Field-dependent spin dynamics in spin-1/2 Heisenberg antiferromagnetic chain
We wish to study the evolution of the spinon continuum of the Heisenberg antiferromagnetic spin 1/2 chain CuSO4.5D2O as a function of the magnetic field below and up to saturation. Theory predicts the presence of new string-type quasi-particles in addition to "modified" spinon continua. We plan to compare our results quantitatively to theory. The Zeeman-transition of a second, isolated Cu-site, is present in all spectra at finite field and requires good resolution to isolate the chain spectra. A supplementary measurement at 10T will lift all excitations above the range of interest and allow a "perfect" background subtraction. IN5 equipped with the 10T magnet and dilution insert is ideally suited for this purpose, the experiment can not be performed on IN6 (form and width of the resolution) nor on a triple axis (resolution not sufficient). We will need two positions with the 10T magnet per field (quarter-, half-, 3/4-, full saturation, and 10T), and therefore ask for 7d of IN5 equipped with 10T and dilution fridge.
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SAFIULINA Irina; ENDERLE Mechthild; Sonja Holm-Dahlin; OLLIVIER Jacques and Henrik M. Ronnow. (2020). Field-dependent spin dynamics in spin-1/2 Heisenberg antiferromagnetic chain. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-708
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