二极管效应可能帮助在铜氧化物中寻找正确的超导机制
Diode Effect May Assist Finding Proper Superconductivity Mechanism in Copper Oxides
AI总结：
该研究通过实验发现铜氧化物超导体在无外部磁场下表现出时间反演对称性打破的二极管效应，为高温超导机制的研究提供了新约束。
摘要：
我们展示了铜氧化物高温超导体可以在没有外部磁场的情况下表现出打破时间反演对称性的现象。使用Tl₂Ba₂CaCu₂O₈微桥，我们在100 K严格无场条件下观察到显著的超导二极管效应。这种非可逆响应在磁场高达±100 Oe的情况下保持不变。我们的结果与最近关于Bi₂Sr₂CaCu₂O₈+δ中零场二极管行为的报道一致，并共同表明时间反演对称性打破可能是铜酸超导态的固有属性。这些发现显著限制了依赖时间反演对称机制的高温超导理论模型。
英文摘要：
We present measurements demonstrating that copper-oxide high-temperature superconductors can exhibit broken time-reversal symmetry in the absence of external magnetic fields. Using $Tl_{2}Ba_{2}CaCu_{2}O_{8}$ microbridges, we observe a pronounced superconducting diode effect at 100 K under strictly zero-field conditions. This nonreciprocal response remains unchanged in magnetic fields up to $\pm 100 Oe$. Our results are consistent with recent reports of zero-field diode behavior in $Bi_{2}Sr_{2}CaCu_{2}O_{8+δ }$ and together indicate that time-reversal symmetry breaking may be an intrinsic property of the cuprate superconducting state. These findings significantly constrain theoretical models of high-temperature superconductivity that rely on time-reversal-symmetric mechanisms.
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