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 language | English |
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Pages (from-to) | 653-659 |
Number of pages | 7 |
Journal | Europhysics Letters |
Volume | 61 |
Issue number | 5 |
DOIs | |
State | Published - 2003 |
Externally published | Yes |