Bo Hao, Maosen Wang, Wenjie Sun, Yang Yang, Zhangwen Mao, Shengjun Yan, Haoying Sun, Hongyi Zhang, Lu Han, Zhengbin Gu, Jian Zhou, Dianxiang Ji, Yuefeng Nie
{"title":"sr掺杂La3Ni2O7薄膜的超导性。","authors":"Bo Hao, Maosen Wang, Wenjie Sun, Yang Yang, Zhangwen Mao, Shengjun Yan, Haoying Sun, Hongyi Zhang, Lu Han, Zhengbin Gu, Jian Zhou, Dianxiang Ji, Yuefeng Nie","doi":"10.1038/s41563-025-02327-2","DOIUrl":null,"url":null,"abstract":"<p><p>Recent studies have demonstrated ambient pressure superconductivity in compressively strained La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> thin films, yet the phase diagram of heterovalent doping-critical for advancing the field-remains underexplored. Here we report superconductivity in Sr<sup>2+</sup>-doped La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7</sub> films. The superconducting transition temperature (T<sub>c</sub>) follows an incomplete dome-like profile, maintaining similar T<sub>c</sub> values across a wide doping range (0 ≤ x ≤ 0.21) before diminishing near x ≈ 0.38. Optimally doped films achieve a T<sub>c</sub> value of ~42 K, with a high critical current (J<sub>c</sub> > 1.4 kA cm<sup>-2</sup> at 2 K) and upper critical fields (μ<sub>0</sub>H<sub>c,∥</sub>(0) = 83.7 T, μ<sub>0</sub>H<sub>c,⟂</sub>(0) = 110.3 T). Scanning transmission electron microscopy reveals that oxygen vacancies predominantly occupy planar NiO<sub>2</sub> sites-unlike apical-site vacancies in bulk samples-due to compressive strain. Additionally, the elongated out-of-plane Ni-O bonds, exceeding those in pressurized bulk samples by 4%, likely weaken the interlayer <math> <msub><mrow><mi>d</mi></mrow> <mrow> <msup><mrow><mi>z</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> </msub> </math> coupling and contribute to the reduced T<sub>c</sub> in strained films.</p>","PeriodicalId":19058,"journal":{"name":"Nature Materials","volume":" ","pages":""},"PeriodicalIF":38.5000,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Superconductivity in Sr-doped La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> thin films.\",\"authors\":\"Bo Hao, Maosen Wang, Wenjie Sun, Yang Yang, Zhangwen Mao, Shengjun Yan, Haoying Sun, Hongyi Zhang, Lu Han, Zhengbin Gu, Jian Zhou, Dianxiang Ji, Yuefeng Nie\",\"doi\":\"10.1038/s41563-025-02327-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Recent studies have demonstrated ambient pressure superconductivity in compressively strained La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> thin films, yet the phase diagram of heterovalent doping-critical for advancing the field-remains underexplored. Here we report superconductivity in Sr<sup>2+</sup>-doped La<sub>3-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>O<sub>7</sub> films. The superconducting transition temperature (T<sub>c</sub>) follows an incomplete dome-like profile, maintaining similar T<sub>c</sub> values across a wide doping range (0 ≤ x ≤ 0.21) before diminishing near x ≈ 0.38. Optimally doped films achieve a T<sub>c</sub> value of ~42 K, with a high critical current (J<sub>c</sub> > 1.4 kA cm<sup>-2</sup> at 2 K) and upper critical fields (μ<sub>0</sub>H<sub>c,∥</sub>(0) = 83.7 T, μ<sub>0</sub>H<sub>c,⟂</sub>(0) = 110.3 T). Scanning transmission electron microscopy reveals that oxygen vacancies predominantly occupy planar NiO<sub>2</sub> sites-unlike apical-site vacancies in bulk samples-due to compressive strain. Additionally, the elongated out-of-plane Ni-O bonds, exceeding those in pressurized bulk samples by 4%, likely weaken the interlayer <math> <msub><mrow><mi>d</mi></mrow> <mrow> <msup><mrow><mi>z</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> </msub> </math> coupling and contribute to the reduced T<sub>c</sub> in strained films.</p>\",\"PeriodicalId\":19058,\"journal\":{\"name\":\"Nature Materials\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":38.5000,\"publicationDate\":\"2025-08-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nature Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1038/s41563-025-02327-2\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1038/s41563-025-02327-2","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Superconductivity in Sr-doped La3Ni2O7 thin films.
Recent studies have demonstrated ambient pressure superconductivity in compressively strained La3Ni2O7 thin films, yet the phase diagram of heterovalent doping-critical for advancing the field-remains underexplored. Here we report superconductivity in Sr2+-doped La3-xSrxNi2O7 films. The superconducting transition temperature (Tc) follows an incomplete dome-like profile, maintaining similar Tc values across a wide doping range (0 ≤ x ≤ 0.21) before diminishing near x ≈ 0.38. Optimally doped films achieve a Tc value of ~42 K, with a high critical current (Jc > 1.4 kA cm-2 at 2 K) and upper critical fields (μ0Hc,∥(0) = 83.7 T, μ0Hc,⟂(0) = 110.3 T). Scanning transmission electron microscopy reveals that oxygen vacancies predominantly occupy planar NiO2 sites-unlike apical-site vacancies in bulk samples-due to compressive strain. Additionally, the elongated out-of-plane Ni-O bonds, exceeding those in pressurized bulk samples by 4%, likely weaken the interlayer coupling and contribute to the reduced Tc in strained films.
期刊介绍：
Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology.
Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines.
Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
