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Recently we have been paying attention to high temperature
cuprate( high-Tc ) superconductors, heavy fermion system, organic superconductors,
and so on. These materials are speculated to be unconventional superconductors
in contrast to the conventional BCS Superconductors (SC). In our laboratory,
we have been studying these novel materials by NMR, specific heat, Hall
measurements, magnetic resistance and microwave absorption measurements
in order to investigate the mechanism of SC appearance. Especially, such
measurements are done from very low temperature (。。10mK )。。to high
temperature (1000K), or in high magnetic fields ( 20Tesla ). We also have
been studying vortex states and Josephson effect.
<Superconductivity and Magnetism>
You know high-Tc SC fever has begun since 1986. There
are various kinds of SC. In our laboratory, we have been investigating
vortex states and thermal conductivity, which is one of transport phenomena,
organic superconductors, heavy fermion, and BCS theory for new SC. We also
have been studying related materials of high-Tc SC from the view point
NMR means "Nuclear Magnetic Resonance". Maybe you
know MRI.。。(Magnetic Resonance Image). You have seen a topogram of a
brain taken by MRI, haven't you? Principle of NMR is equal to that of MRI.
NMR is a powerful tool to study on the electronic states in materials from
the microscopic point of view, which is due to the hyperfine interactions
between electron spins and nuclear spins. In chemistry, biology and medicine,
NMR is also used to be an important technique.
Many high-Tc SC are type-II SC. Under moderate magnetic
fields, the superconducting states of these materials change into the vortex
states. Hall measurements are very effective in studying the motion of
vortices. Physics in this area is profound, consisting of theory of superconductivity,
quantum mechanics, electromagnetics, and fluid dynamics.
Post Address: Department of Physics,Hokkaido University,Sapporo 060-0810,Japan
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to homepage of Department of Physics.
FTP of Kumagai Group.
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Maintainer: Katsuhiko MAKI
E-mail : firstname.lastname@example.org