Published January 1, 2019
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The local structure and magnetic correlations in La(Fei(1-x)Mn(x))AsO system
Creators
- 1. Univ Roma La Sapienza, Dipartimento Fis, Ple Aldo Moro 2, I-00185 Rome, Italy
- 2. CELLS ALBA Synchrotron Radiat Facil, Carrer Llum 2-26, Barcelona 08290, Spain
- 3. Elettra, Sincrotrone Trieste, Str Statale 14,Km 163-5, Trieste, Italy
- 4. CNR Spin, Corso Petrone 24, I-16152 Genoa, Italy
- 5. Karadeniz Tech Univ, Dept Phys, TR-61080 Trabzon, Turkey
Description
The local structure of La(Fei(1-x)Mn(x))AsO, showing suppression of long-range magnetic order by Mn-substitution, has been studied. Extended X-ray absorption fine structure (EXAFS) measurements at As K-edge and Fe K-edge are used to probe the atomic correlations in the FeAs-layer. We have found that both Fe-As and Fe-Fe bondlengths tend to increase with increasing Mn concentration. The associated mean square relative displacements (MSRD) reveal a gradual increase indicating increased local disorder in the FeAs-layer with Mn content. The results reveal that the FeAs-layer thickness, measured by the As-height (h(AS),) from the Fe-Fe plane, is correlated with the Neel temperature. Furthermore, Fe K beta X-ray emission spectroscopy (XES) shows a sharp increase in the Fe local magnetic moment with Mn substitution. The importance of the FeAs layer thickness in describing magnetic correlations in La(Fe1-xMnx)AsO is discussed.
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