Granado, E. ; Huang, Q. ; Lynn, J. W. ; Gopalakrishnan, J. ; Ramesha, K. (2004) Crystal structures and magnetic order of La0.5+δA0.5-δ:Mn0.5+εRu0.5-εO3 (A= Ca, Sr, Ba): possible orbital glass ferromagnetic state Physical Review B: Condensed Matter and Materials Physics, 70 (21). 21441_1-21441_7. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v70/i21/e214416
Related URL: http://dx.doi.org/10.1103/PhysRevB.70.214416
Abstract
The crystallographic and magnetic properties of La0.5+δA0.5-δMn0.5+εRu0.5-εO3 (A= Ca, Sr, Ba) were investigated by means of neutron powder diffraction. All studied samples show the orthorhombic perovskite crystal structure, space group Pnma, with regular (Mn,Ru)O6 octahedra and no chemical ordering of the Mn3+ and Ru4+ ions. Ferromagnetic spin structures were observed below Tc ~ 200-250 K, with an average ordered moment of ~ 1.8-2.0µB(Mn,Ru). The observation of long-range ferromagnetism and the absence of orbital ordering are rationalized in terms a strong Mn-Ru hybridization, which may freeze the orbital degree of freedom and broaden the eg valence band, leading to an orbital-glass state with carrier-mediated ferromagnetism.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 84289 |
| Deposited On: | 24 Feb 2012 15:35 |
| Last Modified: | 24 Feb 2012 15:35 |
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