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Negative thermal expansion in hybrid improper ferroelectric Ruddlesden-Popper perovskites by symmetry trapping

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 ...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.1103/PhysRevLett.114.035701

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Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Inorganic Chemistry
Role:
Author
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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:
0031-9007
URN:
uuid:618ee7f2-2830-4133-aa61-f0b28425e32b
Source identifiers:
506095
Local pid:
pubs:506095
Paper number:
3
Language:
English
Keywords:

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