Soulier Mathias, Sengupta Shamashis, Pashkevich Yurii G, Capu Roxana, Thompson Ryan, Khmaladze Jarji, Monteverde Miguel, Dumoulin Louis, Munzar Dominik, Bernhard Christian, Sarkar Subhrangsu
Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, University of Fribourg, Fribourg, Switzerland.
Université Paris-Saclay, CNRS/IN2P3 IJCLab, Orsay, France.
Nat Commun. 2025 Jul 1;16(1):5900. doi: 10.1038/s41467-025-61014-7.
Non-reciprocal transport in solids under time-reversal symmetry is of great current interest. Here we show that YBaCuO(YBCO)/Nd(CaSr)MnO(NCSMO) multilayers are promising candidates. By rectifying environmental electromagnetic fluctuations, they generate a spontaneous voltage of tens of millivolts, that can drive a persistent current across external circuits. The underlying ratchet-type potential presumably originates from the complex domain state of the NCSMO layers which host several nearly degenerate magnetic, electronic and polar orders. Particularly important appears to be the competition between a charge/orbital ordered majority phase with polar moments and a nonpolar ferromagnetic minority phase. A central role is also played by the adjacent YBCO layers that are too thin (≤10 nm) to fully screen the electric fields emanating from the NCSMO layers. These multilayers are useful for energy harvesting over broad temperature and magnetic field ranges, and for tunable multifunctional memory devices that are responsive to magnetic fields, electric currents, and electromagnetic radiation.
在时间反演对称性下固体中的非互易输运是当前备受关注的研究领域。在此我们表明，钇钡铜氧（YBCO）/钕（钙锶）锰氧（NCSMO）多层膜是很有前景的候选材料。通过整流环境电磁涨落，它们能产生数十毫伏的自发电压，该电压可驱动外部电路中的持续电流。潜在的棘轮型势大概源于NCSMO层的复杂畴态，该层存在几种近乎简并的磁、电子和极化有序态。特别重要的似乎是具有极矩的电荷/轨道有序多数相和非极性铁磁少数相之间的竞争。相邻的YBCO层也起着核心作用，这些层太薄（≤10纳米），无法完全屏蔽NCSMO层发出的电场。这些多层膜可用于在宽温度和磁场范围内收集能量，以及用于对磁场、电流和电磁辐射有响应的可调谐多功能存储器件。
