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Observation of Haldane Magnetism in Organically Templated Vanadium Phosphate (enH2)0.5VPO4OHстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Samarin Aleksandr Sh, Fedotov Stanislav S., Hyun-Joo Koo, Whangbo Mike, Gippius Andrei, Zhurenko Sergei, Tkachev Alexey V., Shvanskaya Larisa V., Alexander N.Vasiliev
- Журнал: Dalton Transactions
- Год издания: 2024
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/D4DT01675K
- Аннотация: We prepared an organically templated magnet, (enH2)0.5VPO4OH (enH2 = diprotonated ethylenediamine), hydrothermally and characterized its crystal structure by powder X-ray diffraction and Fourier-transform infrared spectroscopy, and its physical properties by magnetization, specific heat and nuclear magnetic resonance measurements and density functional theory calculations. (enH2)0.5VPO4OH consists of uniform chains of V3+ (d2, S = 1) ions and exhibits Haldane magnetism with spin gap Δ = 59.3 K from the magnetic susceptibility χ(T) at µ0H = 0.1 T, which is reduced to 48.4 K at µ0H = 9 T according to the 31P shift. The NMR data evidence the formation of a spin-glass state of unpaired S = 1/2 spins at TS-G ≈ 3 K and indicate that the Haldane S = 1 spin chain segments are much longer in the organically templated magnet (enH2)0.5VPO4OH than in the ammonium counterpart NH4VPO4OH. The single-ion anisotropy D and the interchain exchange J' in (enH2)0.5VPO4OH and NH4VPO4OH were estimated in density functional calculations to find them very weak compared to the intrachain exchange J.
- Добавил в систему: Шванская Лариса Викторовна
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