Ferroelectricity driven by Y d0-ness with rehybridization in YMnO3

被引：119

作者：

Cho, D.-Y.

Kim, J.-Y.

Park, B.-G.

Rho, K.-J.

Park, J.-H. ^{[1
]}

Noh, H.-J.

Kim, B. J.

Oh, S.-J.

Park, H.-M.

Ahn, J.-S.

Ishibashi, H.

Cheong, S-W.

Lee, J. H.

Murugavel, P.

Noh, T. W.

Tanaka, A.

Jo, T.

机构：

[1] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea

[2] Seoul Natl Univ, CSCMR, Seoul 151747, South Korea

[3] Seoul Natl Univ, Sch Phys & Astron, Seoul 151747, South Korea

[4] Pohang Univ Sci & Technol, ESSC, Pohang 790784, South Korea

[5] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[6] Korea Res Inst Stand & Sci, Yusong 305600, South Korea

[7] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[8] Seoul Natl Univ, ReCOE, Seoul 151747, South Korea

[9] Seoul Natl Univ, Sch Phys & Astron, Seoul 151747, South Korea

[10] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398526, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.98.217601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigated electronic structure of hexagonal multiferroic YMnO3 using the polarization dependent x-ray absorption spectroscopy (XAS) at O K and Mn L-2,L-3 edges. The spectra exhibit strong polarization dependence at both edges, reflecting anisotropic Mn 3d orbital occupation. Moreover, the O K edge spectra show that Y 4d states are strongly hybridized with O 2p ones, resulting in large anomalies in Born effective charges on off-centering Y and O ions. These results manifest that the Y d(0)-ness with rehybridization is the driving force for the ferroelectricity, and suggest a new approach to understand the multiferroicity in the hexagonal manganites.

引用

页数：4

共 24 条

[1]

[Anonymous], HDB PHYS

[2] Comparison of electronic structures of orthorhombic and hexagonal manganites studied by X-ray absorption spectroscopy [J].