Measurements of magnetic resonance and high-frequency conductivity at low temperatures and high magnetic fields

J. M. Schrama; Eva Joanna Rzepniewski; Arzhang Ardavan; R. Edwards; A.-K. Klehe; A. Kornilov; J. Singleton

doi:10.1117/12.361033

9 September 1999 Measurements of magnetic resonance and high-frequency conductivity at low temperatures and high magnetic fields

J. M. Schrama, Eva Joanna Rzepniewski, Arzhang Ardavan, R. Edwards, A.-K. Klehe, A. Kornilov, J. Singleton

Author Affiliations +

Proceedings Volume 3828, Terahertz Spectroscopy and Applications II; (1999) https://doi.org/10.1117/12.361033
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

We describe a range of techniques developed by the Oxford group for use in conjunction with the Millimeter-wave Vector Network Analyzer in measurements of magnetic resonance and high-frequency conductivity, at extremely low temperatures and high magnetic fields. Included are a variety of resonant cavity techniques. The cylindrical geometry is used to produce high-Q tunable cavities, ideally suited to measurements of the frequency and temperature dependence of, for example, cyclotron resonance of carriers in GaAs- (Ga,Al)As heterojunctions. A family of rectangular cavities has been designed specifically for measurements of the angle-dependent high-frequency conductivity of organic molecular metals; these systems allow us either to rotate the whole cavity in the external magnetic field, thus measuring the dependence of a particular component of the conductivity tensor on magnetic field orientation, or to rotate the sample within the cavity, thus measuring different components of the magneto-conductivity. We also describe a non-resonant measurement using a pressure cell with optical access permitting experiments at up to 1.8 GPa. Examples of data obtained from each technique are included.

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J. M. Schrama, Eva Joanna Rzepniewski, Arzhang Ardavan, R. Edwards, A.-K. Klehe, A. Kornilov, and J. Singleton "Measurements of magnetic resonance and high-frequency conductivity at low temperatures and high magnetic fields", Proc. SPIE 3828, Terahertz Spectroscopy and Applications II, (9 September 1999); https://doi.org/10.1117/12.361033

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KEYWORDS

Magnetism

Waveguides

Temperature metrology

Diodes

Head

Metals

Phase measurement

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