Observation of a sample-dependent 37 K anomaly on the lattice parameters of strontium titanate

L. Arzel*, B. Hehlen, F. Dénoyer, R. Currat, K. D. Liss, E. Courtens

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The lattice parameters of tetragonal strontium titanate are determined to about 1 part in 106 with penetrating X-rays. While no peculiarity is detected in a bulk sample, a distinct anomaly at 37 K is observed in an optically polished thin platelet derived from the same single crystal. This suggests that the anomaly is related to a high density of dislocations. A possible mechanism is that dislocations stabilize transverse antiphase boundaries which undergo a ferroelectrie transition near 37 K. If so, this transition stresses the boundaries which then strain the bulk leading to the observed anomaly.

Original languageEnglish
Pages (from-to)653-659
Number of pages7
JournalEurophysics Letters
Volume61
Issue number5
DOIs
StatePublished - 2003
Externally publishedYes

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