论文标题
偶极抗抗铁磁化磁化强度的慢速动力学和量子隧道dysco $ _3 $
Slow spin dynamics and quantum tunneling of magnetization in the dipolar antiferromagnet DyScO$_3$
论文作者
论文摘要
我们通过DC和经典蒙特卡洛计算支持的AC磁化测量值介绍了类似Ising的偶极抗抗铁磁铁（AFM）Dysco $ _3 $ \ $ _3 $ \ $ _3 $ \的静态和动态磁性的全面研究。我们的AC敏感性数据表明，磁化动力学表现出明确的交叉，从类似Arrhenius的磁化磁力化（QTM）$ t^* = 10 $K。在$ t^* = 10 $ K中。时间尺度。低温磁化曲线表现出复杂的滞后行为，这在很大程度上取决于磁场扫描速率。我们证明，磁化曲线上的低场异常与元磁过渡有关，而较高场的滞后是由强磁性效应引起的。我们的理论计算考虑了dy $^{3+} $矩之间的偶极相互作用，重现了Dysco $ _3 $的磁性行为的基本特征。我们证明，Dysco $ _3 $代表了无机化合物的罕见例子，该化合物在单离子水平和由于经典的偶极相互作用而以磁性和磁顺序显示。
We present a comprehensive study of static and dynamic magnetic properties in the Ising-like dipolar antiferromagnet (AFM) DyScO$_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.
