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Correlations Between the Magnetic and Structural Properties of Ca Doped BiMnO3



H Woo, T A. Tyson, Mark Croft, S W. Cheong, Joseph Woicik


Bi1-xCaxMnO3 (BCMO) is known to exhibit charge ordering for a much broader range of x than the classicLa1-xCaxMnO3 (LCMO) system. However, the properties of BCMO over the entire doping range are not well understood. We have performed magnetization and resistivity measurements as well as x-ray absorption and x-ray diffraction (XRD) measurements, on BCMO to correlate transport, structural and magnetic properties. The BCMO system is insulating and antiferromagnetic (AF) for the entire range of x studied (x > 0.4) except near x 0.9 where we find a canted spin arrangement with approximately one Bohr magneton per Mn site. Detailed magnetization measurement was performed as a function of field and temperature to explore the net moment on the Mn sites as a function of x and reveal the charge ordering and N el temperatures. X-ray absorption measurements reveal significant structural distortion in the Mn-O bond distributions with increasing Bi content which correlates directly with increasing charge ordering temperatures. Moreover, the x-ray diffraction data reveal splittings consistent with lower symmetry cells as Bi content increases. These structural-magnetic correlations point to the importance of Mn-O distortions in stabilizing the charge ordered state in the manganites.
Physical Review B (Condensed Matter and Materials Physics)
No. 13


antiferromagnetic, Bi<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub>(BCMO), La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub>(LCMO), x-ray diffraction (XRD)


Woo, H. , Tyson, T. , Croft, M. , Cheong, S. and Woicik, J. (2001), Correlations Between the Magnetic and Structural Properties of Ca Doped BiMnO<sub>3</sub>, Physical Review B (Condensed Matter and Materials Physics) (Accessed March 4, 2024)
Created March 31, 2001, Updated October 12, 2021