论文标题

范德华分层超导体PTTE的电子和拓扑特性

Electronic and topological properties of the van der Waals layered superconductor PtTe

论文作者

McGuire, Michael A., Pai, Yun-Yi, Brahlek, Matthew, Okamoto, Satoshi, Moore, R. G.

论文摘要

我们报告了超导的晶体生长以及结构和电子特性,即van der waals层次的PTTE。易于裂解的晶体具有与分层结构一致的板状形态,是从富含铂金的通量中生长的。 $ T_C = 0.57 $ K的一致测定是由Diamagnetism的发作,电阻率的零和热容量跳跃的中点做出的。观察到的行为与II型超导率一致,使用Werthamer-Helfand-Hohenberg理论估算为$ t = 0 $的上部临界场分别为143和65 OE,分别在平面中和平面中为oe。热容量不连续性接近弱耦合BCS值。密度功能理论的计算和电子结构的分析发现PTTE是具有众多表面状态的拓扑半学,但表明超导状态本身可能在拓扑上是琐碎的。角度分辨的光发射光谱揭示了与理论相当一致的正常状态费米表面,并通过实验性鉴定表面带证实了材料的总体拓扑性质。总之,这些发现将PTTE确定为可裂,拓扑和超导材料的有趣例子。

We report the crystal growth and structural and electronic properties of superconducting, van der Waals layered PtTe. Easily cleavable crystals with a plate-like morphology consistent with the layered structure were grown from a platinum rich flux. A consistent determination of $T_c = 0.57$ K is made from the onset of diamagnetism, the zero of resistivity, and the midpoint of the heat capacity jump. The observed behavior is consistent with type-II superconductivity, with upper critical field at $T=0$ estimated using the Werthamer-Helfand-Hohenberg theory to be 143 and 65 Oe for fields out of and in the plane, respectively. The heat capacity discontinuity is close to the weak coupling BCS value. Density functional theory calculations and analysis of the electronic structure finds that PtTe is a topological semimetal with numerous surface states, but suggests the superconducting state itself may be topologically trivial. Angle resolved photoemission spectroscopy reveals a normal-state Fermi surface in remarkable agreement with theory, and confirms the overall topological nature of the material by experimental identification of the surface bands. Together, these findings identify PtTe as an interesting example of a cleavable, topological, and superconducting material.

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