Chatterji, Tapan ; Fauth, François ; Ouladdiaf, Bachir ; Mandal, P. ; Ghosh, B. (2003) Volume collapse in LaMnO3 caused by an orbital order-disorder transition Physical Review B, 68 (5). ISSN 0163-1829
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Official URL: http://doi.org/10.1103/PhysRevB.68.052406
Related URL: http://dx.doi.org/10.1103/PhysRevB.68.052406
Abstract
We have investigated the Jahn-Teller transition accompanied by the orbital order-disorder transition in LaMnO3 by high temperature x-ray powder diffraction with synchrotron radiation and also neutron powder diffraction. The unit cell volume of LaMnO3 decreases with increasing temperature in a narrow temperature range below TJT ≈ 750 K , and then undergoes a volume collapse at TJT . We interpret this effect as due to the more efficient packing of the MnO6 octahedra in the orbitally disordered or orbital liquid state. The orbital melting phenomenon can be qualitatively compared with the melting of ice.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 122874 |
| Deposited On: | 25 Aug 2021 07:48 |
| Last Modified: | 25 Aug 2021 07:48 |
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