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Charge ordering and structural distortions at low temperature in La2-2xSr1+2xMn2O7 (x=0.475 and 0.5).

Wilkins, S. B. and Spencer, P. D. and Beale, T. A. and Hatton, P. D. and Zimmermann, M. V. and Brown, S. D. and Prabhakaran, D. and Boothroyd, A. T. (2003) 'Charge ordering and structural distortions at low temperature in La2-2xSr1+2xMn2O7 (x=0.475 and 0.5).', Physical review B., 67 (20). p. 205110.


In this paper we present x-ray scattering results of charge and orbital ordering in the bilayer manganite La222xSr112xMn2O7 with doping levels x50.5 and x50.475. Using high-energy x-ray scattering, the structural modulation due to the Jahn-Teller ordering and the charge ordering due to the Mn31/Mn41 pattern have been measured. Both the x50.5 and x50.475 samples are found to display charge and Jahn-Teller order. We have confirmed that the wave vectors of the Jahn-Teller order, charge order, and orbital order are QW 5(0.25,0.25,0), QW 5(0.5,0.5,0) and QW 5(0.25,0.25,0). The origin of these has been confirmed by resonant x-ray scattering in the vicinity of the Mn K edge using polarization analysis. Contrary to previous studies, the Jahn-Teller order is found to be not reentrant, but is found to reduce in intensity at temperatures below 140 K for both samples. Charge ordering was also detected in the x50.5 sample below this temperature.

Item Type:Article
Keywords:X-ray-scattering, Giant magnetoresistance, Manganese oxides, l LASR2MN2O7, Manganites, Diffraction, Transition, Beamline, Behavior.
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Publisher statement:© 2003 by The American Physical Society. All rights reserved.
Record Created:09 Jan 2009
Last Modified:19 Oct 2010 10:33

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