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Abstract
We have used a cavity perturbation technique to probe the electrodynamic response of various low-dimensional molecular metals in high magnetic fields. We discuss some of the technical aspects of these measurements and go on to present recent experimental data obtained in magnetic fields of up to 33 T. In addition to providing finite frequency information in this frequency range, which is highly relevant to narrow bandwidth conducting systems, we show how the extreme flexibility and sensitivity of this technique offers great potential for probing the properties of novel materials in high magnetic fields.
Highlights
The use of microwave techniques to probe the electrodynamic properties of metals is not new
Low-dimensional molecular conductors [2] encompass much of the physics common to high-temperature superconductors (HTS), HF metals and low-dimensional systems (LDS), e.g. superconductivity, antiferromagnetism, etc
Effect in the BETS compound have been unsuccessful, while Shubnikov—de Haas (SdH) oscillations are only observed in the ET compound at very high fields ('40 T) [21] or, in one case, when the sample is subjected to large hydrostatic pressures ('8 kbar) [22]
Summary
The use of microwave techniques to probe the electrodynamic properties of metals is not new. A particular attraction to experimentalists is the possibility, through subtle chemistry, to alter the structures of molecular conductors without compromising sample quality, which is often exceptionally high [3] This permits a comprehensive investigation of the correlation between chemical structure and physical properties [3]. Due to the exceptional quality of these materials, it is possible to observe beautiful quantum effects at low temperatures, and in magnetic fields of a few tesla and upwards (see below) which, in turn, allow an accurate determination of the electronic structure, or Fermi surface (FS) [3]. Destruction of the superconducting state (achieved in fields of the order of few tesla), exhibited by certain classes of organic conductor, permits Fermiology studies of the normal metallic state [3]; this has not been possible in HTS due to huge superconducting sample quality. We will show how such a capability can provide considerable insight into many of the problems outlined above
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