406 citations · 1.2k across the 13 of their papers we have counts for
11 papers · 1 filter
NMR investigation of spin correlations in BaCo2As2
K. Ahilan, T. Imai, A. S. Sefat +1
We use NMR techniques to investigate the magnetic properties of BaCo2As2 single crystals, the non-superconducting end member of the Co-substituted iron-pnictide high Tc superconduc…
Superconductivity Near a Quantum Critical Point in Ba(Fe,Co)2As2
K. Ahilan, F. L. Ning, T. Imai +7
We will examine the possible link between spin fluctuations and the superconducting mechanism in the iron-based high temperature superconductor Ba(Fe,Co)2As2 based on NMR and high…
Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2
F. L. Ning, K. Ahilan, T. Imai +7
We report the first NMR investigation of spin dynamics in the overdoped non-superconducting regime of Ba(Fe[1-x]Co[x])2As2 up to x =0.26. We demonstrate that the absence of inter-b…
The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
K. Ahilan, F. L. Ning, T. Imai +4
We report comprehensive resistivity measurements of single crystalline samples of the Ba(Fe(1-x)Co(x))2As2 high Tc superconductor under hydrostatic pressure up to 2.75 GPa and over…
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…
Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
T. Imai, K. Ahilan, F. L. Ning +2
Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the…
59Co and 75As NMR Investigation of the Lightly Doped Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04)
F. L. Ning, K. Ahilan, T. Imai +5
We investigate the electronic properties of Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04) in the lightly electron-doped regime by 59Co and 75As NMR. We demonstrate that Co doping significan…
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…
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…
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…
19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
K. Ahilan, F. L. Ning, T. Imai +5
We report 19-F NMR investigation of the new high temperature superconductor LaFeAsO(0.89)F(0.11) (Tc ~ 28K). We demonstrate that low frequency spin fluctuations exhibit pseudo gap…