A He-3 cooled scanning tunneling microscope in UHV and high fields

We present a scanning tunneling microscope (STM) operating between 275 mK a nd room temperature in ultra-high vacuum (UHV) and in magnetic fields up to 14 T. The system features a compact STM fixed to a UHV compatible He-3 ins ert fitting into a bottom loading cryostat with a superconducting magnet. P lacing the cryostat on top of the UHV chamber allows a compact system desig n and an ideal thermalization of the STM, thus achieving a hold time of abo ut 40 h at 275 mK. We show results obtained at 275 mK on a Bi2Sr2CaCu2O8 delta single crystal. (C) 2000 Published by Elsevier Science B.V. All right s reserved.