• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Room-temperature superconductivity in a carbonaceous sulfur hydride
【24h】

Room-temperature superconductivity in a carbonaceous sulfur hydride

机译：碳质硫氢化物中的室温超导性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One of the long-standing challenges in experimental physics is the observation of room-temperature superconductivity(1,2). Recently, high-temperature conventional superconductivity in hydrogen-rich materials has been reported in several systems under high pressure(3-5). An important discovery leading to room-temperature superconductivity is the pressure-driven disproportionation of hydrogen sulfide (H2S) to H3S, with a confirmed transition temperature of 203 kelvin at 155 gigapascals(3,6). Both H2S and CH(4)readily mix with hydrogen to form guest-host structures at lower pressures(7), and are of comparable size at 4 gigapascals. By introducing methane at low pressures into the H2S + H(2)precursor mixture for H3S, molecular exchange is allowed within a large assemblage of van der Waals solids that are hydrogen-rich with H(2)inclusions; these guest-host structures become the building blocks of superconducting compounds at extreme conditions. Here we report superconductivity in a photochemically transformed carbonaceous sulfur hydride system, starting from elemental precursors, with a maximum superconducting transition temperature of 287.7 +/- 1.2 kelvin (about 15 degrees Celsius) achieved at 267 +/- 10 gigapascals. The superconducting state is observed over a broad pressure range in the diamond anvil cell, from 140 to 275 gigapascals, with a sharp upturn in transition temperature above 220 gigapascals. Superconductivity is established by the observation of zero resistance, a magnetic susceptibility of up to 190 gigapascals, and reduction of the transition temperature under an external magnetic field of up to 9 tesla, with an upper critical magnetic field of about 62 tesla according to the Ginzburg-Landau model at zero temperature. The light, quantum nature of hydrogen limits the structural and stoichiometric determination of the system by X-ray scattering techniques, but Raman spectroscopy is used to probe the chemical and structural transformations before metallization. The introduction of chemical tuning within our ternary system could enable the preservation of the properties of room-temperature superconductivity at lower pressures.Room-temperature superconductivity is observed in a photochemically synthesized ternary carbonaceous sulfur hydride system at 15 degrees C and 267 GPa.
机译：实验物理学中的长期挑战之一是观察室温超导性（1,2）。最近，在高压（3-5）的几个系统中报道了富含氢材料中的高温常规超导性。导致室温超导性的重要发现是硫化氢（H2S）至H3s的压力驱动的歧化，其在155种千兆帕氏菌（3,6）的确认过渡温度为203个kelvin。 H 2 S和CH（4）均易于与氢混合，以在较低压力（7）处形成客体宿主结构，并且在4种Gigapascals的尺寸具有相当的尺寸。通过将甲烷在低压力下引入H 2 S + H（2）前体混合物中，允许分子交换在富含H（2）夹杂物的范德华固体的大型van der Waals固体中;这些客座宿主结构成为极端条件下超导化合物的构建块。在这里，我们在从元素前体开始的光化学转化的碳质硫氢化物系统中报告超导性，最大超导过渡温度为287.7 +/- 1.2 kelvin（约15摄氏度），在267 +/- 10种千兆卡斯中实现。在金刚石砧座细胞中的宽压力范围内观察超导状态，从140-275只千兆卡斯，在220兆瓦塔的过渡温度下急剧上升。通过观察零阻力，磁化率高达190种千兆位的磁化率，以及在高达9个特斯拉的外部磁场下的过渡温度降低，根据吉丁堡约62个特斯拉的上部临界磁场，减少过渡温度 - 兰鄂兰州的模型零温度。氢气的光线，量子性质通过X射线散射技术限制了系统的结构和化学计量测定，但拉曼光谱用于探测金属化前的化学和结构转变。在我们的三元体系中引入化学调整可以在较低压力下保持室温超导性的性质。在15℃和267GPa的光化学合成的三元碳质硫氢化物体系中观察到室温超导。

著录项

  • 来源
    《Nature》 |2020年第7829期|373-377|共5页
  • 作者

    Snider Elliot; Dasenbrock-Gammon Nathan; McBride Raymond; Debessai Mathew; Vindana Hiranya; Vencatasamy Kevin; Lawler Keith V; Salamat Ashkan; Dias Ranga P.;

  • 作者单位

    Univ Rochester Dept Mech Engn Sch Engn & Appl Sci Rochester NY 14627 USA;

    Univ Rochester Dept Phys & Astron Rochester NY 14627 USA;

    Univ Rochester Dept Mech Engn Sch Engn & Appl Sci Rochester NY 14627 USA;

    Intel Corp Hillsboro OR USA;

    Univ Rochester Dept Phys & Astron Rochester NY 14627 USA;

    Univ Rochester Dept Phys & Astron Rochester NY 14627 USA;

    Univ Nevada Dept Chem & Biochem Las Vegas NV 89154 USA;

    Univ Nevada Dept Phys & Astron Las Vegas NV 89154 USA;

    Univ Rochester Dept Mech Engn Sch Engn & Appl Sci Rochester NY 14627 USA|Univ Rochester Dept Phys & Astron Rochester NY 14627 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号