Volume 101, Number 6, March 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 March 2013|
Phase precipitation in the Bi1−xCaxMnO3 compounds (x = 0.4–0.6)
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, PRC
2 School of Materials Science and Engineering, Guilin University of Electronic Technology Guilin 541004, Guangxi, PRC
3 NIST Center for Neutron Research, National Institute of Standards and Technology Gaithersburg, MD 20899-8562, USA
Received: 10 December 2012
Accepted: 25 February 2013
Charge ordering (CO) in Bi1−xCaxMnO3 (x = 0.4–0.6) has been investigated by temperature-dependent high-resolution neutron powder diffraction (NPD), X-ray powder diffraction (XRD) and physical property measurements. Anomalies in magnetization, resistivity and lattice parameters have been observed around the CO transition temperature (TCO) reported in the literature. However, a scrutiny of the NPD and XRD data at different temperatures and the electron diffraction experiments at 300 K give no evidence of a long-range CO below the reported TCO. Instead, NPD and XRD reveal a coexistence of two orthorhombic phases in the samples below the reported TCO. All the experiments suggest that one of the coexisting phases is originated from a precipitation or an incomplete structural transition of the other phase and the reported TCO corresponds to the precipitation reaction or structural transition temperature, rather than a CO transition temperature.
PACS: 75.25.Dk – Orbital, charge, and other orders, including coupling of these orders / 71.30.+h – Metal-insulator transitions and other electronic transitions / 64.75.Qr – Phase separation and segregation in semiconductors
© EPLA, 2013
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