期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.187602
关键词
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资金
- Japan Synchrotron Radiation Research Institute (JASRI) [2011B1504, 2013A1683]
- Japan Society of the Promotion of Science (JSPS) Fellowship [22-1280]
- JSPS Fellowship for Research Abroad [25-185]
- National Science Foundation (NSF) through Materials Research Science and Engineering Centers (MRSEC) [DMR-0820404, DMR-1210588]
- [25249090]
- Grants-in-Aid for Scientific Research [25249090, 26106514] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210588] Funding Source: National Science Foundation
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 P(4) over bar 2(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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