Direct Observation of Orbital Ordering inLa0.5Sr1.5Mn

Abstract

. (2003) 'Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diraction. ', Physical review letters., 91 (16 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

Crystal and magnetic structure ofLa1−xSr1+xMnO4: Role of the orbital degree of freedom

“…2, disappears, and rather complex schemes of charge, orbital and magnetic order appear, amongst which that of the half-doped composition is best studied. 4,5,6,7,8 The single crystal of composition La 0.75 Sr 1.25 MnO 4 studied here does not show the superstructure peaks indexed by (h/2 k/2 l) but magnetic scattering at an incommensurate q-position (0.5,0.16,0), which one may not relate with the simple commensurate magnetic ordering. 18 With the diffraction techniques used here, we are not able to study the structural distortion arising from the charge and orbital order, we may only discuss the average crystal structure.…”

Spatially modulated 'Mottness' in La2-xBaxCuO4

“…(2p 3/2 → 3d x2−y2 ) edges, which provide direct sensitivity to valence electron ordering [14][15][16][17][18][19][20] .…”

“…So, in the neutron Bragg peaks alone there is no clear difference between the phenomenon in LNSCO and a simple spin-density wave. To determine whether the doped holes are actually involved we have studied LBCO with RSXS near the O K (1s → 2p) and Cu L 3/2 (2p 3/2 → 3d x2−y2 ) edges, which provide direct sensitivity to valence electron ordering [14][15][16][17][18][19][20] .Single crystals of La 2−x Ba x CuO 4 with x = 1/8 were grown by the floating-zone method 21 . The sample used in this study had T c = 2.5 K indicating suppressed superconductivity and stabilized spin/charge order.…”

Light control of orbital domains: case of the prototypical manganite La0.5Sr1.5MnO4

“…This new form of electronic order can be seen with resonant diffraction, which is capable of diffracting from the new long range order. This is particularly true when the X-ray energy is tuned to the L-edge absorption resonance of the Mn ion as the X-rays directly probe the d states involved in orbital ordering 16,17 . However, it should be noted that 100% charge localization is unlikely and the charge disproportionation is significantly smaller in reality.…”