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Antiferromagnetic Spin Fluctuation above the Superconducting Dome and the Full-Gaps Superconducting State in LaFeAsO1-xFx Revealed by 75As-Nuclear Quadrupole Resonance
T. Oka, Z. Li, S. Kawasaki +3
We report a systematic study by 75As nuclear-quadrupole resonance in LaFeAsO1-xFx. The antiferromagnetic spin fluctuation (AFSF) found above the magnetic ordering temperature TN =…
Collapse of the Fe-vacancy order and successive phase transitions in superconducting KxFe2-ySe2 (0.7 \leg x \leg 0.8, 0.2 \leg y \leg 0.3)
J. Q. Li, Y. J. Song, H. X. Yang +6
The Fe-based superconducting KxFe2-ySe2 (0.6 {\leg} x {\leg} 1, 0.2{\leg} y {\leg} 0.4) compounds, unlike the well-known RFe2As2 (R = Ba, Sr, Ca) superconductors, contain complex s…
Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
L. Ma, G. F. Ji, J. Zhang +5
We report both 77Se and 87Rb NMR studies on Tl0.47Rb0.34Fe1.63Se2 single-crystalline superconductors (T_c about 32 K). Singlet superconductivity is decisively determined by a sharp…
77Se NMR Evidence of Strongly Coupled Superconductivity in K0.8Fe2-xSe2
L. Ma, J. B. He, D. M. Wang +2
We report the 77Se NMR Knight shift and spin-lattice relaxation studies on the superconducting state of the ternary iron selenide K0.8Fe2-xSe2 with Tc~30 K. Just below Tc, the Knig…
The magnetoresistance and Hall effect in CeFeAsO: a high magnetic field study
H. Q. Yuan, L. Jiao, J. Singleton +4
The longitudinal electrical resistivity and the transverse Hall resistivity of CeFeAsO are simultaneously measured up to a magnetic field of 45T using the facilities of pulsed magn…
Upper critical field of the 122-type iron pnictide superconductors
L. Jiao, J. L. Zhang, F. F. Balakirev +4
The upper critical fields () of the single crystals and were determined by means of measuring the electrical resistivit…