Polarized neutron scattering studies of magnetic excitations in iron-selenide superconductor Li0.8Fe0.2ODFeSe (T c = 41 K)

Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor

Neutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor

We report inelastic neutron scattering experiments on single crystals of superconducting Ba(0.67)K(0.33)Fe(2)As(2) (T(c) = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spin excitations in the normal state form longitudinally elongated ellipses along the Q(AFM) direction in momentum space, consistent with density functional theory predictions. O...

Magnetic excitations in the high-T-c iron pnictides

We calculate the expected finite frequency neutron-scattering intensity based on the two-sublattice collinear antiferromagnet found by recent neutron-scattering experiments as well as by theoretical analysis on the iron oxypnictide LaOFeAs. We consider two types of superexchange couplings between Fe atoms: nearest-neighbor coupling J1 and next-nearest-neighbor coupling J2. We show how to distin...

Neutron investigation of the magnetic scattering in an iron-based ferromagnetic superconductor

Jeffrey W. Lynn,1,* Xiuquan Zhou,2 Christopher K. H. Borg,2 Shanta R. Saha,3 Johnpierre Paglione,3,4 and Efrain E. Rodriguez2 1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA 2Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA 3Department of Physics, University of Maryland, ...

Phonon and magnetic neutron scattering at 41 meV in YBa2Cu3O7.

We report inelastic neutron scattering measurements at excitation energies h̄v , 41 meV in YBa 2Cu 3O 7. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the scattered intensity. The previously reported broad peak around q ­ spya, pyad in the normal state can be entirely accounted for by a phonon which primarily in...