Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 21: Correlated Electrons: Poster Session
TT 21.9: Poster
Wednesday, September 7, 2022, 15:00–18:00, P1
Classical Ising-like dipolar antiferromagnet DyScO3 with slow spin dynamics — •Nikita Andriushin1, Stanislav Nikitin2,3, and Andrey Podlesnyak4 — 1TU Dresden, Germany — 2MPI CPfS, Dresden, Germany — 3PSI, Villigen, Switzerland — 4ORNL, Tennessee, USA
The usual timescale of the spin flip process in common magnetic systems is femto- to picoseconds. In this work we show with the help of both AC and DC magnetization measurements and classical Monte-Carlo calculations that the spin dynamics in DyScO3 can be slowed down to milliseconds and further. The orthorhombic DyScO3 has a large uniaxial anisotropy caused by the strong crystalline electric field (CFT), which freezes magnetic moments below a certain temperature. Large anisotropy and long-range dipolar interaction result in an Ising-like antiferromagnetic ordering with critical temperature TC = 3.14 K. Magnetization and susceptibility measurements revealed a magnetization relaxation on a timescale of minutes, which is unexpected for an antiferromagnet. As a classical approach for modeling Ising-like spin systems, the Monte-Carlo calculations with Metropolis algorithm were used. Our calculations, taking into account the dipole-dipole interaction energy, comprehensively reproduce the observed magnetic behavior, correctly predict the ground state, critical temperature and capture slow magnetization dynamics.