Modifying the surface electronic properties of YBa2Cu3O7 with cryogenic scanning probe microscopy

S Urazhdin, W K Neils, S H Tessmer, Norman O Birge, D J Van Harlingen
2003 Superconductors Science and Technology  
We report the results of a cryogenic study of the modification of YBa2Cu3O7-delta surface electronic properties with the probe of a scanning tunneling microscope (STM). A negative voltage applied to the sample during STM tunneling is found to modify locally the conductance of the native degraded surface layer. When the degraded layer is removed by etching, the effect disappears. An additional surface effect is identified using Scanning Kelvin Probe Microscopy in combination with STM. We observe
more » ... reversible surface charging for both etched and unetched samples, indicating the presence of a defect layer even on a surface never exposed to air.
doi:10.1088/0953-2048/17/1/015 fatcat:tf7ramtelrbezfuylb3gjditvy