Unconventional superconductivity in Ba0.6K0.4Fe2As2 from inelastic neutron scattering

被引:519
作者
Christianson, A. D. [2 ]
Goremychkin, E. A. [1 ,3 ]
Osborn, R. [1 ]
Rosenkranz, S. [1 ]
Lumsden, M. D. [2 ]
Malliakas, C. D. [1 ,4 ]
Todorov, I. S. [1 ]
Claus, H. [1 ]
Chung, D. Y. [1 ]
Kanatzidis, M. G. [1 ,4 ]
Bewley, R. I. [3 ]
Guidi, T. [3 ]
机构
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA
[3] Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England
[4] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
关键词
D O I
10.1038/nature07625
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A new family of superconductors containing layers of iron arsenide(1-3) has attracted considerable interest because of their high transition temperatures (T-c), some of which are > 50 K, and because of similarities with the high-T-c copper oxide superconductors. In both the iron arsenides and the copper oxides, superconductivity arises when an antiferromagnetically ordered phase has been suppressed by chemical doping(4). A universal feature of the copper oxide superconductors is the existence of a resonant magnetic excitation, localized in both energy and wavevector, within the superconducting phase(5-9). This resonance, which has also been observed in several heavy- fermion superconductors(10-12), is predicted to occur when the sign of the superconducting energy gap takes opposite values on different parts of the Fermi surface(13), an unusual gap symmetry which implies that the electron pairing interaction is repulsive at short range(14). Angle- resolved photoelectron spectroscopy shows no evidence of gap anisotropy in the iron arsenides, but such measurements are insensitive to the phase of the gap on separate parts of the Fermi surface(15). Here we report inelastic neutron scattering observations of a magnetic resonance below T-c in Ba0.6K0.4Fe2As2, a phase- sensitive measurement demonstrating that the superconducting energy gap has unconventional symmetry in the iron arsenide superconductors.
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页码:930 / 932
页数:3
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