{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"660c898ec0fbf554b6b4c5d4bd610d7d5b1c87eba60086b03ff04d0f50eb5b45","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"9e17cc1062bf390f333d1dc9f0c51ba56c506d6ea4e9e9ba001fe48c4a628677","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.cuprates.overdoped-superfluid","kind":"phenomenon","literature_status":"contested","n":"1","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":null,"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":"33286b282c1fb96cb91bff4da60a136df7a46ad812b8b7d94aa4475e741e6e76"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"95199665e02558fa051d9ac47b0ced37594324b8118198e5adfd6736855bb467","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c23e345a9e2fbf0ba7f03cc7fd777988e144a0bbec0631d920c61ce846ffbf31","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"JvvSaMzbzLzJvgZsiCdUz98nAWd1Rh9lJJzLN-o3sdfxD06fxi2SAP_CWhw_9xDNJGhYmaEwg5XVaTDUYFHrDw"},"schema":"pubphys.envelope/1"},"record_hash":"95199665e02558fa051d9ac47b0ced37594324b8118198e5adfd6736855bb467","leaf_index":934}