Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.23: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Insertable 4He sample probe for combined microwave and dc electrical transport measurements — •Oleksandr V. Dobrovolskiy1,2, Jörg Franke1, and Michael Huth1 — 1Physikalisches Institut Goethe-Universität, Frankfurt am Main, Germany — 2Department of Physics, Kharkiv National University, Ukraine
Combined microwave and dc electrical transport measurements at low temperatures represent a valuable experimental method in many research areas. In particular, when samples are conventional superconductors, a typical experiment requires a combination of helium temperatures, a wide range of magnetic fields, and the utilization of coaxial lines along with the usual dc wiring. We report on the general design features and the microwave performance of a home-made low-temperature sample probe, with a measurement bandwidth tested from dc to 20 GHz. Equipped with 6 coaxial cables, a heater, Hall and temperature sensors, the probe fits into a ⊘32 mm shaft. We present our setup, describe the calibration procedures, and give examples of experiments enabled by this system. The proposed setup will be essential for a systematic study of the dc- and ac-response of the vortex dynamics in nanopatterned superconductors subjected to combined dc and microwave stimuli. Besides, it will be valuable for the investigation of a broad class of nonlinear stochastic systems where a combination of dc and high-frequency ac driving in a wide temperature range is necessary.