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Splitting of resonance excitations in nearly optimally doped Ba(Fe0.94Co0.06)2As2: an inelastic neutron scattering study with polarization analysis
Paul Steffens, C. H. Lee, N. Qureshi +4
Magnetic excitations in Ba(Fe0.94Co0.06)2As2 are studied by polarized inelastic neutron scattering (INS) above and below the superconducting transition. In the superconducting stat…
High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study
H. Mukuda, S. Furukawa, H. Kinouchi +5
We report 75As-NMR study on the Fe-pnictide high-Tc superconductor Y0.95La0.05FeAsO_{1-y} (Y0.95La0.051111) with Tc=50 K that includes no magnetic rare-earth elements. The measurem…
Effect of Co doping on the in-plane anisotropy in the optical spectrum of underdoped Ba(Fe1-xCox)2As2
M. Nakajima, S. Ishida, Y. Tomioka +7
We investigated the anisotropy in the in-plane optical spectra of detwinned Ba(Fe1-xCox)2As2. The optical conductivity spectrum of BaFe2As2 shows appreciable anisotropy in the magn…
Anisotropy of the in-plane resistivity of underdoped Ba(FeCo)As superconductors induced by impurity scattering in the antiferromagnetic orthorhombic phase
S. Ishida, M. Nakajima, T. Liang +8
We investigated the in-plane resistivity anisotropy for underdoped Ba(FeCo)As single crystals with improved quality. We demonstrate that the anisotropy in resis…
From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba,K)Fe2As2
J. -Ph. Reid, A. Juneau-Fecteau, R. T. Gordon +18
The nature of the pairing state in iron-based superconductors is the subject of much debate. Here we argue that in one material, the stoichiometric iron pnictide KFe2As2, there is…
Emergent Phases of Nodeless and Nodal Superconductivity Separated by Antiferromagnetic Order in Iron-based Superconductor (Ca4Al2O6)Fe2(As1-xPx)2: 75As- and 31P-NMR Studies
H. Kinouchi, H. Mukuda, Y. Kitaoka +5
We report P- and As-NMR studies on (CaAlO)Fe(AsP) with an isovalent substitution of P for As. We present the novel evolution of emer…