Iron substitution in NdCoAsO: Crystal structure and magnetic phase diagram

Michael A. McGuire, Athena S. Sefat, Brian C. Sales, David Mandrus

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4 Scopus citations

Abstract

The effects of replacing small amounts of Co with Fe in NdCoAsO are reported. Polycrystalline materials with compositions NdCo1-x Fe xAsO (x=0.05, 0.10, 0.15, and 0.20) are studied and the results compared to previous reports for NdCoAsO. Rietveld analysis of powder x-ray diffraction data shows that as Fe replaces Co on the transition metal (T) site, the T -As distance increases, and the As tetrahedra surrounding the T site become more regular. Electrical resistivity and magnetization measurements indicate that the three magnetic phase transitions in NdCoAsO are suppressed as Co is replaced by Fe, and these transitions are not observed above 1.8 K for x=0.20. Based on these results, the magnetic phase diagram for the Co-rich side of the NdCoAsO-NdFeAsO system is constructed.

Original languageEnglish
Article number092404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number9
DOIs
StatePublished - Sep 28 2010

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