SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 52: Frustrated Magnets: Strong Spin-Orbit Coupling
TT 52.6: Vortrag
Donnerstag, 30. März 2023, 16:30–16:45, HSZ 201
Milli-Kelvin thermal conductivity of YbAlO3, a quasi-one-dimensional quantum magnet — •Parisa Mokhtari1,2,3, Ulrike Stockert1, Stanislav Nikitin4, Leonid Vasylechko5, Manuel Brando2, and Elena Hassinger1 — 1Institute of Solid State and Materials, Dresden, Germany — 2Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany — 3Physics Department, Technical University of Munich, Garching, Germany — 4Paul Scherrer Institute, Villigen, Switzerland — 5Lviv Polytechnic National University, Lviv, Ukraine
In 2019, Wu et al. found the typical excitation spectrum of the fractionalised magnetic excitations, so-called spinons, in the Q-1D material YbAlO3 via neutron scattering at 1 K. YbAlO3 exhibits AFM (Jc=2.3 K) and FM (Jab=0.8 K) exchange interaction along and perpendicular to the chain direction, respectively [1, 2]. In zero field (B), a 3D AFM order is established at 0.88 K. For B ∥ a, this order is suppressed and replaced by an incommensurate-AFM state, until the field-polarised state occurs for B >1.5 T.
In this work, we investigate the thermal conductivity (κ) of YbAlO3 down to 30 mK in B up to 4 T, with a focus on the magnetic excitations’ contribution in thermal transport within different phases and their interactions with lattice vibrations.
Notably, our results are in agreement with the previous reports, as well as providing new anomalies compared to thermodynamics’ probes and theoretical predictions.
[1] L. S. Wu et al., Nat. Commun. 10, 698 (2019).
[2] L. S. Wu et al., Phys. Rev. B 99, 195117 (2019).