Brown Philip, Semeniuk Konstantin, Wang Diandian, Monserrat Bartomeu, Pickard Chris J, Grosche F Malte
Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.
Sci Adv. 2018 Apr 13;4(4):eaao4793. doi: 10.1126/sciadv.aao4793. eCollection 2018 Apr.
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.
我们研究了高压下元素铋（Bi-III）的准周期主客体结构所支持的低温状态。我们的电子输运和磁化实验表明，Bi-III是元素中II型超导的一个罕见例子，其临界磁场上限约为2.5 T，电子-声子耦合异常强，并且在正常态下电阻率具有异常大的线性温度依赖性。这些特性可能归因于不相称主客体结构的特殊声子谱，该谱表现出额外的准声学滑动模式，这表明了一条通向强耦合超导的途径，具有提高转变温度和高临界磁场的潜力。
