Resistance Measurement of Nano-order Thickness Surface Layer of YBa2Cu3O7-y Crystal

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A surface acoustic wave technique was used to measure the surface resistance of YBa2Cu3O7-ycrystal sample. The coupling of the surface acoustic wave to carriers in the crystal was through an electrostatic potential pulse propagating along the surface of the sample. The potential pulse was screened out from the sample due to an electrostatic induction effect. Penetration depth of the potential pulse into the sample was below 1 nm from the surface at room temperature. There were different temperature dependences of the surface resistance on warming and cooling measurements. Also, the surface resistance depends on oxygen deficiency in the surface layer.