Volume 86, Number 6, June 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 July 2009|
A “checkerboard" orbital-stripe phase and charge ordering transitions in Pr(SrxCa)Mn2O7 (0 x 0.45)
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100080, China
2 Department of Communication Engineering, School of Information Engineering, University of Science and Technology Beijing 100083, China
Corresponding author: firstname.lastname@example.org
Accepted: 2 June 2009
The charge/orbital ordering (COO) behaviors in the double-layered Pr(SrxCa)Mn2O7 have been investigated by in situ transmission electron microscopy (TEM) observations. The experimental results reveal that two charge ordering (CO) phase transitions, so-called and , commonly exist in the orthorhombic Pr(SrxCa)Mn2O7 (0 x 0.45) samples. Moreover, a “checkerboard" orbital-stripe phase characterized by two orthogonal COO modulations, and , is observed between and in all samples. Detailed TEM investigations on the sample, in which a visible electric polarization was found (Tokunaga Y. et al., Nat. Mater., 5 (2006) 937) demonstrate that the modulation only survives between and , and the “checkerboard” phase transforms into the conventional one-dimensional COO stripe phase below . The reversal of in-plane optical anisotropy across the transition (Tokunaga Y. et al., Nat. Mater., 5 (2006) 937) is also explained based on TEM result.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions / 61.05.J- – Electron diffraction and scattering
© EPLA, 2009
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