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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 Ca3Mn2O7 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...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1103/PhysRevLett.114.035701

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Department:
Inorganic Chemistry
Alessandro Bombardi More by this author
Claire A. Murray More by this author
Antonella Scherillo More by this author
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Grant:
DE-FG02-07ER46382
Funding agency for:
Project
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Grant:
2011-0031558
Funding agency for:
Project
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review Letters
Volume:
114
Issue:
3
Publication date:
2015-01-22
Acceptance date:
2014-12-12
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Source identifiers:
035701
Language:
English

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