Inversion symmetry breaking by oxygen octahedral rotations in the Ruddlesden-Popper NaRTiO4 family.

Akamatsu, Hirofumi; Fujita, Koji; Kuge, Toshihiro; Sen Gupta, Arnab; Togo, Atsushi; Lei, Shiming; Xue, Fei; Stone, Greg; Rondinelli, James M; Chen, Long-Qing; Tanaka, Isao; Gopalan, Venkatraman; Tanaka, Katsuhisa

Akamatsu, Hirofumi; Fujita, Koji; Kuge, Toshihiro; Sen Gupta, Arnab; Togo, Atsushi; Lei, Shiming; Xue, Fei; Stone, Greg; Rondinelli, James M; Chen, Long-Qing; Tanaka, Isao; Gopalan, Venkatraman; Tanaka, Katsuhisa.

Afiliação

Akamatsu H; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Fujita K; Department of Material Chemistry, Kyoto University, Nishikyo, Kyoto 615-8510, Japan.
Kuge T; Department of Material Chemistry, Kyoto University, Nishikyo, Kyoto 615-8510, Japan.
Sen Gupta A; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Togo A; Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan.
Lei S; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Xue F; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Stone G; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Rondinelli JM; Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.
Chen LQ; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Tanaka I; Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan.
Gopalan V; Materials Research Institute and Department of Materials Science and Engineering, Pennsylvania State University, MSC Building, University Park, Pennsylvania 16802, USA.
Tanaka K; Department of Material Chemistry, Kyoto University, Nishikyo, Kyoto 615-8510, Japan.

Phys Rev Lett ; 112(18): 187602, 2014 May 09.

Article em En | MEDLINE | ID: mdl-24856722

ABSTRACT

ABSTRACT

Rotations of oxygen octahedra are ubiquitous, but they cannot break inversion symmetry in simple perovskites. However, in a layered oxide structure, this is possible, as we demonstrate here in A-site ordered Ruddlesden-Popper NaRTiO4 (R denotes rare-earth metal), previously believed to be centric. By revisiting this series via synchrotron x-ray diffraction, optical second-harmonic generation, piezoresponse force microscopy, and first-principles phonon calculations, we find that the low-temperature phase belongs to the acentric space group P42(1)m, which is piezoelectric and nonpolar. The mechanism underlying this large new family of acentric layered oxides is prevalent, and could lead to many more families of acentric oxides.

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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Estados Unidos

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