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19 papers · 2 filters
Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2
F. L. Ning, K. Ahilan, T. Imai +5
We report a systematic investigation of Ba[Fe(1-x)Co(x)]2As2 based on transport and 75-As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping p…
The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
W. Yu, A. A. Aczel, T. J. Williams +4
Recent high-pressure studies found that superconductivity can be achieved under very low pressure in the parent iron arsenide compound CaFe2As2, although details of the sharpness a…
NMR measurements of intrinsic spin susceptibility in LaFeAsO(0.9)F(0.1)
T. Imai, K. Ahilan, F. L. Ning +5
We will probe the intrinsic behavior of spin susceptibility chi_(spin) in the LaFeAsO(1-x)F(x) superconductor (x ~ 0.1, Tc ~ 27K) using 19-F and 75-As NMR techniques. Our new resul…
Pressure effects on the electron-doped high Tc superconductor BaFe(2-x)Co(x)As(2)
K. Ahilan, J. Balasubramaniam, F. L. Ning +6
Application of pressures or electron-doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe(2)As(2) into a superconductor with the Tc exceeding…
59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K)
F. L. Ning, K. Ahilan, T. Imai +5
We report an NMR investigation of the superconductivity in BaFe(2)As(2) induced by Co doping (Tc=22K). We demonstrate that Co atoms form an alloy with Fe atoms and donate carriers…
Superconductivity coexisting with phase-separated static magnetic order in (Ba,K)FeAs, (Sr,Na)FeAs and CaFeAs
T. Goko, A. A. Aczel, E. Baggio-Saitovitch +22
The recent discovery and subsequent developments of FeAs-based superconductors have presented novel challenges and opportunities in the quest for superconducting mechanisms in corr…