{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"7b3b19d9c995ec6fb9f7852ea8b8bee55fc364cac540d3b1985fff39c191266e","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["3523c269088e6bf0666d32be0c86dd4df282efbdd5f4e2ac9df1adf7fd1b6282","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"43f4f2ccc1926ec6421e9881ad56b3e335e028a284a0964211683c765970bc79","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":["ai:gpt-5.5"],"external_id":"cm.kitaev-materials.intermediate-field-phase","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"An in-plane magnetic field destroys the zigzag magnetic order of $\\alpha$-RuCl3 near 70 to 80 kOe, and at higher field the spins line up with the field. Whether a separate spin-liquid phase exists between these regimes, or the observed features come from a smooth crossover and from structurally different pieces of the crystal, is unresolved.","posed_since":"2017","precise":"For in-plane fields between the zigzag critical field $H_c1$ (about 70 to 80 kOe) and full polarization, determine whether a distinct thermodynamic phase bounded by phase transitions (in specific heat, magnetocaloric effect, magnetostriction) exists, whether its excitations form a fractionalized continuum or multi-magnon bound states, and whether the oscillatory features of $\\kappa_{xx}(H)$ at $T < 1\\ \\mathrm{K}$ in this window mark intrinsic transitions or shifted phase boundaries of stacking inclusions. An answer is a phase diagram with identified boundaries and a classification of the intermediate state.","problem_ref":"3523c269088e6bf0666d32be0c86dd4df282efbdd5f4e2ac9df1adf7fd1b6282","references":"","settled_by":"Thermodynamic measurements resolving or excluding a second transition above $H_c1$ on stacking-controlled crystals, combined with neutron and THz spectra fitted by a calibrated spin model.","status_note":"2025 and 2026 neutron and model studies (arXiv:2504.11458, arXiv:2601.16850) report intermediate regimes, while the $\\kappa_{xx}$ oscillations of Czajka et al. (Nature Physics 2021) were attributed to field-induced transitions (Bruin et al., APL Materials 2022) and a 2026 preprint (arXiv:2605.13444) traces features beyond the zigzag regime to shifted antiferromagnetic boundaries of structural inclusions rather than nonmagnetic phases.","title":"Is there a field-induced spin-liquid phase in 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