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TT: Fachverband Tiefe Temperaturen
TT 9: Correlated Magnetism – Low-Dimensional Systems
TT 9.5: Vortrag
Montag, 17. März 2025, 16:00–16:15, H33
Sub-Kelvin magnetic susceptibility insights into the spin chain system YbAlO3 — •Lipsa Behera1,2, Javier Landaeta2, Konstantin Semeniuk2, and Elena Hassinger1,2 — 1TUD Dresden University of Technology, Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Low dimensional quantum magnets offer a rich platform to explore intriguing physics such as Tomonaga-Luttinger liquid, incommensurate phases and quantum phase transitions. What makes them special is the constraint in dimensionality leading to strong correlations. YbAlO3 is an example of a quasi-one-dimensional spin chain system that can be described as a S = 1/2 Heisenberg chain with smaller Ising-like interchain interactions. At 1K it shows a typical spinon spectrum. At low temperature, the phase diagram presents an antiferromagnetic phase below 0.9 K, that changes into a longitudinal spin density wave including a MS/3 plateau, transverse antiferromagnetic phase and the field polarised state with H ||a. Recent thermal conductivity and magnetostriction measurements uncovered a previously unobserved MS/5 plateau phase at B = 0.7 T, motivating detailed sub-kelvin magnetic susceptibility studies. Here, we report ac susceptibility measurements down to 25 mK, which not only reproduces the known phase diagram to a good extent, but also confirm the presence of the magnetization plateau Ms/5. Furthermore, it reveals additional anomalies, embedded in the incommensurate phase, adding up to the complex magnetic behavior of this material.
Keywords: magnetic; susceptibility; quasi; incommensurate; plateau