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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.39: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Stripline-based resonant microwave spectroscopy to study interacting electron systems — •Christian Fella, Marc Scheffler, and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart
While conventional optical spectroscopy is well suited to study solids on energy scales dominated by band structure, it cannot access many correlated electron states. For such compounds relevant energies are often of the order of 0.1 meV or below, corresponding to frequencies of 30 GHz and below. To study the frequency-dependent conductivity of such materials, microwave experiments have to be carried out at several frequencies and at low temperatures. Here we present an experimental approach for cryogenic microwave spectroscopy on metals which is based on a 1D stripline resonator. Since the sample under study acts as ground plane, the only requirement for the geometry of the sample is a flat surface of sufficient size. To address both the frequency and temperature dependence of the sample, we measure several modes of the resonator at frequencies from 2 to 20 GHz and between room temperature and 4He temperatures. We present different resonator designs (based on commercial high-frequency laminates as well as on vapor-deposition of metals onto sapphire substrates), discuss their sensitivity and range of applicability for different samples, and compare them to other experimental techniques for microwave studies on metals at low temperatures.