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Their emergence from a condensed state near the critical temperature, $T_\\mathrm{c}$, is of particular interest. In cuprate superconductors, the behavior is not yet understood. Here, based on planar Cu and O relaxation data available in the literature, a universal metal is uncovered that reigns in the pseudogap phase, characterised by an average $1/{^{63}T}_{1\\perp} T \\approx 25$/Ks, i.e.\\@ cuprates condense at $T_\\mathrm{c}$ out of this universal metallic density of states. The metal exists up to $T","authors_text":"Abigail Lee, Juergen Haase","cross_cats":[],"headline":"A universal metal sets the critical temperature in all cuprate superconductors via a fixed nuclear relaxation ratio.","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2026-04-11T09:58:32Z","title":"Hidden Universal Metal in Cuprate Superconductors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2604.10133","kind":"arxiv","version":2},"verdict":{"created_at":"2026-05-10T15:53:21.853638Z","id":"54b7ebde-ecd8-4ddf-89a9-0a0140ae29d9","model_set":{"reader":"grok-4.3"},"one_line_summary":"A universal metal state exists in all cuprate superconductors with 1/^{63}T_{1⊥} Tc approximately constant at 25/Ks, directly tying Tc to Cu nuclear relaxation and explaining doping-dependent anisotropy.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"A universal metal sets the critical temperature in all cuprate superconductors via a fixed nuclear relaxation ratio.","strongest_claim":"a universal metal, characterized by 1/{^{63}T}_{1⊥} T_c ≈ 25/Ks, found in all materials, i.e. T_c is directly related to the Cu nuclear relaxation rate.","weakest_assumption":"That relaxation data from the literature for different cuprate materials can be directly compared without significant systematic differences in sample quality, measurement conditions, or material-specific effects that would invalidate the claimed universality."}},"verdict_id":"54b7ebde-ecd8-4ddf-89a9-0a0140ae29d9"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:cf58355537ccfe1d02947b0611ed2bddec4018067c9585a4a1a7c9dbfa3633c4","target":"record","created_at":"2026-06-01T02:03:40Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e638479d53036a8e63cfff7759ca68d1b092e8eed62ad0ed6efb87f293b1a451","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2026-04-11T09:58:32Z","title_canon_sha256":"e5446c9d2aedb694f39c53e98be088e86fd127ff97441f4059c062502c0468b0"},"schema_version":"1.0","source":{"id":"2604.10133","kind":"arxiv","version":2}},"canonical_sha256":"a650e18a0f08d0b4e7fd72c1470b2297da2ced6408985fcc24f8c2bfef12f90e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a650e18a0f08d0b4e7fd72c1470b2297da2ced6408985fcc24f8c2bfef12f90e","first_computed_at":"2026-06-01T02:03:40.358131Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-01T02:03:40.358131Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c3h7BY15+NiclHqxP/2/5VYAPL7Y+Q1GFF/WirkCZV0ZiHJBZZOuokZ+vqrQxZ4umvUb8qXoKoaa1y1xx8t0BA==","signature_status":"signed_v1","signed_at":"2026-06-01T02:03:40.359120Z","signed_message":"canonical_sha256_bytes"},"source_id":"2604.10133","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf58355537ccfe1d02947b0611ed2bddec4018067c9585a4a1a7c9dbfa3633c4","sha256:cd9afb393febfb68ec42a280b807fa581322b75cc7af2536452c87f0df73c8cb"],"state_sha256":"7c2d2d03f30061d76a0f47022f37d5cd9d7ffc98ec31f827e77450c722c6ce0d"}