Polarized-neutron study of longitudinal Haldane-gap excitations in Nd2BaNiO5
S. Raymond, T. Yokoo, A. Zheludev, S. E. Nagler, A. Wildes, J. Akimitsu
Abstract
Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap.
Create a lesson
Related papers
Metallic electron crystals in rhombohedral graphene as a bridge to twisted WSe2
Wentai Deng, Chenyuan Li, Naoto Nakatsuji et al.
Anyons at impurities: Fractional charge measurement and "wrong sign" binding
Haydn S. Adlong, Arthur Christianen, Atac Imamoglu et al.
Large-Tiny Spin-Stripe SDW Order in La3Ni2O7 via 139La-NQR Spectroscopy: Reconsideration Based on the Am2m Structure
Mitsuharu Yashima, Hongnam Lee, Takumi Ino et al.
Influence of the Néel vector on the bulk electronic structure of MnTe measured from the (1 1 00) surface
D. A. Usanov, A. B. Hellenes, S. Hahn et al.
Disorder-Induced Griffiths like Phase and Charge Localization in Sr2FeRuO6
Koustav Pal, Shuvendu Ghosh, I. Das
Interplay of electric field and electronic correlations in pairing competition in bilayer nickelates
Yanmei Cai, Yicheng Xiong, Ying Liang et al.