{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ce81a2781c5de04c3aae5c08b93ebbaab85003bcf5239d5b49b0b605fc2d8f40","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["92cc3a219fc516644bf4545c618969ab6d58125d8d1856fe230f1d3c3b89375f","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"2c9ce202744f7399c375770d2de33dee7c468fefa913ee7354e357252820d134","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":"2","parents":[],"plain":"$\\mathrm{YbB_{12}}$ 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 $\\mathrm{YbB_{12}}$, quantum oscillations in resistivity and magnetization appear in the insulating state above $\\sim 3.5 \\times 10^{5}\\,\\mathrm{G}$ (Xiang et al. 2018), heat-capacity oscillations with frequency $\\sim 6.7 \\times 10^{6}\\,\\mathrm{G}$ 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":"92cc3a219fc516644bf4545c618969ab6d58125d8d1856fe230f1d3c3b89375f","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 $\\mathrm{YbB_{12}}$ host a Fermi surface of neutral fermions?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b77f212c60f8240b1214fcb4c771c4bd48987ba3035672e02e94659f8d5b9039","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"6853216720b7ecf65f31b637438520e62c267c1241e5aab66c4489b3e0bb6c30","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"m1qWPC0Xlqp1dtKx4cYFMu1IopiiDUIO1_p8Cr6ZlfL9rnotzbDim4j6nXdI3trbkiCzDhjGYlWI2cW0sUDAAQ"},"schema":"pubphys.envelope/1"},"record_hash":"b77f212c60f8240b1214fcb4c771c4bd48987ba3035672e02e94659f8d5b9039","leaf_index":2874}