The thermal conductivity of AGOT graphite between 0·3 and 3 K

A New Type of Carbon Resistance Thermometer with Excellent Thermal Contact at Millikelvin Temperatures

“…Self-heating curves at the base temperature of the fridge are found to be identical within measurement error for the two carbon thermometers we made (not shown). The conclusion above is further strengthened by a remarkable observation that the thermal resistance of graphite calculated for the geometry of our thermometer using the extrapolated values of the thermal conductivity measured above 0.3K 25 , is within a factor of 2 from that of Th-1 over the whole T range.…”

A replacement for AGOT graphite?

“…Graphite supports can therefore be used as a 'passive' heat switch, to allow a relatively rapid cool-down of a structure which must be thermally isolated when cold. AGOT graphite is a pitch bonded graphite which is known to be a very good insulator below 1 K [1]. However, it is no longer commercially available.…”