{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"453979778496501a3cbb9cd7b1e522170407aa6ad3cbb683919b9b030e60d510","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"9afa3487a60edaa1b1f1956e008a8edad4349b4bf2ad83d80afb05df340f5038","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.hydrides.magnetic-evidence","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Hydride samples are tiny and are enclosed in diamond cells, so measuring the magnetic field expulsion that defines a superconductor is hard, and some published magnetic data have been challenged.","posed_since":"2015","precise":"For H3S and LaH10 at ~ 1.5 to 1.9 Mbar, establish bulk magnetic signatures (flux expulsion, trapped flux, penetration depth $\\lambda_L$, critical current) that agree quantitatively with the resistive transitions and with the Ginzburg-Landau parameters implied by H_c2. An answer is a magnetic measurement reproduced by independent groups with consistent volume fraction and $\\lambda_L$.","problem_ref":null,"references":"","settled_by":"Independent replication of magnetization or local magnetometry on H3S or LaH10 with quantitative agreement among volume fraction, $\\lambda_L$ and H_c2.","status_note":"Nitrogen-vacancy magnetometry imaging of flux expulsion in a cerium hydride (2024) and tunneling measurement of a gap near $60\\,\\mathrm{meV}$ in H3S (2025) support superconductivity; some magnetization data sets remain disputed.","title":"Do megabar hydrides show consistent bulk magnetic evidence of superconductivity","topic_ref":"d8f6a90ffa2d9797ae166bd4e51b07a319dd484720f9647530fc1647474424b6"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"27a7eedba88ca215a2009212dc8c084ebb020e149079d310d3b01a41501b4f43","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e3d9b0e0c6c23cc9f269dbf411957f4a292ad68fbf36c9dd290361fe172ca242","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"rQQelRcL7g66kdYqYvPgEdfnv1xEzl-tW0rpJApYtupcq2slicaaTmd21L_PTVZbL4APj-tNFzbd3SHOXWdPAg"},"schema":"pubphys.envelope/1"},"record_hash":"27a7eedba88ca215a2009212dc8c084ebb020e149079d310d3b01a41501b4f43","leaf_index":1032}