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4-spin Plaquette Singlet State in the Shastry-Sutherland compound SrCu2(BO3)2

Zayed, ME; Rüegg, C; Larrea, J; Läuchli, AM; Panagopoulos, C; Saxena, SS; Ellerby, M; ... Ronnow, HM; + view all (2017) 4-spin Plaquette Singlet State in the Shastry-Sutherland compound SrCu2(BO3)2. Nature Physics , 13 pp. 962-966. 10.1038/nphys4190. Green open access

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Abstract

The study of interacting spin systems is of fundamental importance for modern condensed-matter physics. On frustrated lattices, magnetic exchange interactions cannot be simultaneously satisfied, and often give rise to competing exotic ground states1. The frustrated two-dimensional Shastry–Sutherland lattice2 realized by SrCu2(BO3)2 (refs 3,4) is an important test case for our understanding of quantum magnetism. It was constructed to have an exactly solvable 2-spin dimer singlet ground state within a certain range of exchange parameters and frustration. While the exact dimer state and the antiferromagnetic order at both ends of the phase diagram are well known, the ground state and spin correlations in the intermediate frustration range have been widely debated. We report here the first experimental identification of the conjectured plaquette singlet intermediate phase in SrCu2(BO3)2. It is observed by inelastic neutron scattering after pressure tuning to 21.5 kbar. This gapped singlet state leads to a transition to long-range antiferromagnetic order above 40 kbar, consistent with the existence of a deconfined quantum critical point.

Type: Article
Title: 4-spin Plaquette Singlet State in the Shastry-Sutherland compound SrCu2(BO3)2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/nphys4190
Publisher version: http://dx.doi.org/10.1038/nphys4190
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Magnetic properties and materials, Phase transitions and critical phenomena, Structure of solids and liquids
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1556323
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