PdO纳米粒子的宏观量子隧穿
Macroscopic quantum tunneling in PdO nanoparticles
摘要：
我们研究了PdO纳米粒子在低温下的物理行为，这表现出明显与宏观量子隧穿相关的不寻常行为。样品为四方晶系，空间群为P42/mmc。最重要的是，粒径估计为约5.07 nm。使用适当的技术来确定这些纳米颗粒的特性。这项研究的最重要的方面是在低温下进行的磁性表征。它在零场冷却模式（ZFC）下在50 K处显示出峰值，其对应于阻塞温度（T $_{B}$）。在ZFC和场冷却（FC）中的这些测量表明，峰值行为是由于当电子从亚稳态改变到另一个时，不对称势垒的不同弛豫时间。低于FC模式下的T $_{B}$，磁化强度随温度降低，直到36 K;该温度是与势垒的各向异性相关的交叉温度（T $_{Cr}$），指示宏观量子隧穿。
英文摘要：
We studied the physical behavior of PdO nanoparticles at low temperatures, which presents an unusual behavior clearly related to macroscopic quantum tunneling. The samples show a tetragonal single phase with P42/mmc space group. Most importantly, the particle size was estimated at about 5.07 nm. Appropriate techniques were used to determine the characteristic of these nanoparticles. The most important aspect of this study is the magnetic characterization performed at low temperatures. It shows a peak at 50 K in zero field cooling mode (ZFC) that corresponds to the Blocking temperature (T$_{B}$). These measurements in ZFC and field cooling (FC) indicates that the peak behavior is due to different relaxation times of the asymmetrical barriers when the electron changes from a metastable state to another. Below T$_{B}$ in FC mode, the magnetization decreases with temperature until 36 K; this temperature is the crossover temperature (T$_{Cr}$) related to the anisotropy of the barriers, indicative of macroscopic quantum tunneling.
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