Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 63: Quantum Magnets and Molecular Magnets (joint session TT/MA)

TT 63.10: Vortrag

Donnerstag, 19. März 2020, 17:45–18:00, HSZ 304

Field-induced magnetic phase in quasi-one-dimensional YbAlO3 — •Stanislav Nikitin1, 2, Liusuo Wu3, Aleksandr Sukhanov1, 2, Nikolay Pavlovskiy4, Jianhui Xu5, Manuel Brando1, Leonid Vasylechko6, and Andrey Podlesnyak71Max Planck Institute CPfS, Dresden, Germany — 2Technical University Dresden, Germany — 3Southern University of Science and Technology, Shenzhen, China — 4Kirensky Institute of Physics, Krasnoyarsk, Russia — 5Helmholtz-Zentrum Berlin, Berlin, Germany — 6Lviv Polytechnic National University, Lviv, Ukraine — 7Oak Ridge National Laboratory, TN , USA

The antiferromagnetic Heisenberg S = 1/2 chain in magnetic field is one of the simplest model, which exhibits quantum critical behavior. In finite magnetic field below the QPT, a weak interchain interaction can stabilize an incommensurate spin-density wave phase, which propagation vector can be continuously tuned by magnetic field.

YbAlO3 is a quasi-1D spin chain compound, where Yb moments form spin chain along the c-axis. In this work we studied excitation spectrum and magnetic structure of this materials by means of neutron scattering in magnetic field. We found that the excitation spectra are well described by simple Heisenberg model in magnetic field. However, in contrast to the simple spin-density wave ordering with propagation vector q = 2kF as predicted by the Heisenberg model, the magnetic structure shows more complex behavior and drastically changes at M/3 plateau. We discuss a possible theory explanation for this behavior.

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