我们研究了 bulk 单晶 Mo3Al2C 中的非 reciprocity 电传输，这是一种已知宿主晶体学手性、极化电荷密度波不稳定性以及近 8 K 超导转变的材料。通过 AC 传输测量分析第一谐波和第二谐波电阻响应，我们观察到一个明显的非 reciprocity 第二谐波信号，该信号在正常和超导相边界附近显著增强。现象上，这种响应源于外部磁场与电流诱导的内在磁化在手性晶格中的方向依赖性耦合。此外，在垂直磁场下观察到的持续非 reciprocity 响应表明了一种由电荷密度波相中出现的电极化引起的环形效应。这些结果表明，bulk Mo3Al2C 作为一种内在平台，能够调节基于手性、极性和超导性相互作用的可调非 reciprocity 传输。
英文摘要：
We investigate nonreciprocal electrical transport in bulk single-crystalline Mo3Al2C, a material known to host crystallographic chirality, a polar charge-density-wave instability, and a superconducting transition near 8 K. Using AC transport measurements to analyze the first-harmonic and second-harmonic resistance responses, we observe a distinct nonreciprocal second-harmonic signal that is significantly enhanced near the boundary of the normal and superconducting phases. Phenomenologically, this response arises from direction-dependent coupling between the external magnetic field and the current-induced intrinsic magnetization within the chiral lattice. Furthermore, a persistent nonreciprocal response observed under perpendicular magnetic fields suggests a toroidal-induced effect linked to the electric polarization emerging from the charge-density-wave phase. These results demonstrate that bulk Mo3Al2C serves as an intrinsic platform for tunable nonreciprocal transport rooted in the interplay of chirality, polarity, and superconductivity.
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