Coulomb Blockade Thermometry in the Milli-Kelvin Temperature Range in High Magnetic Fields

We have investigated the usability of a Coulomb blockade thermometer (CBT) at low temperatures around 50 mK and in high magnetic fields up to 27 Tesla. The experiments performed extend previous investigations both to lower temperatures and higher magnetic fields. We show that CBTs provide an easy way of magnetic field independent thermometry in an up to now problematic temperature range below the applicability of vapor pressure thermometry and above the working range of nuclear orientation thermometry, which are established methods of thermometry in magnetic fields.