Phase transitions and iron-ordered moment form factor in LaFeAsO
Source: Phys. Rev. B 82, 064409 (2010); doi:10.1103/PhysRevB.82.064409
Published 9 August 2010
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Elastic neutron-scattering studies of single-crystal LaFeAsO reveal that upon cooling, an onset of the tetragonal (T)-to-orthorhombic (O) structural transition occurs at TS![[approximate]](http://scitation.aip.org/stockgif3/ap.gif)
156 K, and it exhibits a sharp transition at TP148 K. We argue that in the temperature range TS to TP, T and O structures may dynamically coexist possibly due to nematic spin correlations recently proposed for the iron pnictides, and we attribute TP to the formation of long-range O domains from the finite local precursors. The antiferromagnetic structure emerges at TN140 K, with the iron moment direction along the O a axis. We extract the iron magnetic form factor and use the tabulated 
j0
of Fe, Fe2+, and Fe3+ to obtain a magnetic moment size of ~0.8 µB at 9.5 K.
©2010 The American Physical Society
156 K, and it exhibits a sharp transition at TP148 K. We argue that in the temperature range TS to TP, T and O structures may dynamically coexist possibly due to nematic spin correlations recently proposed for the iron pnictides, and we attribute TP to the formation of long-range O domains from the finite local precursors. The antiferromagnetic structure emerges at TN140 K, with the iron moment direction along the O a axis. We extract the iron magnetic form factor and use the tabulated j0 of Fe, Fe2+, and Fe3+ to obtain a magnetic moment size of ~0.8 µB at 9.5 K.
©2010 The American Physical Society
| History: | Received 21 June 2010; revised 12 July 2010; published 9 August 2010 |
| Permalink: |
http://link.aps.org/abstract/PRB/v82/e064409 |
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