Anisotropy of 4f states in 3d-4f single-molecule magnets

被引：0
|
作者：
Rauguth, A. [1 ]
Alhassanat, A. [2 ]
Elnaggar, H. [3 ,4 ]
Athanasopoulou, A. A. [1 ]
Luo, C. [5 ,6 ]
Ryll, H. [5 ]
Radu, F. [5 ]
Mashoff, T. [2 ]
de Groot, Frank M. F.
Rentschler, E. [1 ]
Elmers, H. J. [2 ]
机构：
[1] Johannes Gutenberg Univ Mainz, Dept Chem, D-55128 Mainz, Germany
[2] Johannes Gutenberg Univ Mainz, Inst Phys, D-55128 Mainz, Germany
[3] Univ Utrecht, Inorgan Chem & Catalysis, Debye Inst Nanomat Sci, Univ Laan 99, NL-3584 CG Utrecht, Netherlands
[4] Sorbonne Univ, CNRS, Inst Mineral Phys & Cosmochimi, UMR 7590, 4 Pl Jussieu, F-75005 Paris, France
[5] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany
[6] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
来源：
PHYSICAL REVIEW B | 2022年 / 105卷 / 13期
关键词：
RAY CIRCULAR-DICHROISM; SPIN SUM-RULE; MAGNETIZATION; COMPLEXES; OXIDATION; SPECTRA; FAMILY; ANALOG;
D O I：
10.1103/PhysRevB.105.134-415
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured angular-dependent fluorescence-yield x-ray magnetic circular dichroism spectra on single crystals of the heterometallic 3d - 4f 12-metallacrown-4 TbMn4 and DyMn4 complexes. Simulated spectra using crystal-field multiplet calculations reproduce the experimentally observed spectra. The orientation of the molecules causes linear dichroism spectra of the 4f absorption spectra. This natural linear dichroism shows the anisotropic charge distribution of the rare-earth 4f state in the tetragonal crystal field despite the small 4f crystal-field splitting. The magnetic moment of the molecule is dominated by the rare-earth moment revealing a considerably large contribution of orbital moment. From a sum-rule analysis of experimental and simulated x-ray magnetic circular dichroism, we determined corrected spin and orbital Dy moments at low temperature (14 K) within a magnetic field of 7 T. We find a significant angular dependence of the Dy magnetic moments, indicating the presence of fourth-order magnetic anisotropy.
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页数：10
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