Abstract: The unique abilities of using XSTM to study the heterostructures allows us to explore the interesting properties of novel interfacial structures. In the first case, the detailed investigation of the electronic structures across the interface between the superconductor YBa2Cu3O7-δ and the ferromagnetism La0.7Ca0.3MnO3 is studied. The proximity induced triplet state is demonstrated from the evolution of interfacial electronic properties at the interface. Results also reveal the spatial resolved coherent length between superconductor and ferromagnetism.
The second case illustrated that charge density wave (CDW) order found as a universal factor in underdoped high-Tc supercon- ductors. However, a clear picture of the CDW order through CuO2 planes remains an open question. The cross-sectional scanning tunneling microscopy and spectroscopy measurement on YBa2Cu3O6.81 thin film are probed both atomic and electronic structure simultaneously along the c-axis. The real-space observation reveals the existence of the charge modulation on CuO2 plane and CuO chain layers.
The third case shows the surface morphology and electronic structure of YBa2Cu3O7-δ (YBCO) nanostructures investigated using scanning tunneling microscopy and spectroscopy at 110 K and 24 K. The shape of nanostructures is changed from a square-like grain to a rectangle-like grain with increasing temperature from 24 K to 110 K. Interestingly, an anisotropic density of states (DOS) distribution is observed on nanostructures at 110 K but a uniform DOS distribution at 24 K
scanning tunneling microscopy (STM)