Spin-singlet to triplet Cooper pair converter interface
Spin-singlet to triplet Cooper pair converter interface
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DOI：
10.1038/s42005-021-00567-7
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发表时间：
2021-04-08
影响因子：
5.5
通讯作者：
Cespedes, Oscar
中科院分区：
文献类型：
--
作者：
Rogers, Matthew;Walton, Alistair;Cespedes, Oscar
沉积在金属基底上的磁性分子构成了一种设计分子自旋特性的方法，并在低功耗信息存储器件中具有潜在的应用。研究了超导体/分子/正常金属异质结构，证明了在金属-分子界面处的自旋有序和邻近诱导超导性质，由于准粒子介导的超电流的无耗散性质，磁性和超导功能的结合使量子计算和信息存储中的低能自旋转移和磁开关成为可能。在这里，我们提出了一个系统，紧急自旋有序和扩散的库珀对实现在一个非本征磁性或超导金属分子界面。电子输运，磁强计和低能量μ子自旋旋转被用来探测这些结构中的时间反演对称性破缺。通过比较迈斯纳驱逐在一个系统中，包括一个铜/C-60自旋转换器接口，一个没有，我们观察到的顺磁贡献，可以解释由于自旋单重库珀对状态转换成奇频三重态。这些结果证明了金属-分子界面实现单线态到三线态库珀对转换的潜力，这种能力不存在于金属或分子中，可用于产生和控制自旋极化无耗散电流的扩散。
Magnetic molecules deposited on a metallic substrate constitute a method to engineer the spin properties of the molecule and has potential application in low-power information storage devices. Here, the authors investigate a superconductor/molecule/normal metal heterostructure and demonstrate spin-ordering and proximity induced superconducting properties at the metallo-molecular interface.Combining magnetic and superconducting functionalities enables lower energy spin transfer and magnetic switching in quantum computing and information storage, owing to the dissipationless nature of quasi-particle mediated supercurrents. Here, we put forward a system where emergent spin-ordering and diffusion of Cooper pairs are achieved at a non-intrinsically magnetic nor superconducting metallo-molecular interface. Electron transport, magnetometry and low-energy muon spin rotation are used to probe time-reversal symmetry breaking in these structures. By comparing the Meissner expulsion in a system including a Cu/C-60 spin-converter interface to one without, we observe a paramagnetic contribution that can be explained due to the conversion of spin-singlet Cooper pair states into odd-frequency triplet states. These results demonstrate the potential of metallo-molecular interfaces to achieve singlet to triplet Cooper pair conversion, a capability not present in either metal or molecule separately that could be used in the generation and controlled diffusion of spin polarised dissipationless currents.