Noise Thermometry and Electron Thermometry of a Sample-on-Cantilever System Below 1K: Towards Measurement of Persistent Currents in Normal Metal Rings

Ania Claire Bleszynski
Department of Physics, Yale University

We have used two types of thermometry to study thermal fluctuations in a microcantilever-based system below one Kelvin. We measured the temperature of a cantilever's macroscopic degree of freedom (via its Brownian motion) and its microscopic degrees freedom (via the electron temperature of a metal sample mounted on the cantilever). We find it is possible to maintain thermal equilibrium between these two temperatures and a refrigerator down to at least 300 mK. We will describe the implication of these results for the goal of studying persistent currents in normal metal rings.