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Magnetic excitations of Fe<sub>1 +<i>y</i></sub>Se<sub><i>x</i></sub>Te<sub>1 โ<i>x</i></sub>in magnetic and superconductive phases
We have used inelastic neutron scattering and muon-spin rotation to compare the low energy magnetic excitations in single crystals of superconducting Fe(1.01)Se(0.50)Te(0.50) and non-superconducting Fe(1.10)Se(0.25)Te(0.75). We confirm the existence of a spin resonance in the superconducting phase of Fe(1.01)Se(0.50)Te(0.50), at an energy of 7 meV and a wavevector of (1/2, โฆ