum state.

keywords

QUANTUM PARAELECTRIC REGIME; STRONTIUM-TITANATE; FERROELECTRICITY; INTERFACE; PHASE

subject category

Materials Science; Physics

authors

Andreeva, N; Alikin, D; Turygin, A; Kholkin, AL; Shur, VY; Filimonov, A; Lessovaia, S

our authors

acknowledgements

The research was made possible in part by Ministry of Education and Science of Russian Federation (grant No. 14.594.21.0011). The work was performed under the government order of the Ministry of Education and Science of Russia.

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