3 omega method for specific heat and thermal conductivity measurements

We present a 3 omega method for simultaneously measuring the specific heat and thermal conductivity of a rod- or filament-like specimen using a way si milar to a four-probe resistance measurement. The specimen in this method n eeds to be electrically conductive and with a temperature-dependent resista nce, for acting both as a heater to create a temperature fluctuation and as a sensor to measure its thermal response. With this method, we have succes sfully measured the specific heat and thermal conductivity of platinum wire specimens at cryogenic temperatures, and measured those thermal quantities of tiny carbon nanotube bundles some of which are only similar to 10(-9) g in mass. (C) 2001 American Institute of Physics.