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MA: Fachverband Magnetismus

MA 52: Quantum Magnets and Molecular Magnets (joint session TT/MA)

MA 52.10: Vortrag

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

Field-induced magnetic phase in quasi-one-dimensional YbAlO₃ — •Stanislav Nikitin^{1, 2}, Liusuo Wu³, Aleksandr Sukhanov^{1, 2}, Nikolay Pavlovskiy⁴, Jianhui Xu⁵, Manuel Brando¹, Leonid Vasylechko⁶, and Andrey Podlesnyak⁷ — ¹Max 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 = 2k_F 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.