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Phys. Rev. B 72, 012414 (2005) [4 pages]

Photomagnetic effect in a single crystal of the bilayer manganite La1.2Sr1.8Mn2O7

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B. C. Zhao, W. H. Song, Z. G. Sheng, and J. M. Dai
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

Q. A. Li
State Key Laboratory of Magnetism, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China

Y. P. Sun*
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, People’s Republic of China

Received 27 September 2004; revised 14 April 2005; published 21 July 2005

The photomagnetic effect is investigated on a bilayered single crystal La1.2Sr1.8Mn2O7 manganite. The magnetization (M) enhancement induced by the laser (λ=532 nm) irradiation is observed in the whole studied temperature region. The increase of M is evaluated up to 10% and 15% by the light irradiation with laser power density 1.1 mW mm−2 at 30 and 200 K, respectively. The three-dimensional (3D) ferromagnetic (FM) transition temperature TC is remarkably reduced under the light irradiation and the two-dimensional (2D) FM correlation temperature T* within the Mn-O bilayer is almost not affected by the light irradiation. The observed photomagnetic effect can be explained based on the photoinduced charge-transfer (CT) from O-2p (pz) to Mn4+-3d eg(d3z2−r2) orbital state.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.012414
DOI:
10.1103/PhysRevB.72.012414
PACS:
75.47.Gk, 71.27.+a, 75.90.+w, 72.80.Ga

*Corresponding author. Electronic address: ypsun@issp.ac.cn

 
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