KHUNTIA, P.; VELÁZQUEZ, Matias; BARTHÉLEMY, Quentin; BERT, Fabrice; KERMARREC, Edwin; LEGROS, A.; BERNU, Bernard; MESSIO, L.; ZORKO, Andrej; MENDELS, P.

doi:10.1038/s41567-020-0792-1

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KHUNTIA, P.
Laboratoire de Physique des Solides [LPS]
Department of Physics

VELÁZQUEZ, Matias
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Science et Ingénierie des Matériaux et Procédés [SIMaP]

BARTHÉLEMY, Quentin
Laboratoire de Physique des Solides [LPS]

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Article de revue

Ce document a été publié dans

Nature Physics. 2020-04, vol. 16, n° 4, p. 469-474

Nature Publishing Group

Résumé en anglais

Spin liquids are exotic phases of quantum matter challenging Landau's paradigm of symmetry-breaking phase transitions. Despite strong exchange interactions, spins do not order or freeze down to zero temperature. While well-established for 1D quantum antiferromagnets, in higher dimension where quantum fluctuations are less acute, realizing and understanding such states represent major issues, both theoretical and experimental. In this respect the simplest nearest-neighbor Heisenberg antiferromagnet Hamiltonian on the highly frustrated kagome lattice has proven to be a fascinating and inspiring model. The exact nature of its ground state remains elusive and the existence of a spin-gap is the first key-issue to be addressed to discriminate between the various classes of proposed spin liquids. Here, through low-temperature Nuclear Magnetic Resonance (NMR) contrast experiments on high quality single crystals, we single out the kagome susceptibility and the corresponding dynamics in the kagome archetype, the mineral herbertsmithite, ZnCu$_3$(OH)$_6$Cl$_2$. We firmly conclude that this material does not harbor any spin-gap, which restores a convergence with recent numerical results promoting a gapless Dirac spin liquid as the ground state of the Heisenberg kagome antiferromagnet.< Réduire

DOI

http://dx.doi.org/10.1038/s41567-020-0792-1

Project ANR

Liquides de Spin Quantiques sur réseau Kagome - ANR-18-CE30-0022

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026