Spin Helicity in Chiral Lanthanide Chains
| Autor: | Andrei Rogalev, Annie K. Powell, Mauro Perfetti, Francesco Pineider, Lorenzo Tesi, Christopher E. Anson, Fabrice Wilhelm, Roberta Sessoli, Valeriu Mereacre, Ionut Mihalcea |
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| Rok vydání: | 2016 |
| Předmět: |
Lanthanide
Condensed matter physics Chemistry 02 engineering and technology Spin structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry Magnetization Crystallography Ferromagnetism Physical and Theoretical Chemistry Diamagnetism 0210 nano-technology Spin (physics) Anisotropy |
| Zdroj: | Inorganic chemistry. 55(20) |
| ISSN: | 1520-510X |
| Popis: | We report here the determination of the helical spin structure of three Ln-based chiral chains of the formula [Ln(Hnic)(nic)2(NO3)]n (Hnic = nicotinic acid; Ln = Tb, Dy, and Er) by means of cantilever torque magnetometry. While the Dy and Er derivatives are strongly axial (easy-axis and easy-plane anisotropy, respectively), the Tb derivative is characterized by a remarkable rhombicity. In agreement with these findings, alternating-current susceptibility reveals slow magnetic relaxation only in the Dy derivative. Dilution of DyIII ions in the diamagnetic Y-based analogue shows that the weak ferromagnetic intrachain interactions do not contribute significantly to the energy barrier for the reversal of magnetization, which is better described as a single-ion process. Single crystals of the two enantiomers of the Dy derivative have also been investigated using hard X-ray synchrotron radiation at the L-edge of the metal revealing optical activity although with negligible involvement of the 4f electrons of the ... |
| Databáze: | OpenAIRE |
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