Evolution of spin excitations into the superconducting state in FeTe1-xSex (2009)
Lumsden, M. D., Christianson, A. D., Goremychkin, E. A., Nagler, S. E., Mook, H. A., Stone, M. B., ...
The nature of the superconducting state in the recently discovered Fe-based superconductors1-3 is the subject of intense scrutiny. Neutron scattering investigations have already elucidated a strong...
Mook, H. A., Lumsden, M. D., Christianson, A. D., Sales, Brian C., Jin, Rongying, McGuire, Michael A., ...
The discovery of the Fe pnictide superconductors generated great interest as the structure consists of planes of a magnetic material quite similar to the cuprate superconductors. Fe(Te0.5Se0.5) is a...
Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$ (2009)
Christianson, A. D., Lumsden, M. D., Nagler, S. E., MacDougall, G. J., McGuire, M. A., Sefat, A. S., ...
We report neutron scattering measurements on single crystals of BaFe$_{1.92}$Co$_{0.08}$As$_2$. The magnetic Bragg peak intensity is reduced by 6 % upon cooling through T$_C$. The spin dynamics...
Spin Excitations in BaFe1.84Co0.16As2 Superconductor Observed by Inelastic Neutron Scattering (2009)
Parshall, D., Lokshin, K. A., Niedziela, Jennifer, Christianson, A. D., Lumsden, M. D., Mook, H. A., ...
Superconductivity appears to compete against the spin-density-wave in Fe pnictides. However, optimally cobalt doped samples show a quasi-two-dimensional spin excitation centered at the (0.5, 0.5, L)...
Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2 (2008)
Lumsden, M. D., Christianson, A. D., Parshall, D., Stone, M. B., Nagler, S. E., MacDougall, G. J., ...
Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling...
Lattice and Magnetic structures of PrFeAsO, PrFeAsO0.85F0.15 and PrFeAsO0.85 (2008)
Zhao, Jun, Huang, Q., De La Cruz, Clarina, Lynn, J. W., Lumsden, M. D., Ren, Z. A., ...
We use powder neutron diffraction to study the spin and lattice structures of polycrystalline samples of nonsuperconducting PrFeAsO and superconducting PrFeAsO0.85F0.15 and PrFeAsO0.85. We find that...
Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2 (2008)
Christianson, A. D., Goremychkin, E. A., Osborn, R., Rosenkranz, S., Lumsden, M. D., Malliakas, C. D., ...
The recent observations of superconductivity at temperatures up to 55K in compounds containing layers of iron arsenide have revealed a new class of high temperature superconductors that show striking...
Phonon Density of States of LaFeAsO1-xFx (2008)
Christianson, A. D., Lumsden, M. D., Delaire, O., Stone, M. B., Abernathy, D. L., McGuire, M. A., ...
We have studied the phonon density of states (PDOS) in LaFeAsO1-xFx with inelastic neutron scattering methods. The PDOS of the parent compound(x=0) is very similar to the PDOS of samples optimally...
Charge order in LuFe2O4: antiferroelectric ground state and coupling to magnetism (2008)
Angst, M., Hermann, R. P., Christianson, A. D., Lumsden, M. D., Lee, C., ...
X-ray scattering by multiferroic LuFe2O4 is reported. Below 320 K, superstructure reflections indicate an incommensurate charge order with propagation close to (1/3,1/3,3/2). The corresponding charge...