CRITICAL EXPONENTS AND RANDOMNESS IN SRTIO3CA

• Type: Article in International Scientific Journal
• Date: 1994

Authors

MAGLIONE, M (Author) Other; DOSSANTOS, ML (Author) Other; Chaves, MR (Author) FCUP; Almeida, A (Author) FCUP

Journal

Title: Physica Status Solidi (B): Basic Research

Vol. 181

Pages: 73-80

ISSN: 0370-1972

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 16 Citations

Other information

Authenticus ID: P-001-M0B

DOI: 10.1002/pssb.2221810108

Abstract (EN): Since its discovery, the SrTiO3:Ca system is known to exhibit a number of features which were thought to arise from an impurity induced disorder. Non-linear dielectric measurements are used to obtain a more quantitative insight into this disorder. For 0.001 < x(Ca) < 0.05, it is found that the non-linear susceptibility diverges at low temperatures. This is similar to what was previously reported in the dielectric random system KTaO3:Na. A method is proposed to quantify the contribution of the disorder to the non-linearities. It is found that the deviation from a true ferroelectric behaviour is not enough to call the low-temperature phase of SrTiO3:Ca a glass one. The maximum non-linearity observed for x(Ca) = 0.003 and 0.004 decreases for higher x(Ca) contents. It is shown that a simple model of temperature dependent dipole moment may account for both the linear and non-linear dielectric behaviour of SrTiO3:Ca.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8