TY - JOUR
T1 - Iron substitution in NdCoAsO
T2 - Crystal structure and magnetic phase diagram
AU - McGuire, Michael A.
AU - Sefat, Athena S.
AU - Sales, Brian C.
AU - Mandrus, David
PY - 2010/9/28
Y1 - 2010/9/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77957571321&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.82.092404
DO - 10.1103/PhysRevB.82.092404
M3 - Article
AN - SCOPUS:77957571321
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 9
M1 - 092404
ER -