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Effect of carrier doping on the formation and collapse of magnetic polarons in lightly hole-doped La_{1-x}Sr_xCoO_3
A. Podlesnyak, G. Ehlers, M. Frontzek +7
We investigate the doping dependence of the nanoscale electronic and magnetic inhomogeneities in the hole-doping range 0.002<x<0.1 of cobalt based perovskites, La{1-x}Sr_xCoO_3. Us…
Search for pressure induced superconductivity in CeFeAsO and CeFePO iron pnictides
Diego A. Zocco, Ryan E. Baumbach, James J. Hamlin +11
The CeFeAsO and CeFePO iron pnictide compounds were studied via electrical transport measurements under high-pressure. In CeFeAsO polycrystals, the magnetic phases involving the Fe…
Magnetism and Disorder Effects on muSR Measurements of the Magnetic Penetration Depth in Iron-Based Superconductors
J. E. Sonier, W. Huang, C. V. Kaiser +8
It is shown that attempts to accurately deduce the magnetic penetration depth of overdoped BaFe_{1.82}Co_{0.18}As2 single crystals by transverse-field muon spin rotation (TF-muSR)…
Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry
Athena S. Sefat, David J. Singh, V. Ovidiu Garlea +4
We show using a combination of powder X-ray and neutron diffraction, first principles calculations, temperature- and field-dependent magnetization, heat capacity and resistivity da…
Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2
K. Marty, A. D. Christianson, C. H. Wang +7
We present neutron diffraction measurements on single crystal samples of non-superconducting Ba(Fe1-xCrx)2As2 as a function of Cr-doping for 0<=x<=0.47. The average SDW moment is i…
Iron substitution in NdCoAsO: crystal structure and magnetic phase diagram
Michael A. McGuire, Athena S. Sefat, Brian C. Sales +1
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…