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Abstracts
WEDNESDAY 10 AUGUST
T1
Cryogenic Techniques and Low Temperature Properties of Matter
Christian Enns
Heidelberg University, Germany
The most common method for producing temperatures well below one Kelvin
is the
3
He/
4
He dilution refrigerator. If equipped with a well-designed nuclear
demagnetization stage such systems can reach temperatures in the low microkelvin
range. We will discuss some basic aspects of these cooling techniques and
will point out recent developments. In addition, methods to measure very
low temperatures are presented, again with an emphasis on new techniques.
Since the first liquefaction of helium many fascinating properties of matter at
low temperatures have been discovered. A brief overview will be given, while
highlighting a few specific examples.
T2
Bose condensation and superfluidity in liquid
4
He
William Vinen
University of Birmingham, UK
A description of the superfluid properties of liquid
4
He at temperatures below
the lambda-transition (metastable frictionless flow, two-fluid effects, and the
quantization of superfluid circulation) will be followed by an account of the way
in which Bose condensation in a system of interacting particles can lead to such
properties.
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