Short-Range Charge Transfer Between Oxide Based Superconductor-Ferromagnetic Metal Interfaces

Unlike the conventional superconductor (S) and ferromagnetic metal (F) interface, the understanding of the proximity effect between oxide-based S and F is still unclear. One particular question relates to the charge transfer length scale between S and F layers, which resulted from the lack of an appropriate experimental tool. In this talk, we show that by combining the cross-sectional scanning tunneling microscopy and spectroscopy (XSTM/S) along with scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS), the charge transfer length scale at the interfaces between YBa Cu O $_{\mathrm{-\delta }}$(YBCO) and La$_{3}$Ca$_{3}$MnO (LCMO) was revealed to have upper limit of 1 nm.\\[4pt] [1] Teyu Chien, et al., Nature Commun.4, 2336 (2013).