The layered transition metal dichalcogenide ${\mathrm{WTe}}_2$ has recently attracted significant attention due to the discovery of an extremely large magnetoresistance, a predicted type-II Weyl semimetallic state, and a pressure-induced superconducting state. By a careful measurement of the superconducting upper critical fields as a function of the magnetic field angle at a pressure as high as 98.5 kbar, we provide the first detailed examination of the dimensionality of the superconducting condensate in ${\mathrm{WTe}}_2$. Despite the layered crystal structure, the upper critical field exhibits a negligible field anisotropy. The angular dependence of the upper critical field can be satisfactorily described by the anisotropic mass model from 2.2 K ($T/T_c\sim 0.67$) to 0.03 K ($T/T_c\sim 0.01$), with a practically identical anisotropy factor $\gamma \sim 1.7$. The temperature dependence of the upper critical field, determined for both $H\perp ab$ and $H\parallel ab$, can be understood by a conventional orbital depairing mechanism. A comparison of the upper critical fields along the two orthogonal field directions results in the same value of $\gamma \sim 1.7$, leading to a temperature-independent anisotropy factor from near $T_c$ to $<0.01T_c$. Our findings thus identify ${\mathrm{WTe}}_2$ as a nearly isotropic superconductor, with an anisotropy factor among one of the lowest known in superconducting transition metal dichalcogenides.

中文翻译：

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层状Weyl半金属WTe2在98.5 kbar时具有近乎各向同性的超导性

层状过渡金属二卤化物 ${\mathrm{威特}}_{\mathrm{2个}}$由于发现了极大的磁阻，可预测的II型Weyl半金属态和压力诱导的超导态，近来引起了人们的极大关注。通过在高达98.5 kbar的压力下仔细测量超导上临界场与磁场角的关系，我们对超导冷凝物的尺寸进行了首次详细检查。${\mathrm{威特}}_{\mathrm{2个}}$。尽管具有层状晶体结构，上临界场仍表现出可忽略不计的场各向异性。从2.2 K（$Ť/{Ť}_C〜0.67$）至0.03 K（$Ť/{Ť}_C〜0.01$），具有几乎相同的各向异性因子 $\gamma 〜1.7$。上临界场的温度相关性，由两者决定$H\perp \mathrm{一个}b$ 和 $H\parallel \mathrm{一个}b$可以通过常规的轨道去对机制来理解。沿两个正交场方向的上临界场的比较得出相同的值。$\gamma 〜1.7$，导致附近的温度独立各向异性因子 ${Ť}_C$ 到 $<0.01{Ť}_C$。因此，我们的发现确定了${\mathrm{威特}}_{\mathrm{2个}}$ 作为一种几乎各向同性的超导体，它的各向异性系数是超导过渡金属二卤化物中已知的最低之一。