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Experimental determination of the microscopic origin of magnetism in parent iron pnictides
D. Hsieh, Y. Xia, L. Wray +7
Like high Tc cuprates, the newly discovered iron based superconductors lie in close proximity to a magnetically ordered parent phase. However, while the magnetic order in parent cu…
Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
L. Wray, D. Qian, D. Hsieh +13
We present a systematic angle-resolved photoemission spectroscopic study of the high-Tc superconductor class (Sr/Ba){1-x}(K/Na)xFe2As2. By utilizing a photon-energy-modulation cont…
Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
K. Nakayama, T. Sato, P. Richard +8
We have performed high-resolution angle-resolved photoemission spectroscopy on the optimally-doped BaKFeAs compound and determined the accurate momentum dep…
Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance
S. Kawasaki, K. Shimada, G. F. Chen +3
We report As nuclear quadrupole resonance (NQR) studies on superconducting oxypnictide LaFeAsOF ( = 23 K). The temperature dependence of the spi…
Doping evoluton of antiferromagnetic order and structural distortion in LaFeAsOF
Q. Huang, Jun Zhao, J. W. Lynn +4
We use neutron scattering to study the structural distortion and antiferromagnetic (AFM) order in LaFeAsOF as the system is doped with fluorine (F) to induce supercon…
Magnetic Order of the Iron Spins in NdOFeAs
Ying Chen, J. W. Lynn, J. Li +7
Polarized and unpolarized neutron diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdOFeAs. Antiferromagnetic order is observed belo…