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Creators/Authors contains: "Mazzone, Daniel G"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, npj Quantum Materials)
    Abstract The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe2is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetryYandTpoints and disperse along the crystallographic$$\hat{b}$$ b ̂ -axis. In applied magnetic fields to at leastμ0H= 11 T along the$$\hat{c}-{\rm{axis}}$$ c ̂ − axis , the magnetism is found to be field-independent in the (hk0) plane. The scattering intensity is consistent with that expected from U3+/U4+ f-electron spins with preferential orientation along the crystallographic$$\hat{a}$$ a ̂ -axis, and a fluctuating magnetic moment ofμeff=1.7(5)μB. We propose interband spin excitons arising fromf-electron hybridization as a possible origin of the magnetic excitations in UTe2. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Proceedings of the National Academy of Sciences)
    Although ultrafast manipulation of magnetism holds great promise for new physical phenomena and applications, targeting specific states is held back by our limited understanding of how magnetic correlations evolve on ultrafast timescales. Using ultrafast resonant inelastic X-ray scattering we demonstrate that femtosecond laser pulses can excite transient magnons at large wavevectors in gapped antiferromagnets and that they persist for several picoseconds, which is opposite to what is observed in nearly gapless magnets. Our work suggests that materials with isotropic magnetic interactions are preferred to achieve rapid manipulation of magnetism. 
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