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A 350 mK, 9 T scanning tunneling microscope for the study of superconducting thin films on insulating substrates and single crystals
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21.Low temperature glue, STYCAST 2850FT, from Emerson and Cuming.
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23.Piezo electric tube from EBL Products, Model EBL#2
24.Cernox sensor from LakeShore Cryotronics Inc., USA.
26.We found the two component silver epoxy EPO-TEK® E4110 from Epoxy Technology, Inc to have adequate mechanical strength for cleaving most single crystals.
27.Ion source from Tectra GmbH, Frankfurt, Germany. Model: IonEtch sputter Ion Gun, Gen II
29.Custom built SmartTable® with central hole from Newport Corporations, USA.
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We report the construction and performance of a low temperature, high field scanning tunneling microscope (STM) operating down to 350 mK and in magnetic fields up to 9 T, with thin film deposition and in situ single crystal cleaving capabilities. The main focus lies on the simple design of STM head and a sample holder design that allows us to get spectroscopic data on superconducting thin films grown in situ on insulating substrates. Other design details on sample transport, sample preparation chamber, and vibration isolation schemes are also described. We demonstrate the capability of our instrument through the atomic resolution imaging and spectroscopy on NbSe2 single crystal and spectroscopic maps obtained on homogeneously disordered NbN thin film.
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