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A cryogenic microwave scanning near-field probe: Application to study of high-Tc superconductors

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7 Author(s)
Lann, A.F. ; The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel ; Abu-Teir, M. ; Golosovsky, M. ; Davidov, D.
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We report a vacuum cryogenic (80 K≪T≪350 K), near-field microwave scanning system based on a 90 GHz transmitting/receiving resonant slit antenna with a capacitive measurement of the probe-sample separation. The probe allows local measurement of resistance as a function of temperature with the spatial resolution of 20-50 μm. The mm-wave probe is integrated with the eddy-current probe which allows global measurement of resistance of conducting and superconducting samples. This integrated probe is used for local study of the superconducting transition in high-Tc superconducting thin films. The sensitivity of our present mm-wave probe is sufficient for probing conductivity in the normal state and in the superconducting state close to Tc however not yet sufficient for probing conductivity variations far below superconducting transition temperature. © 1999 American Institute of Physics.

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Review of Scientific Instruments  (Volume:70 ,  Issue: 11 )