Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the ParentBaFe2As2Compound of FeAs-Based High-Temperature Superconductors
| Autor: | Qingzhen Huang, Tao Wu, Mark Green, J. W. Lynn, Y. C. Gasparovic, Wei Bao, Gang Wu, Yiming Qiu, X. H. Chen |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 101 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.101.257003 |
| Popis: | The recent discovery of superconductivity in $(\mathrm{Ba},\mathrm{K}){\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$, which crystallizes in the ${\mathrm{ThCr}}_{2}{\mathrm{Si}}_{2}$ (122) structure as compared with the LnFeAsO (Ln is lanthanide) systems that possess the ZrCuSiAs (1111) structure, demonstrates the exciting potential of the FeAs-based materials for high-${T}_{C}$ superconductivity. Here we report neutron diffraction studies that show a tetragonal-to-orthorhombic distortion associated with the onset of $\mathbf{q}=(101)$ antiferromagnetic order in ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, with a saturation moment $0.87(3){\ensuremath{\mu}}_{B}$ per Fe that is orientated along the longer $a$ axis of the $ab$ planes. The simultaneous first-order structural and magnetic transition is in contrast with the separated transitions previously reported in the 1111-type materials. The orientational relation between magnetic alignment and lattice distortion supports a multiorbital nature for the magnetic order. |
| Databáze: | OpenAIRE |
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