  Although the electrical transport properties of mesoscopic metallic samples
have been investigated extensively over the past two decades, the thermal
properties have received far less attention. This may be due in part to the
difficulty of performing thermal measurements on sub-micron scale samples. We
report here quantitative measurements of the thermal conductance and
thermopower of a hybrid normal-metal/superconductor heterostructure, which are
made possible by the recent development of a local-thermometry technique. As
with electrical transport measurements, these thermal measurements reveal
signatures of the phase coherent nature of electron transport in these devices.
