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    "title": "Superconductivity near 55 K in fluorine-doped samarium iron oxypnictide",
    "summary": "Ren and colleagues reported superconducting signatures in fluorine-doped samarium iron oxypnictide. Electrical resistivity began its transition at 55.0 kelvin and reached the reported zero-resistance level at 52.6 kelvin; magnetic susceptibility showed an onset of diamagnetic response at 54.6 kelvin. These observations extended the experimentally explored transition-temperature range of the layered iron-arsenide family.",
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        "date": "2008-04-13"
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          "name": "Li-Ling Sun",
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        "description": "The reported 55 kelvin is a resistive onset, not the zero-resistance or susceptibility midpoint temperature. Diffraction indicated a principal target phase together with impurity phases; the authors cautioned that actual fluorine content could be substantially lower than the nominal composition. Measurements concern the reported polycrystalline sample, with no determination of pairing mechanism or universal temperature limit. Earlier lanthanum iron-arsenide superconductivity work is a separate contribution.",
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      "statement": "# Superconductivity near 55 K in fluorine-doped samarium iron oxypnictide\n\nRen and colleagues reported superconducting signatures in fluorine-doped samarium iron oxypnictide. Electrical resistivity began its transition at 55.0 kelvin and reached the reported zero-resistance level at 52.6 kelvin; magnetic susceptibility showed an onset of diamagnetic response at 54.6 kelvin. These observations extended the experimentally explored transition-temperature range of the layered iron-arsenide family.\n\n## Scientific scope\n\nThe reported 55 kelvin is a resistive onset, not the zero-resistance or susceptibility midpoint temperature. Diffraction indicated a principal target phase together with impurity phases; the authors cautioned that actual fluorine content could be substantially lower than the nominal composition. Measurements concern the reported polycrystalline sample, with no determination of pairing mechanism or universal temperature limit. Earlier lanthanum iron-arsenide superconductivity work is a separate contribution.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nZhi-An Ren; Wei Lu; Jie Yang; Wei Yi; Xiao-Li Shen; Zheng-Cai Li; Guang-Can Che; Xiao-Li Dong; Li-Ling Sun; Fang Zhou; Zhong-Xian Zhao\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Superconductivity at 55 K in iron-based F-doped layered quaternary compound Sm[O1-xFx]FeAs](https://arxiv.org/pdf/0804.2053v1)\n",
      "summary": "Ren and colleagues reported superconducting signatures in fluorine-doped samarium iron oxypnictide. Electrical resistivity began its transition at 55.0 kelvin and reached the reported zero-resistance level at 52.6 kelvin; magnetic susceptibility showed an onset of diamagnetic response at 54.6 kelvin. These observations extended the experimentally explored transition-temperature range of the layered iron-arsenide family.",
      "title": "Superconductivity near 55 K in fluorine-doped samarium iron oxypnictide"
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    "title": "Superconductivity near 55 K in fluorine-doped samarium iron oxypnictide",
    "context": "Condensed-matter physics",
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    "what_changed": "Ren and colleagues reported superconducting signatures in fluorine-doped samarium iron oxypnictide. Electrical resistivity began its transition at 55.0 kelvin and reached the reported zero-resistance level at 52.6 kelvin; magnetic susceptibility showed an onset of diamagnetic response at 54.6 kelvin. These observations extended the experimentally explored transition-temperature range of the layered iron-arsenide family.",
    "scope": "Ren and colleagues reported superconducting signatures in fluorine-doped samarium iron oxypnictide. Electrical resistivity began its transition at 55.0 kelvin and reached the reported zero-resistance level at 52.6 kelvin; magnetic susceptibility showed an onset of diamagnetic response at 54.6 kelvin. These observations extended the experimentally explored transition-temperature range of the layered iron-arsenide family. The reported 55 kelvin is a resistive onset, not the zero-resistance or susceptibility midpoint temperature. Diffraction indicated a principal target phase together with impurity phases; the authors cautioned that actual fluorine content could be substantially lower than the nominal composition. Measurements concern the reported polycrystalline sample, with no determination of pairing mechanism or universal temperature limit. Earlier lanthanum iron-arsenide superconductivity work is a separate contribution.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The reported 55 kelvin is a resistive onset, not the zero-resistance or susceptibility midpoint temperature. Diffraction indicated a principal target phase together with impurity phases; the authors cautioned that actual fluorine content could be substantially lower than the nominal composition. Measurements concern the reported polycrystalline sample, with no determination of pairing mechanism or universal temperature limit. Earlier lanthanum iron-arsenide superconductivity work is a separate contribution.",
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