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

作者：Urazhdin S^*; Neils WK; Tessmer SH; Birge NO; Van Harlingen DJ

来源：Superconductor Science and Technology, 2004, 17(1): 88-92.

DOI：10.1088/0953-2048/17/1/015

We report the results of a cryogenic study of the modification of YBa2Cu3O7-delta surface electronic properties with the probe of a scanning tunnelling microscope (STM). A negative voltage applied to the sample during STM tunnelling 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 reversible surface charging for both etched and unetched samples, indicating the presence of a defect layer even on a surface never exposed to air.

• 出版日期2004-1