Studies of superconductors using microwave technique
Department of Basic Science, The University of Tokyo
I will introduce several examples of studies of superconductor using microwave complex conductivity measurement, together with techniques developed for those purposes. More explicitly, the followings are the list of the subject I am going to talk.
(1) General introduction –What kind of information can we know?
(2) Magnitude of the penetration depth measurement of high-Tc cuprate
(3) Nonlinear Meissner effect
(4) Flux flow of superconductors
(i) Mystery of the QP scattering time in the vortex core
(ii) flux-flow Hall effect study to resolve above mystery
(iii) Gap spectroscopy for Fe based superconductors
(5) Superconductivity fluctuation measurement by the broadband technique
(i) Possible mechanisms of high-Tc superconductivity in cuprates
(ii) How large the superconductivity fluctuation of Fe chalcogenides?
(6) Other collective excitation of the quantum condensate
(7) Other than bulk
(i) Measurement of very thin films: Fe chalcogenide films
(ii) Measurement of powder samples: Fullerene, DNA
(8) Local conductivity measurement by microwave microscope
Prof. Atsutaka MAEDA is a full professor of Department of Pure and Applied Sciences/ Department of Basic Science, The University of Tokyo. He is an experimental scientist of condensed matter physics, material science. He has been a physics-and-chemistry program chair of International Symposium on Superconductivity (ISS) for these couple of years. He won the superconductivity science and technology prize in 2008, and was awarded to be a Japan Society of Applied Physics Fellow in 2015. He has been engaged in studies of broad aspects of quantum condensate, such as charge-density wave and superconductivity, probed by microwave techniques in many cases. His research highlights include discovery of novel type of sliding conduction in blue bronze, peculiar and universal features of the electronic structure of the vortex core in many superconductors, experimental determination of the dynamic phase diagram of driven vortices and its application to the physics of solid-solid friction, suppression of the phase separation in Fe chalcogenides by the epitaxial film growth and its physical property investigation etc.