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Unusual Relationship between Magnetism and Superconductivity in FeTeSe
H. A. Mook, M. D. Lumsden, A. D. Christianson +8
We use neutron scattering, to study magnetic excitations in crystals near the ideal superconducting composition of FeTeSe. Two types of excitations are found, a res…
Magnetic Phase Transitions in NdCoAsO
Michael A. McGuire, Delphine J. Gout, V. Ovidiu Garlea +3
Magnetization measurements reveal that NdCoAsO undergoes three magnetic phase transitions below room temperature. The crystal and magnetic structures of NdCoAsO have been determine…
Point-contact spectroscopic studies on normal and superconducting AFe_2As_2-type iron-pnictide single crystals
Xin Lu, W. K. Park, H. Q. Yuan +11
Point-contact Andreev reflection spectroscopy (PCARS) is applied to investigate the gap structure in iron pnictide single crystal superconductors of the AFe_2As_2 (A=Ba, Sr) family…
New Fe-based superconductors: properties relevant for applications
M Putti, I Pallecchi, E Bellingeri +23
Less than two years after the discovery of high temperature superconductivity in oxypnictide LaFeAs(O,F) several families of superconductors based on Fe layers (1111, 122, 11, 111)…
Aligned crystallite powder of NdFeAsOF: magnetic hysteresis and penetration depth
Yuri L. Zuev, Eliot D. Specht, Claudia Cantoni +7
We report the basal-plane critical current and superfluid density of magnetically aligned NdFeAsOF powder. This sample has individual crystallite grains permanent…
Surface Geometric and Electronic Structure of BaFe2As2(001)
V. B. Nascimento, Ang Li, Dilushan R. Jayasundara +15
BaFe2As2 exhibits properties characteristic of the parent compounds of the newly discovered iron (Fe)-based high-TC superconductors. By combining the real space imaging of scanning…
Neutron scattering patterns show Superconductivity in FeTe0.5Se0.5 likely results from itinerant electron fluctuations
H. A. Mook, M. D. Lumsden, A. D. Christianson +8
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. F…
75As NMR Observation of Anisotropic Spin Fluctuations in the Ba[(Fe0.92Co0.08)2]2As2 Superconductor (Tc = 22 K)
Fanlong Ning, Kanagasingham Ahilan, Takashi Imai +5
We demonstrate that the anisotropy R of the paramagnetic spin fluctuations grows toward Tc at 75As sites in the optimally electron-doped superconductor Ba[(Fe0.92Co0.08)2]2As2, wit…
Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO
Michael A. McGuire, David J. Singh, Athena S. Sefat +2
We have studied the effects of the isoelectronic substitution of Ru for Fe in polycrystalline samples of the spin density wave (SDW) material PrFeAsO. Crystal structures from powde…
Hole-doped BaFe2-xCrxAs2 Crystals: A Case of Non-superconductivity
Athena S. Sefat, David J. Singh, Lindsay H. VanBebber +6
We investigate the physical properties and electronic structure upon Cr-doping in the iron arsenide layers of BaFe2As2. This form of hole-doping leads to suppression of the magneti…
BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping
Athena S. Sefat, David J. Singh, Rongying Jin +4
The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K…
Spin Excitations in BaFe1.84Co0.16As2 Superconductor Observed by Inelastic Neutron Scattering
D. Parshall, K. A. Lokshin, Jennifer Niedziela +11
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…
Evidence for Three-Dimensionality in the Fermi Surface Topology of Layered Electron Doped Ba(Fe1-XCox)2As2 Iron Superconductors
P. Vilmercati, A. Fedorov, I. Vobornik +10
The electronic structure of electron doped iron-arsenide superconductors Ba(Fe1- xCox)2As2 has been measured with Angle Resolved Photoemission Spectroscopy. The data reveal a marke…
Structure and Anisotropic Properties of BaFe2-xNixAs2 (x = 0, 1, 2) Single Crystals
Athena S. Sefat, Rongying Jin, Michael A. McGuire +5
The crystal structure, anisotropic electrical resistivity and magnetic susceptibility, as well as specific heat results from single crystals of BaFe2As2, BaNi2As2, and BaFeNiAs2 ar…