{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b7d5fc1a6c2e160f12861d82583adb5d1ad7f4507607d16ed30f4e56f10bccbe","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["95199665e02558fa051d9ac47b0ced37594324b8118198e5adfd6736855bb467","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"b8b42a81c2c1abc56389141b0001c45966a0ffcc98407882ab1552f6f285a3ea","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":["ai:gpt-5.5"],"external_id":"cm.cuprates.overdoped-superfluid","kind":"phenomenon","literature_status":"contested","n":"2","parents":[],"plain":"Adding holes beyond the optimum lowers the superconducting temperature, and the density of paired electrons falls in step even though the metal looks more ordinary; disorder and new physics are both proposed as the cause.","posed_since":"2016","precise":"In overdoped La2-xSrxCuO4 films the zero-temperature phase stiffness $\\rho_s0$ is proportional to $T_c$ and far below the BCS value expected from the normal-state Drude weight (2016). Determine whether d-wave BCS theory with realistic (forward and point) disorder accounts quantitatively for $\\rho_s0(p)$, the T-linear $\\rho_s(T)$, and the residual uncondensed Drude weight seen in terahertz optics, or whether intrinsic inhomogeneity or a different pairing state is required.","problem_ref":"95199665e02558fa051d9ac47b0ced37594324b8118198e5adfd6736855bb467","references":"","settled_by":"Optical, penetration-depth and tunneling data on the same overdoped films compared with disorder-averaged Bogoliubov-de Gennes calculations using independently measured scattering rates.","status_note":"Dirty d-wave calculations (2017 onward) reproduce several trends, while optical data showing a large uncondensed fraction are cited against them.","title":"Why the superfluid density collapses in overdoped cuprates","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"425f695686828b0dd84ecd6972467e095a71c835ee8f5362f83c4a4f4a7675ca","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3f112d3258d25e29fc7b2b5d79bdefa5ff72a6ce1126821b674d6fe54c129653","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"MKpqkvlrrxJD2Mkb3qgzy_mTYu3IQ1ivon6IkGGxLT8j-BDhfgylg1BVzcvWt4RdC-jF2kM4RF7Tl-q9wYdoCA"},"schema":"pubphys.envelope/1"},"record_hash":"425f695686828b0dd84ecd6972467e095a71c835ee8f5362f83c4a4f4a7675ca","leaf_index":2732}