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arXiv · 2204.12398

Slow spin dynamics and quantum tunneling of magnetization in the dipolar antiferromagnet DyScO$_3$

N. D. Andriushin·S. E. Nikitin·G. Ehlers·A. Podlesnyak
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Abstract

We present a comprehensive study of static and dynamic magnetic properties in the Ising-like dipolar antiferromagnet (AFM) DyScO$_3$\ by means of DC and AC magnetization measurements supported by classical Monte-Carlo calculations. Our AC-susceptibility data show that the magnetic dynamics exhibit a clear crossover from an Arrhenius-like regime to quantum tunneling of magnetization (QTM) at $T^* = 10$ K. Below $T_{\mathrm{N}} = 3.2$ K DyScO$_3$ orders in an antiferromagnetic $GxAy$-type magnetic structure and the magnetization dynamics slow down to the minute timescale. The low-temperature magnetization curves exhibit complex hysteretic behavior, which depends strongly on the magnetic field sweep rate. We demonstrate that the low-field anomalies on the magnetization curve are related to the metamagnetic transition, while the hysteresis at higher fields is induced by a strong magnetocaloric effect. Our theoretical calculations, which take into account dipolar interaction between Dy$^{3+}$ moments, reproduce essential features of the magnetic behavior of DyScO$_3$. We demonstrate that DyScO$_3$ represents a rare example of inorganic compound, which exhibits QTM at a single-ion level and magnetic order due to classical dipolar interaction.

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N. D. Andriushin, S. E. Nikitin, G. Ehlers, A. Podlesnyak. 2022-04-26. Slow spin dynamics and quantum tunneling of magnetization in the dipolar antiferromagnet DyScO$_3$. https://doi.org/10.1103/physrevb.106.104427

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