Strong coupling superconductivity in a quasiperiodic host-guest structure.

Strong coupling superconductivity in a quasiperiodic host-guest structure.
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DOI:
10.1126/sciadv.aao4793
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发表时间:
2018-04
期刊:
影响因子:
13.6
通讯作者:
Grosche FM
Grosche FM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Brown P;Semeniuk K;Wang D;Monserrat B;Pickard CJ;Grosche FM

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高压铋的准周期结构引起异常强的电子-声子耦合。我们研究支持的准周期性的主-客体结构的元素铋在高压下,Bi-III的低温状态。我们的电子输运和磁化实验建立了Bi-III作为元素中II型超导性的罕见例子,具有~ 2.5 T的记录上临界场,异常强的电子-声子耦合,以及正常状态下电阻率的极大线性温度依赖性。这些性质可能是由于独特的声子谱的无公度的主-客体结构,表现出额外的准声学滑动模式,这表明一个强耦合的超导性与增强的转变温度和高临界场的潜力的途径。
The quasiperiodic structure of high-pressure bismuth gives rise to unusually strong electron-phonon coupling. We examine the low-temperature states supported by the quasiperiodic host-guest structure of elemental bismuth at high pressure, Bi-III. Our electronic transport and magnetization experiments establish Bi-III as a rare example of type II superconductivity in an element, with a record upper critical field of ~ 2.5 T, unusually strong electron-phonon coupling, and an anomalously large, linear temperature dependence of the electrical resistivity in the normal state. These properties may be attributed to the peculiar phonon spectrum of incommensurate host-guest structures, which exhibit additional quasi-acoustic sliding modes, suggesting a pathway toward strong coupling superconductivity with the potential for enhanced transition temperatures and high critical fields.
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