The amplitude and phase of 5.0-fs optical pulses were characterized by a spectral phase interferometry for direct electric-field reconstruction (SPIDER) technique. This is the shortest pulse ever measured by the SPIDE...
详细信息
The amplitude and phase of 5.0-fs optical pulses were characterized by a spectral phase interferometry for direct electric-field reconstruction (SPIDER) technique. This is the shortest pulse ever measured by the SPIDER technique to our knowledge.
Single crystals of hexagonal RMnO3 (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found ...
Single crystals of hexagonal RMnO3 (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found that the ratio of a Weiss temperature to TN is ∼10 in RMnO3, indicating the dominant role of strong geometrical frustration. The effect of geometrical frustration also appears in specific heat, which shows a presence of a substantial amount of residual magnetic contribution below TN, indicating that a part of the spins are still fluctuating at T≪TN. It is also found that the dielectric anomaly at TN is strongly anisotropic, suggesting a unique correlation between magnetism and dielectric properties in these compounds.
Using a two-dimensional spatial light amplitude and phase-modulator, simultaneous multicolor pulse shaping of coherent ultrabroadband (600 to 850 nm) optical pulses generated by self-phase modulation in an Ar-gas fill...
详细信息
ISBN:
(纸本)1557526451
Using a two-dimensional spatial light amplitude and phase-modulator, simultaneous multicolor pulse shaping of coherent ultrabroadband (600 to 850 nm) optical pulses generated by self-phase modulation in an Ar-gas filled fiber, being applicable for multicolor coherent wave-packet control, was demonstrated.
Dipole resonant x-ray scattering from ordered Mn 3d orbitals in LaMnO3 has been observed near the Mn K-absorption edge. The polarization of the scattered photons is rotated from σ to π′ and the azimuthal angle depe...
详细信息
Dipole resonant x-ray scattering from ordered Mn 3d orbitals in LaMnO3 has been observed near the Mn K-absorption edge. The polarization of the scattered photons is rotated from σ to π′ and the azimuthal angle dependence shows a characteristic twofold symmetry. A theory for the resonant scattering mechanism has been developed by considering the splitting of the Mn 4p levels due to the Mn 3d orbital ordering. The order parameter of the orbital ordering decreases above the Néel temperature ( TN=140K) and disappears at TO=780K, concomitant with a structural phase transition.
暂无评论