Magnonlike Dispersion of Spin Resonance in Ni-doped Ba Fe 2 As 2
2013; American Physical Society; Volume: 110; Issue: 17 Linguagem: Inglês
10.1103/physrevlett.110.177002
ISSN1092-0145
AutoresM. G. Kim, G. S. Tucker, D. K. Pratt, Sheng Ran, A. Thaler, A. D. Christianson, Karol Marty, Stuart Calder, A. Podlesnyak, S. L. Bud’ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, R. J. McQueeney,
Tópico(s)Rare-earth and actinide compounds
ResumoInelastic neutron scattering measurements on $\mathrm{Ba}({\mathrm{Fe}}_{0.963}{\mathrm{Ni}}_{0.037}{)}_{2}{\mathrm{As}}_{2}$ 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 ${\mathbf{Q}}_{\mathrm{AFM}}$ along the orthorhombic $\mathbf{a}$ axis, the resonance disperses upwards away from ${\mathbf{Q}}_{\mathrm{AFM}}$ along the $\mathbf{b}$ axis. In contrast to the downward dispersing resonance and hourglass shape of the spin excitations in superconducting cuprates, the resonance in electron-doped $\mathrm{Ba}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ compounds possesses a magnonlike upwards dispersion.
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