超导魔角扭曲三层石墨烯具有竞争性的磁性顺序和更多的同质性
Ayshi Mukherjee1, Surat Layek2, Subhajit Sinha3,4
1Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India. ayshimukherjee@gmail.com.
Nature materials
|May 22, 2025
概括
我们在魔法角度扭曲的三层石墨烯中发现了与超导性竞争的平面磁性秩序的证据. 这一发现有助于解释这种材料中复杂的电子行为.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子材料是一种量子材料.
背景情况:
- 在魔法角度扭曲的三层石墨烯中非传统的超导性背后的机制仍然不清楚.
- 理论模型表明磁性秩序和超导之间的潜在相互作用.
研究的目的:
- 为在魔法角度扭曲的三层石墨烯中与超导性共存的内平面磁性秩序提供直接实验证据.
- 用电传输测量来研究磁性秩序和超导状态之间的关系.
主要方法:
- 电传输测量是在魔法角度扭曲的三层石墨烯上进行的.
- 在不同温度和平面内磁场下,在超导状态下切换事件的分析.
- 在与超导体制相邻的正常区域中研究磁阻.
主要成果:
- 在超导状态下观察到非单调和歇斯底里切换事件,表明具有竞争性的磁性秩序.
- 在正常区域确定了歇斯底里和线性正磁电阻,进一步支持平面内磁性秩序.
- 估计了超流体刚度 (Js ≈ 0.15 K),并观察到一个扩大的Berezinskii-Kosterlitz-Thouless过渡.
结论:
- 这项研究提供了直接的证据,证明平面内磁性秩序与魔法角度扭曲的三层石墨烯中的超导性竞争.
- 这些发现限制了由磁波动驱动的间隔连贯磁顺序和超导的理论模型.
- 这种行为表明,由于moiré的不均性,该系统充当了约瑟夫森结的网络.
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