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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/1382
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| Title: | Magnetic and electronic Co states in the layered cobaltate GdBaCo2O5.5-x. |
| Authors: | Garcia-Fernandez, M Scagnoli, V Staub, U Mulders, AM Janousch, M Bodenthin, Y Meister, D Patterson, BD Mirone, A Tanaka, Y Nakamura, T Grenier, S Huang, YJ Conder, K |
| Keywords: | Scattering Diffraction High Spin States Magnetic Moments X-Ray Sources Electronic Structure |
| Issue Date: | Aug-2008 |
| Publisher: | American Physical Society |
| Citation: | Garcia-Fernandez, M., Scaunoli, V., Staub, U., Mulders, A. M., Janousch, M., Bodenthin, Y., et al. (2008). Magnetic and electronic Co states in the layered cobaltate GdBaCo2O5.5-x. Physical Review B, 78(5), 13. |
| Abstract: | We have performed nonresonant x-ray diffraction, resonant soft and hard x-ray magnetic diffraction, soft x-ray absorption, and x-ray magnetic circular dichroism measurements to clarify the electronic and magnetic high-spin (HS) state at the states of the Co3+, ions in GdBaCo2O5.5. Our data are consistent with a Co-Py(3+) pyramidal sites and a Co-Oc(3+), low-spin (LS) state at the octahedral sites. The structural distortion with a doubling of the a axis (2a(p)X2a(p)X2a(p) cell) shows alternating elongations and contractions of the pyramids, and indicates that the metal-insulator transition is associated with orbital order in the t(2g) orbitals of the Co-Py(3+) HS state. This distortion corresponds to an alternating ordering of xz and yz orbitals along the a and c axes for the Co-Py(3+). The orbital ordering and pyramidal distortion lead to deformation of the octahedra but the Co-Oc(3+) LS state does not allow an orbital order to occur for the Co-Oc(3+), ions. The soft x-ray magnetic diffraction results indicate that the magnetic moments are aligned in the ab plane but are not parallel to the crystallographic a or b axes. The orbital order and the doubling of the magnetic unit cell along the c axis support a noncollinear magnetic structure. The x-ray magnetic circular dichroism data indicate that there is a large orbital magnetic contribution to the total ordered Co moment. © 2008, American Physical Society |
| URI: | http://dx.doi.org/10.1103/PhysRevB.78.054424 http://apo.ansto.gov.au/dspace/handle/10238/1382 |
| ISSN: | 1098-0121 |
| Appears in Collections: | Journal Articles |
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