Abstract
Inelastic neutron scattering measurements on Ba(Fe0.963Ni 0.037)2As2 manifest a neutron spin resonance in the superconducting state with anisotropic dispersion within the Fe layer. Whereas the resonance is sharply peaked at the antiferromagnetic (AFM) wave vector QAFM along the orthorhombic a axis, the resonance disperses upwards away from QAFM along the b axis. In contrast to the downward dispersing resonance and hourglass shape of the spin excitations in superconducting cuprates, the resonance in electron-doped BaFe 2As2 compounds possesses a magnonlike upwards dispersion.
Original language | English |
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Article number | 177002 |
Journal | Physical Review Letters |
Volume | 110 |
Issue number | 17 |
DOIs | |
State | Published - Apr 24 2013 |