Publications by Roger Johnson

Soft x-ray diffraction from lattice constrained orbital order in Pr(Sr<inf>0.1</inf>Ca<inf>0.9</inf>)<inf>2</inf>Mn<inf>2</inf>O<inf>7</inf>

Journal of Physics: Conference Series 211 (2010)

TAW Beale, SR Bland, RD Johnson, PD Hatton, JC Cezar, SS Dhesi, D Prabhakaran, AT Boothroyd

Controlling orbital occupancy is a fundamental prerequisite for orbitronics. It has been shown in the orthorhombic bilayer manganite Pr(Sr 0.1 Ca 0.9 ) 2 Mn 2 O 7 that the direction of orbital order stripes can be influenced by controlling temperature or through inducing strain in the material. In this paper we have used resonant soft x-ray diffraction at the Mn L-edge to confirm the rotation of the orbital direction T OO2 and furthermore prove that there is no change in the occupied orbital type, however the orbital rotation causes a switch from 3x 2 -r 2 to 3y 2 -r 2 on a single site. We find that unlike the tetragonal bilayer manganites, where an onset of A-type AFM quenches the orbital order, no such effect is found on the orbital order below T N . © 2010 IOP Publishing Ltd.

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