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Thermally induced rotation of 3d orbital stripes in Pr(Sr0.1Ca0.9)2Mn2O7.

Beale, T.A.W. and Bland, S.R. and Johnson, R.D. and Hatton, P.D. and Cezar, J.C. and Dhesi, S.S. and Zimmermann, M.V. and Prabhakaran, D. and Boothroyd, A.T. (2009) 'Thermally induced rotation of 3d orbital stripes in Pr(Sr0.1Ca0.9)2Mn2O7.', Physical review B., 79 (5). 054433.

Abstract

We have investigated orbital ordering in the bilayer manganite, Pr(Sr0.1Ca0.9)2Mn2O7, using synchrotron x-ray diffraction techniques, in particular resonant soft x-ray diffraction. Diffraction signals are observed at (0,1/2,0) above 300 K and (1/2,0,0) below 300 K, corresponding to orbital stripes along the a and b axes, respectively. The previously observed transition at 300 K is evidence of a rotation of the orientation of the 3d orbital stripes. Large resonances of the orbital signals are observed at the Mn L edges, with a complex dependence on incident photon energy indicative of a weakly Jahn-Teller distorted system. A structural transition observed at 92 K is found not to involve a further change in the orbital order.

Item Type:Article
Keywords:Charge, Manganites, LA0.5SR1.5MNO4, LA2-2XSR1+2XMN2O, State.
Full text:PDF - Published Version (291Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1103/PhysRevB.79.054433
Publisher statement:© 2009 The American Physical Society
Record Created:27 Nov 2012 11:35
Last Modified:27 Nov 2012 12:04

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