期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms6321
关键词
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资金
- EPSRC (UK)
- Deutsche Forschungsgemeinschaft through Research Unit 945
- Spanish MINECO [MAT2012-38318-C03-01, MAT2013-44063-R]
- [INST 215/363-1]
- EPSRC [EP/D050782/1, EP/H006893/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H006893/1, EP/D050782/1] Funding Source: researchfish
Geometric spin frustration in low-dimensional materials, such as the two-dimensional kagome or triangular antiferromagnetic nets, can significantly enhance the change of the magnetic entropy and adiabatic temperature following a change in the applied magnetic field, that is, the magnetocaloric effect. In principle, an equivalent outcome should also be observable in certain high-symmetry zero-dimensional, that is, molecular, structures with frustrated topologies. Here we report experimental realization of this in a heptametallic gadolinium molecule. Adiabatic demagnetization experiments reach similar to 200 mK, the first sub-Kelvin cooling with any molecular nanomagnet, and reveal isentropes (the constant entropy paths followed in the temperature-field plane) with a rich structure. The latter is shown to be a direct manifestation of the trigonal antiferromagnetic net structure, allowing study of frustration-enhanced magnetocaloric effects in a finite system.
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