Iron substitution in NdCoAsO: crystal structure and magnetic phase diagram

Abstract

The effects of replacing small amounts of Co with Fe in NdCoAsO are reported. Polycrystalline materials with compositions NdCo1-xFexAsO (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.

Accepted for publication in Physical Review B, revised text and figures, 5 pages, 5 figures

References in corpus (10)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Superconductivity in Co-doped LaFeAsO
• Effect of Co doping on superconductivity and transport properties in SmFe${}_{1-x}$Co${}_x$AsO
• Superconductivity induced by cobalt doping in iron-based oxyarsenides
• Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System
• Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
• Superconductivity in NdFe1-xCoxAsO (0.05 < x < 0.20) and rare-earth magnetic ordering in NdCoAsO
• Magnetic Phase Transitions in NdCoAsO
• Magnetic phase transitions in SmCoAsO
• Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs

Cited by in corpus (1)

• Magnetic phase diagram in the Co-rich side of LnCo1-xFexAsO (Ln=La, Sm) system