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VOLUME 46 (1987) | ISSUE 11 | PAGE 466
Scanning tunneling spectroscopy of a microcrystal of the high-temperature superconductor YBa2Cu3O9-y
A technique for producing a vacuum tunnel junction between the needle of a scanning tunneling microscope and the superconducting crystal YBa2Cu309 _ y is described. The distribution of the energy gap has been measured along surface areas ~ 1 μηι2 of microcrystals at 4 K.