{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4ff881c28997f1f16b855b51ed127718a7c664924d80dec86ce32465dfa681ce","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","80e40e0e5c18c628142fcb7bd6b645ba05c4c6a2beb552087504f5bea380a9a6","8b9193cd375011e2c1597af9a2c658adfc645084080828b1296d7c4c575ec6d7"],"salt":"4255f36a6d3626392fffba7df200c6e44ff3cd0dcdc8a22373294b74b244d0b0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.insulator-quantum-oscillations.ybb12-neutral-fermions","kind":"well-posed","literature_status":"contested","n":"1","parents":[{"note":"YbB12 is one of the Kondo insulators in the neutral-fermion question","parent_revision":"80e40e0e5c18c628142fcb7bd6b645ba05c4c6a2beb552087504f5bea380a9a6","relation":"special_case"},{"note":"","parent_revision":"8b9193cd375011e2c1597af9a2c658adfc645084080828b1296d7c4c575ec6d7","relation":"special_case"}],"plain":"YbB12 shows oscillations in resistance and magnetization, plus heat capacity and heat conduction that grow linearly with temperature as in a metal, while remaining electrically insulating.","posed_since":"2018","precise":"In YbB12, quantum oscillations in resistivity and magnetization appear in the insulating state above $\\sim 3.5e5\\,\\mathrm{G}$ (Xiang et al. 2018), heat-capacity oscillations with frequency $\\sim 6.7e6\\,\\mathrm{G}$ were reported in 2025, and zero-field specific heat and thermal conductivity have linear-in-$T$ terms (Sato et al. 2019). Determine whether these signals come from a bulk Fermi surface of charge-neutral fermions.","problem_ref":null,"references":"","settled_by":"Thermal transport and heat-capacity oscillations on crystals of varied purity, showing the fermion contribution is bulk and independent of metallic inclusions.","status_note":"Heat-capacity oscillations at a frequency matching torque and transport, with amplitude about 13 percent of the linear specific-heat coefficient, were reported in 2025 (Chen et al., Physical Review Letters 135, 156501, arXiv 2501.07471).","title":"Does insulating YbB12 host a Fermi surface of neutral fermions?","topic_ref":"eeb05b44f8dd47811bcc41ccf7d60e299af30b8c5bed6ef76c910d60049cf726"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"92cc3a219fc516644bf4545c618969ab6d58125d8d1856fe230f1d3c3b89375f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"2ee370e36a24fadbd20940917489aaffe1b48a99830dddf43c39c075b5b3b54b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"6XBq0wB2XpkXhPx1KPnJ1BHyT4sniZsk93y-LF-RC8G9KkvnSuNJ3fJ6yVth7cPY7lpkMdiDGbjDgiaIVIgvBQ"},"schema":"pubphys.envelope/1"},"record_hash":"92cc3a219fc516644bf4545c618969ab6d58125d8d1856fe230f1d3c3b89375f","leaf_index":1039}