Fe_{1+y} Se_（xTe_{1-x}）的磁激发
Magnetic excitations of Fe_{1+y}Se_xTe_{1-x} in magnetic and superconductive phases
摘要：
本文用中子非弹性散射和μ子自旋转动方法比较了超导和非超导Fe_（1.10）Se_（0.25）Te_（0.75）单晶的低能磁激发。Fe1.01Se0.50Te0.50我们确认存在的自旋共振在超导阶段的Fe1.01Se0.50Te0.50，在7 meV的能量和波矢（1/2，1/2，0）。非超导样品在（1/2，1/2，0）\pm（0.18，-0.18，0）处表现出两个能量急剧上升的无公度磁激发，但在低能量下没有观察到共振。在Fe1.10Se0.25Te0.75中也观察到了一个强分散的低能磁激发，接近于相称的反铁磁有序波矢（1/2-δ，0，1/2），其中δ \approx 0.03。在这两个样品中的磁相关性被发现是准二维的字符，并坚持远远高于磁（Fe1.10Se0.25Te0.75）和超导（Fe1.01Se0.50Te0.50）的转变温度。
英文摘要：
We have used inelastic neutron scattering and muon-spin rotation to compare the low energy magnetic excitations in single crystals of superconducting Fe1.01Se0.50Te0.50 and non-superconducting Fe1.10Se0.25Te0.75. We confirm the existence of a spin resonance in the superconducting phase of Fe1.01Se0.50Te0.50, at an energy of 7 meV and a wavevector of (1/2,1/2,0). The non-superconducting sample exhibits two incommensurate magnetic excitations at (1/2,1/2,0)\pm(0.18,-0.18,0) which rise steeply in energy, but no resonance is observed at low energies. A strongly dispersive low-energy magnetic excitation is also observed in Fe1.10Se0.25Te0.75 close to the commensurate antiferromagnetic ordering wavevector (1/2-δ,0,1/2) where δ\approx 0.03. The magnetic correlations in both samples are found to be quasi-two dimensional in character and persist well above the magnetic (Fe1.10Se0.25Te0.75) and superconducting (Fe1.01Se0.50Te0.50) transition temperatures.
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