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arXiv 2009.12259cond-mat.mtrl-scicond-mat.other
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钆作为单分子磁体中的单原子催化剂

Gadolinium as a single atom catalyst in a single molecule magnet

Aram Kostanyan, Christin Schlesier, Rasmus Westerstrom, Jan Dreiser, Fabian Fritz, Bernd Buchner, Alexey A. Popov, 3Cinthia Piamonteze, Thomas Greber

摘要:

内嵌富勒烯是磁性研究的理想纳米实验室。用钆取代Dy2ScN@C80中的抗磁性钪原子降低了给定磁化强度的稳定性,并证明Gd充当加速达到热平衡的单原子催化剂。在Gd和Dy的M4,5边缘处的X射线磁性圆二色性表明Gd的磁矩遵循两个Dy离子的外部和偶极磁场的总和,并且与Dy2ScN@C80相比,在铁磁和反铁磁Dy配置之间发现较低的交换势垒。从超导量子干涉装置磁力测量法获得的Arrhenius平衡势垒大于一个数量级,尽管小得多的前因子在Dy2GdN@C80中施加更快的平衡。这揭示了角动量平衡在磁弛豫中的重要性。

英文摘要:

Endohedral fullerenes are perfect nanolaboratories for the study of magnetism. The substitution of a diamagnetic scandium atom in Dy2ScN@C80 with gadolinium decreases the stability of a given magnetization and demonstrates Gd to act as a single atom catalyst that accelerates the reaching of thermal equilibrium. X-ray magnetic circular dichroism at the M4,5 edges of Gd and Dy shows that the Gd magnetic moment follows the sum of the external and the dipolar magnetic field of the two Dy ions and compared to Dy2ScN@C80 a lower exchange barrier is found between the ferromagnetic and the antiferromagnetic Dy configuration. The Arrhenius equilibration barrier as obtained from superconducting quantum interference device magnetometry is more than one order of magnitude larger, though a much smaller prefactor imposes faster equilibration in Dy2GdN@C80. This sheds light on the importance of the angular momentum balance in magnetic relaxation.

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