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: email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.