Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements

Sharples JW, Collison D, McInnes EJL, Schnack J, Palacios E, Evangelisti M (2014)
Nature Communications 5.

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Abstract
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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Sharples JW, Collison D, McInnes EJL, Schnack J, Palacios E, Evangelisti M. Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nature Communications. 2014;5.
Sharples, J. W., Collison, D., McInnes, E. J. L., Schnack, J., Palacios, E., & Evangelisti, M. (2014). Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nature Communications, 5.
Sharples, J. W., Collison, D., McInnes, E. J. L., Schnack, J., Palacios, E., and Evangelisti, M. (2014). Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nature Communications 5.
Sharples, J.W., et al., 2014. Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nature Communications, 5.
J.W. Sharples, et al., “Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements”, Nature Communications, vol. 5, 2014.
Sharples, J.W., Collison, D., McInnes, E.J.L., Schnack, J., Palacios, E., Evangelisti, M.: Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements. Nature Communications. 5, (2014).
Sharples, Joseph W., Collison, David, McInnes, Eric J. L., Schnack, Jürgen, Palacios, Elias, and Evangelisti, Marco. “Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements”. Nature Communications 5 (2014).
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