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  • Letter
  • Open Access

Frustration on a centered pyrochlore lattice in metal-organic frameworks

Rajah P. Nutakki1,2, Richard Röß-Ohlenroth3, Dirk Volkmer3, Anton Jesche4, Hans-Albrecht Krug von Nidda5, Alexander A. Tsirlin4, Philipp Gegenwart4, Lode Pollet1,2, and Ludovic D. C. Jaubert6

  • 1Arnold Sommerfeld Center for Theoretical Physics, University of Munich, Theresienstrasse 37, D-80333 München, Germany
  • 2Munich Center for Quantum Science and Technology (MCQST), Schellingstrasse 4, D-80799 München, Germany
  • 3Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany
  • 4Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany
  • 5Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany
  • 6CNRS, Université de Bordeaux, LOMA, UMR 5798, F-33400 Talence, France

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Phys. Rev. Research 5, L022018 – Published 1 May, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022018

Abstract

Geometric frustration inhibits magnetic systems from ordering, opening a window to unconventional phases of matter. The paradigmatic frustrated lattice in three dimensions to host a spin liquid is the pyrochlore, although there remain few experimental compounds thought to realize such a state. Here, we go beyond the pyrochlore via molecular design in the metal-azolate framework [Mn(II)(ta)2], which realizes a closely related centered pyrochlore lattice of Mn spins with S=5/2. Despite a Curie-Weiss temperature of −21 K indicating the energy scale of magnetic interactions, [Mn(II)(ta)2] orders at only 430 mK, putting it firmly in the category of highly frustrated magnets. Comparing magnetization and specific-heat measurements to numerical results for a minimal Heisenberg model, we predict that this material displays distinct features of a classical spin liquid with a structure factor reflecting Coulomb physics in the presence of charges.

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Phys. Rev. Research 5, L022018– Published 1 May, 2023
  • Received 5 November 2022
  • Revised 2 February 2023
  • Accepted 21 March 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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