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The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure
J. R. Jeffries, N. P. Butch, H. Cynn +5
Unlike the ferropnictide superconductors, which crystallize in a tetragonal crystal structure, binary FeAs forms in an orthorhombic crystal structure, where the local atomic enviro…
Interstitial Iron Controlled Superconductivity in Fe1+xTe0.7Se0.3
E. E. Rodriguez, C. Stock, P-Y Hsieh +3
The superconducting series, Fe(Te,Se), has a complex structural and magnetic phase diagram that is dependent on composition and occupancy of a secondary interstitial Fe site. In th…
Non-collinear spin-density wave antiferromagnetism in FeAs
E. E. Rodriguez, C. Stock, K. Krycka +6
We present the magnetic structure of the itinerant monoarsenide, FeAs, with the B31 structure. Powder neutron diffraction confirms incommensurate modulated magnetism with wavevecto…
On the resistivity at low temperatures in electron-doped cuprate superconductors
S. Finkelman, M. Sachs, J. Paglione +4
We measured the magnetoresistance as a function of temperature down to 20mK and magnetic field for a set of underdoped PrCeCuO (x=0.12) thin films with controlled oxygen content. T…
Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
Kevin Kirshenbaum, Shanta R. Saha, Tyler Drye +1
Single crystals of SrFe2-xPtxAs2 (0 < x < 0.36) were grown using the self flux solution method and characterized using x-ray crystallography, electrical transport, magnetic suscept…
Terahertz Kerr and Reflectivity Measurements on the Topological Insulator Bi2Se3
G. S. Jenkins, A. B. Sushkov, D. C. Schmadel +4
We report the first terahertz Kerr measurements on bulk crystals of the topological insulator Bi2Se3. At T=10K and fields up to 8T, the real and imaginary Kerr angle and reflectanc…
Far infrared cyclotron resonance and Faraday effect in Bi2Se3
A. B. Sushkov, G. S. Jenkins, D. C. Schmadel +3
The complex Faraday angle and transmission for the topological insulator Bi2Se3 were measured in the far infrared in magnetic fields up to 8 T and analyzed in terms of a simple Dru…
Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2
Shanta R. Saha, Kevin Kirshenbaum, Nicholas P. Butch +2
The effect of alkaline earth substitution on structural parameters was studied in high-quality single crystals of Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2 grown by the self-flux m…
High-temperature superconductivity in iron-based materials
Johnpierre Paglione, Richard L. Greene
The surprising discovery of superconductivity in layered iron-based materials, with transition temperatures climbing as high as 55 K, has lead to thousands of publications on this…
Superfluid Density and Field-Induced Magnetism in Ba(Fe1-xCox)2As2 and Sr(Fe1-xCox)2As2 Measured with Muon Spin Relaxation
T. J. Williams, A. A. Aczel, E. Baggio-Saitovitch +14
We report muon spin rotation (SR) measurements of single crystal Ba(FeCo)As and Sr(FeCo)As. From measurements of the magnetic field penet…
Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
Xiaohang Zhang, Yoon Seok Oh, Yong Liu +8
We have systematically investigated the doping and the directional dependence of the gap structure in the 122-type iron pnictide superconductors by point contact Andreev reflection…
Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
Nicholas P. Butch, Kevin Kirshenbaum, Paul Syers +4
While evidence of a topologically nontrivial surface state has been identified in surface-sensitive measurements of Bi2Se3, a significant experimental concern is that no signatures…