Contactless measurement of nonlinear conductivity in the radio-frequency range

Marija Došlić, Damjan Pelc, Miroslav Požek

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We have developed a system for contactless measurement of nonlinear conductivity in the radio-frequency band, and over a wide temperature range. A non-resonant circuit is used to electrically excite the sample, and the induced signal is detected by a resonant circuit whose natural frequency matches higher harmonics of the excitation. A simple modification of the probe allows non-resonant detection suitable for stronger signals. Two measurement procedures are proposed that allow significant excitation power variation, up to 150 W. The apparatus has been validated through the measurement of the nonlinear response at the superconducting transition of a high-Tc superconductor, and the nematic transition of an iron pnictide.

Original languageEnglish (US)
Article number073905
JournalReview of Scientific Instruments
Volume85
Issue number7
DOIs
StatePublished - Jul 2014

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