- Abstract:
-
We present new results on the microscopic nature of the ferroelectricity mechanisms in Ca3 Mn2O7 and Ca3Ti2O7. To the first approximation, we confirm the hybrid improper ferroelectric mechanism recently proposed by Benedek and Fennie for these Ruddlesden-Popper compounds. However, in Ca3Mn2O7 we find that there is a complex competition between lattice modes of different symmetry which leads to a phase coexistence over a large temperature range and the "symmetry trapping" of a soft mode. This ...
Expand abstract - Publication status:
- Published
- Peer review status:
- Peer reviewed
- Version:
- Publisher's version
- Files:
-
-
(pdf, 380.1KB)
-
- Publisher copy:
- 10.1103/PhysRevLett.114.035701
-
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- Publisher:
- American Physical Society Publisher's website
- Journal:
- Physical review letters Journal website
- Volume:
- 114
- Issue:
- 3
- Pages:
- 035701
- Chapter number:
- ARTN 035701
- Publication date:
- 2015-01-22
- DOI:
- EISSN:
-
1079-7114
- ISSN:
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0031-9007
- URN:
-
uuid:618ee7f2-2830-4133-aa61-f0b28425e32b
- Source identifiers:
-
506095
- Local pid:
- pubs:506095
- Paper number:
- 3
- Language:
- English
- Keywords:
- Copyright holder:
- American Physical Society
- Copyright date:
- 2015
- Notes:
- This is the publisher's version of a journal article published by The American Physical Society in Physical Review Letters on 2015-03-07, available online: http://dx.doi.org/10.1016/j.ultramic.2015.03.005
Journal article
Negative thermal expansion in hybrid improper ferroelectric Ruddlesden-Popper perovskites by symmetry trapping
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