过渡金属二硫属化物Ising超导体中的本征和本征反常金属态
Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
摘要：
二维超导体中的金属基态引起了广泛的关注，但仍处于严格的审查之中。特别是对于二维超导体，由于其对外部扰动的敏感性，超低温区的测量具有挑战性。本文在二维过渡金属二硫属化物（TMD）超导体4 Ha-TaSe 2纳米器件中观察到了由外部噪声引起的电阻饱和现象，即“非本征反常金属态”。然而，随着温度的进一步降低，通过充分过滤外部辐射，获得了本征反常金属态的可靠证据。我们的工作表明，在超低温下，二维TMD超导体中的反常金属态可以被实验揭示为量子基态。此外，在4 Ha-TaSe_2中，从单晶胞到体相，均观察到了面内临界场（Bc_2//）超过泡利顺磁极限（Bp）的Ising超导电性，这可能是由于TaSe_2亚单层之间的弱耦合所致.
英文摘要：
The metallic ground state in two-dimensional (2D) superconductors has attracted much attention but is still under intense scrutiny. Especially, the measurements in ultralow temperature region are challenging for 2D superconductors due to the sensitivity to external perturbations. In this work, the resistance saturation induced by external noise, named as "extrinsic anomalous metallic state", is observed in 2D transition metal dichalcogenide (TMD) superconductor 4Ha-TaSe2 nanodevices. However, with further decreasing temperature, credible evidence of intrinsic anomalous metallic state is obtained by adequately filtering external radiation. Our work indicates that at ultralow temperatures the anomalous metallic state can be experimentally revealed as the quantum ground state in 2D crystalline TMD superconductors. Besides, Ising superconductivity revealed by ultrahigh in-plane critical field (Bc2//) going beyond the Pauli paramagnetic limit (Bp) is detected in 4Ha-TaSe2, from one-unit-cell device to bulk situation, which might be due to the weak coupling between the TaSe2 sub-monolayers.
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