Low-temperature spin dynamics of ferromagnetic molecular ring {Cr8Y8}
| Autor: | Wentao Jin, Dongfeng Chen, Yinguo Xiao, Gerrit Günther, Margarita Russina, Kai Sun, Lei Qin, Wiebke Lohstroh, Yuntao Liu, Lijie Hao, Yan-Zhen Zheng, Zhendong Fu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Large scale facilities for research with photons neutrons and ions
02 engineering and technology 010402 general chemistry lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences Heat capacity Inelastic neutron scattering law.invention symbols.namesake law lcsh:TA401-492 Electron paramagnetic resonance Spin (physics) Physics Zeeman effect Condensed matter physics 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials lcsh:QC170-197 Ferromagnetism Excited state symbols lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Ground state |
| Zdroj: | npj Quantum Materials, Vol 5, Iss 1, Pp 1-6 (2020) |
| ISSN: | 2397-4648 |
| Popis: | The spin dynamics of {Cr8Y8}, a rare example of ferromagnetic molecular rings, has been studied by inelastic neutron scattering (INS) and heat capacity (HC) methods. Clear evidence of low-lying magnetic excitation has been found. Magnetic Schottky anomalies are observed in low-temperature (low-T) HC curves measured under various fields and can be well fitted with a multi-level Schottky term, giving important information on the energy gaps between spin levels. The INS results obtained on TOFTOF and NEAT time-of-flight spectrometers show INS peaks corresponding to the transitions within S = 12 ground states and between the S = 12 ground state and the S = 11 excited state. The single-J model with a unique exchange constant J = 0.151 meV can well reproduce the low-lying energy levels and their Zeeman splitting upon applied magnetic fields. This work shows that the single-J model can be a good approach for the low-T spin dynamics of {Cr8Y8} and may have general significance for other weak ferromagnetic molecular rings. Determination of the Cr3+-Cr3+ exchange constant in {Cr8Y8} will benefit the study on the complicated magnetic interactions in chromium lanthanide complexes. The zero-field splitting which is suggested by HC data still calls for EPR or high-resolution INS technique to verify. |
| Databáze: | OpenAIRE |
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