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000278947 1001_ $$0P:(DE-Juel1)130647$$aFu, Zhendong$$b0$$eCorresponding author$$ufzj
000278947 245__ $$aLow-lying magnetic excitations and magnetocaloric effect of molecular magnet K $_{6}$ [V $_{15}$ As $_{6}$ O $_{42}$ (H $_{2}$ O)] · 8H $_{2}$ O
000278947 260__ $$aLes-Ulis$$bEDP Science65224$$c2015
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000278947 520__ $$aLow-temperature heat capacity measurements were performed on the molecular nanomagnet $\text{K}_{6}[\text{V}_{15}\text{As}_{6}\text{O}_{42}(\text{H}_{2}\text{O})] \cdot8\text{H}_{2}{\text{O}}$ (V15). The low-lying magnetic excitations are clearly evidenced by the Schottky anomalies in the specific-heat data. The energy levels determined from the low-temperature observables agree well with the three-spin model for V15. The magnetocaloric effect of V15 is examined. The maximum entropy change of $5.31\ \text{Jkg}^{-1}\text{K}^{-1}$ is found for a field change of $\Delta H =(8-0.5)\ \text{T}$ at ${\sim}1.5\ \text{K}$ . In spite of the low ground-state spin of V15, a drastic entropy change of $4.12\ \text{Jkg}^{-1}\text{K}^{-1}$ is observed for a field change of $\Delta H = (8-0.05)\ \text{T}$ at 0.4 K, which is comparable to the entropy change of some high-spin sub-kelvin magnetic coolers at such low temperatures. Anisotropy and consequent zero-field splitting result in this characteristic of V15 and may open new possibilities in the design of ultra-low-temperature molecular coolers.
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000278947 7001_ $$0P:(DE-Juel1)131047$$aXiao, Yinguo$$b1$$ufzj
000278947 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b2$$ufzj
000278947 7001_ $$0P:(DE-HGF)0$$aZheng, Yanzhen$$b3
000278947 7001_ $$0P:(DE-Juel1)130782$$aKögerler, Paul$$b4$$ufzj
000278947 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b5$$ufzj
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