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Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements

Author

Listed:
  • Joseph W. Sharples

    (School of Chemistry and Photon Science Institute, The University of Manchester)

  • David Collison

    (School of Chemistry and Photon Science Institute, The University of Manchester)

  • Eric J. L. McInnes

    (School of Chemistry and Photon Science Institute, The University of Manchester)

  • Jürgen Schnack

    (Faculty of Physics, Bielefeld University)

  • Elias Palacios

    (CSIC—Universidad de Zaragoza)

  • Marco Evangelisti

    (CSIC—Universidad de Zaragoza)

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 ~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.

Suggested Citation

  • Joseph W. Sharples & David Collison & Eric J. L. McInnes & Jürgen Schnack & Elias Palacios & Marco Evangelisti, 2014. "Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6321
    DOI: 10.1038/ncomms6321
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