{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2a7f677b395d80c211bd5360cd4a220e8bae5ef11824a88a906259ac6e7fe92f","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f87ee0b9093d19d5296556caad606bd851b2c0df313ac1c2864191953ef42ea2","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.triangular-kagome-spin-liquids.dirac-spin-liquid-material","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"In a Dirac spin liquid the spinons have energies growing linearly with momentum near a few points, so the neutron signal rises linearly with energy and forms cones. Candidates have been reported in kagome and triangular compounds, but confirmation in independent materials is lacking.","posed_since":"","precise":"In candidate materials (kagome YCu3(OH)6Br2[Br_x(OH)_1-x], triangular Yb-based compounds), establish the $U(1)$ Dirac spin liquid by its signatures: a dynamic structure factor $S(q,\\omega)$ with conical continua at the predicted momenta and low-energy intensity $\\sim \\omega$, a magnetic heat capacity $C\\sim T^2$, and monopole excitations at the predicted momenta. An answer is a material in which at least two such signatures are reproduced across samples and match a parton or numerical calculation of the Dirac spin liquid on that lattice.","problem_ref":null,"references":"","settled_by":"Inelastic neutron scattering with resolution below 0.1 J resolving conical continua, plus heat capacity and thermal conductivity down to about 0.05 K, on crystals with characterized site disorder.","status_note":"Zeng et al. (Nature Physics 2024, arXiv:2310.11646) reported conical spinon continua in YCu3(OD)6Br2[Br_0.33(OD)_0.67]; confirmation in independent compounds is lacking.","title":"Has a Dirac spin liquid been realized in a 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