Metastable Superconductivity in Two-Dimensional IrTe2 Crystals
Metastable Superconductivity in Two-Dimensional IrTe2 Crystals
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DOI：
10.1021/acs.nanolett.8b00673
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发表时间：
2018-05-01
期刊：
影响因子：
10.8
通讯作者：
Iwasa, Yoshihiro
中科院分区：
文献类型：
--
作者：
Yoshida, Masaro;Kudo, Kazutaka;Iwasa, Yoshihiro
二维（2D）材料表现出不寻常的物理和化学性质，这归因于其电子能带结构的变薄诱导的修改。最近，减少厚度被发现显着影响不仅静态电子结构，而且动态有序动力学。一级相变的有序化动力学随厚度的减小而显著减慢，仅减薄即可实现亚稳过冷态。因此，我们专注于层状二碲化铱（IrTe 2），一个电荷有序系统，通过抑制其一级跃迁转化为超导体。在这里，我们发现了一个持久的超导零电阻状态的机械剥离IrTe 2薄片。最大超导临界温度（Tc）与化学优化结果一致，并揭示了超导电性的亚稳态性质。所发现的强大的亚稳态超导性表明，2D材料是一种新的平台，可以诱导，控制和功能化大块晶体中无法达到的亚稳态电子状态。
Two-dimensional (2D) materials exhibit unusual physical and chemical properties that are attributed to the thinning-induced modification of their electronic band structure. Recently, reduced thickness was found to dramatically impact not only the static electronic structure, but also the dynamic ordering kinetics. The ordering kinetics of first-order phase transitions becomes significantly slowed with decreasing thickness, and metastable supercooled states can be realized by thinning alone. We therefore focus on layered iridium ditelluride (IrTe2), a charge-ordering system that is trans- formed into a superconductor by suppressing its first-order transition. Here, we discovered a persistent superconducting zero-resistance state in mechanically exfoliated IrTe2 thin flakes. The maximum superconducting critical temperature (T-c) was identical to that which is chemically optimized, and the emergent superconductivity was revealed to have a metastable nature. The discovered robust metastable superconductivity suggests that 2D material is a new platform to induce, control, and functionalize metastable electronic states that are inaccessible in bulk crystals.