{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f7729509e022cd524ac6895899b11aa2ab6effdcf3cead8385be5fad23275760","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","f1b919a43761d8c21e910f6bbe40db80a3ece07e6a002d8b48a5e397969eac69"],"salt":"56df8c2e0a6c796b1f0fc15752c63ed73ec31ba3318252a17f2ed6252a345f73","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.fese-sto-interface.transport-tc","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"Different methods give very different transition temperatures, from about 40 K in transport on protected films and about 65 K in magnetic measurements to a single report above 100 K, so even the basic number is uncertain.","posed_since":"","precise":"Ex situ transport on capped monolayers gives onset $T_c \\sim 40\\,\\mathrm{K}$ with lower zero-resistance temperatures, diamagnetic (Meissner) onset appears near 65 K (Zhang et al., Science Bulletin 60, 1301, 2015), photoemission gap closing occurs near 55-65 K, and one in situ four-probe study reported $T_c$ above 100 K (Ge et al. 2015) that has not been reproduced. Determine the onset and zero-resistance $T_c$ of uncapped monolayer FeSe/$\\mathrm{SrTiO_3}$ in situ, and whether the gap-closing temperature marks phase coherence or only pairing.","problem_ref":"f1b919a43761d8c21e910f6bbe40db80a3ece07e6a002d8b48a5e397969eac69","references":"","settled_by":"In situ transport and mutual-inductance measurements on uncapped films by several groups, with the fluctuation regime characterized.","status_note":"Nernst measurements on ultrathin FeSe/$\\mathrm{SrTiO_3}$ find superconducting fluctuations only below about 1.2 times the onset $T_c$ and suggest the gap seen above $T_c$ in photoemission may have a non-superconducting origin (Kobayashi, Ogawa and Maeda, Physical Review B 112, 094525, 2025).","title":"What is the zero-resistance transition temperature of monolayer FeSe on 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