Published 2019
| Version v1
Publication
The local structure and magnetic correlations in La(Fe1-Mn )AsO system
Description
The local structure of La(Fe1-xMnx)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 (hAs) from the Fe-Fe plane, is correlated
with the Néel temperature. Furthermore, Fe Kβ 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.
Additional details
Identifiers
- URL
- http://hdl.handle.net/11567/953653
- URN
- urn:oai:iris.unige.it:11567/953653
Origin repository
- Origin repository
- UNIGE