Haga Y, Opletal P, Tokiwa Y, Yamamoto E, Tokunaga Y, Kambe S, Sakai H
Advanced Science Research Center, Japan Atomic Energy Agency, Japan.
J Phys Condens Matter. 2022 Feb 28;34(17). doi: 10.1088/1361-648X/ac5201.
Single crystals of the unconventional superconductor UTehave been grown in various conditions which result in different superconducting transition temperature as well as normal state properties. Stoichiometry of the samples has been characterized by the single-crystal x-ray crystallography and electron microprobe analyses. Superconducting samples are nearly stoichiometric within an experimental error of about 1%, while non-superconducting sample significantly deviates from the ideal composition. The superconducting UTeshowed that the large density of states was partially gapped in the normal state, while the non-superconducting sample is characterized by the relatively large electronic specific heat as reported previously.
非常规超导体UTe₂的单晶已在各种条件下生长，这些条件导致了不同的超导转变温度以及正常态性质。样品的化学计量比已通过单晶X射线晶体学和电子微探针分析进行了表征。超导样品在约1%的实验误差范围内几乎是化学计量比的，而非超导样品则明显偏离理想组成。超导的UTe₂表明，在正常态下，大的态密度部分被能隙化，而非超导样品的特征是如先前报道的具有相对较大的电子比热。
