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Proceedings Paper

Measurements of magnetic resonance and high-frequency conductivity at low temperatures and high magnetic fields
Author(s): J. M. Schrama; Eva Joanna Rzepniewski; Arzhang Ardavan; R. Edwards; A.-K. Klehe; A. Kornilov; J. Singleton
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Paper 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.

Paper Details

Date Published: 9 September 1999
PDF: 14 pages
Proc. SPIE 3828, Terahertz Spectroscopy and Applications II, (9 September 1999); doi: 10.1117/12.361033
Show Author Affiliations
J. M. Schrama, Univ. of Oxford (United Kingdom)
Eva Joanna Rzepniewski, Univ. of Oxford (United Kingdom)
Arzhang Ardavan, Univ. of Oxford (United Kingdom)
R. Edwards, Univ. of Oxford (United Kingdom)
A.-K. Klehe, Univ. of Oxford (United Kingdom)
A. Kornilov, P.N. Lebedev Physical Institute (Russia)
J. Singleton, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 3828:
Terahertz Spectroscopy and Applications II
J. Martyn Chamberlain, Editor(s)

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