{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"6c4b967176a24edbd0e0fa28de4df936046a2d77196086dad71ee978d13d7809","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"f87ef4695446fece68000ed2bdc3b376bacc976322918db9fd8c1566098728b0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"cm.heavy-fermions","field":"cm","n":"1","review_cite":"P. Gegenwart, Q. Si, F. Steglich, Quantum criticality in heavy-fermion metals, Nature Physics, 2008","review_link":"https://doi.org/10.1038/nphys892","review_verified":"true","summary":"In some cerium, ytterbium, samarium and uranium compounds, localized f-electron magnetic moments bind to conduction electrons and make electrons behave as if they were hundreds of times heavier. Tuning these materials with field or pressure drives zero-temperature phase transitions, and some of them become insulators or enter ordered phases whose nature is unidentified.","title":"Heavy-fermion quantum criticality, hidden order and Kondo insulators","topic_ref":null,"why":"They are the cleanest setting for quantum phase transitions in metals and host insulators and ordered states that standard band theory does not explain."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"348f0bf7a34a765b71c6ebd8ae84e9439d4dfb5f6e2b08600fcf48a04710cc34","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"049cd8f9e9306f4137be91db9cec7bc2e0996079de6496010d2632cd5edb5581","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"uC1BvrCwqBv4tXgMdc1X3ABfRsgUncRp_iPAMpf0Wv4B2JZkcaLZJaOhHciG9hIqH_5M_yXnejDzftGeoz0OCA"},"schema":"pubphys.envelope/1"},"record_hash":"348f0bf7a34a765b71c6ebd8ae84e9439d4dfb5f6e2b08600fcf48a04710cc34","leaf_index":140}