Ergodicity breaking in stronium calcium titanate

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Lacerda Aroso, MT (Author) Other; Ribeiro, JL (Author) Other; Chaves, MR (Author) FCUP; Almeida, BG (Author) Other; Almeida, A (Author) FCUP

Journal

Title: Journal of Physics Condensed Matter

Vol. 13

Pages: 2615-2626

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-000-W35

DOI: 10.1088/0953-8984/13/11/317

Abstract (EN): This work reports experimental results obtained from series of measurements of pyroelectric currents in samples of strontium calcium titanate (SCT) corresponding to contents of Ca of x = 0.002, x = 0.005 and x = 0.011. Sequences of zero field cooling (zfc), field heating (fh), field cooling (fc) and zero field heating (zfh) runs, under different applied electric fields, allowed the observation of the temperature and field dependence of the electric polarization under different initial conditions. The results show the existence of a weak nonergodic regime in the compositions x = 0.005 and x = 0.011 and allow the tracing of the corresponding Almeida-Thouless line in the T-E diagram. For the three compositions investigated, a small zero field polarization is detected and interpreted as due to defect induced internal fields.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12