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• W3024584989 abstract "Abstract The spin dynamics of {Cr 8 Y 8 }, 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 {Cr 8 Y 8 } and may have general significance for other weak ferromagnetic molecular rings. Determination of the Cr 3+ -Cr 3+ exchange constant in {Cr 8 Y 8 } 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." @default.
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• W3024584989 date "2020-05-18" @default.
• W3024584989 modified "2023-10-16" @default.
• W3024584989 title "Low-temperature spin dynamics of ferromagnetic molecular ring {Cr8Y8}" @default.
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• W3024584989 doi "https://doi.org/10.1038/s41535-020-0234-4" @default.
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