Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride.
Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride.
复制标题
二碲化钨中压力驱动的圆顶超导性和电子结构演化
DOI：
10.1038/ncomms8805
复制
发表时间：
2015-07-23
影响因子：
16.6
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Pan XC;Chen X;Liu H;Feng Y;Wei Z;Zhou Y;Chi Z;Pi L;Yen F;Song F;Wan X;Yang Z;Wang B;Wang G;Zhang Y
由于最近发现了高达60 T的大的不饱和磁阻，从而引起了人们的强烈研究兴趣。由于存在一个由5个电子轨道组成的小的、灵敏的费米面，我们通过施加高压来提高电子性质，并成功地引入了超导。超导电性在2.5GPa时急剧出现，在16.8GPa时迅速达到7 K的最高临界温度(T_C)，随后随着压力的升高，T_c单调下降，呈现典型的穹顶状超导相。通过理论计算，我们将超导穹顶的低压区解释为费米能级上态密度的丰富，并将Tc的高压降低归因于可能的结构不稳定性。因此，二碲化钨可能为我们理解过渡金属二卤化物中的超导现象提供了一个新的平台。
Tungsten ditelluride has attracted intense research interest due to the recent discovery of its large unsaturated magnetoresistance up to 60 T. Motivated by the presence of a small, sensitive Fermi surface of 5delectronic orbitals, we boost the electronic properties by applying a high pressure, and introduce superconductivity successfully. Superconductivity sharply appears at a pressure of 2.5 GPa, rapidly reaching a maximum critical temperature (Tc) of 7 K at around 16.8 GPa, followed by a monotonic decrease inTcwith increasing pressure, thereby exhibiting the typical dome-shaped superconducting phase. From theoretical calculations, we interpret the low-pressure region of the superconducting dome to an enrichment of the density of states at the Fermi level and attribute the high-pressure decrease inTcto possible structural instability. Thus, tungsten ditelluride may provide a new platform for our understanding of superconductivity phenomena in transition metal dichalcogenides.