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Effect of Molybdenum 4d Hole Substitution in BaFe2As2
Athena S. Sefat, Karol Marty, Andrew D. Christianson +5
We investigate the thermodynamic and transport properties of molybdenum-doped BaFe2As2 (122) crystals, the first report of hole doping using a 4d element. The chemical substitution…
Spatial Inhomogeneity in RFeAsO1-xFx (R =Pr, Nd) Determined from Rare Earth Crystal Field Excitations
E. A. Goremychkin, R. Osborn, C. H. Wang +8
We report inelastic neutron scattering measurements of crystal field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO0.85F0.15. Doping with fluorine produces additional crysta…
Thermoelectric properties of Co, Ir, and Os-Doped FeSi Alloys: Evidence for Strong Electron-Phonon Coupling
Brian C. Sales, Olivier Delaire, Michael A. McGuire +1
The effects of various transition metal dopants on the electrical and thermal transport properties of Fe1-xMxSi alloys (M= Co, Ir, Os) are reported. The maximum thermoelectric figu…
Unusual Phase Transitions and Magnetoelastic Coupling in TlFe1.6Se2 Single Crystals
Brian C. Sales, Michael A. McGuire, Andrew F. May +3
Structural, magnetic, electrical transport, and heat capacity data are reported for single crystals of TlFe1.6Se2. This compound crystallizes in a tetragonal structure similar to t…
Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures
Walter Uhoya, Georgiy M. Tsoi, Yogesh K. Vohra +5
We have investigated structural and magnetic phase transitions under high pressures in a quaternary rare earth transition metal arsenide oxide NdCoAsO compound that is isostructura…
Giant Anharmonic Phonon Scattering in PbTe
O. Delaire, J. Ma, K. Marty +8
Understanding the microscopic processes affecting the bulk thermal conductivity is crucial to develop more efficient thermoelectric materials. PbTe is currently one of the leading…
Kinetically Inhibited Order in a Diamond-Lattice Antiferromagnet
G. J. MacDougall, D. Gout, J. L. Zarestky +5
Frustrated magnetic systems exhibit highly degenerate ground states and strong fluctuations, often leading to new physics. An intriguing example of current interest is the antiferr…
Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures
Walter Uhoya, Georgiy M. Tsoi Yogesh K. Vohra, Michael A. McGuire +4
The crystal structure and electrical resistance of the structurally-layered EuFe2As2 have been studied up to 70 GPa and down to temperature of 10 K, using a synchrotron x-ray sourc…