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

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 $T^{\ast }=10$ 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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Cited by in corpus (2)

• Quasi One-Dimensional Ising-like Antiferromagnetism in the Rare-earth Perovskite Oxide TbScO${}_3$
• Competition Between Multiferroic and Magnetic Soliton Lattice States in DyFeO${}_3$