Abstract
The performance of ruthenium oxide thermistors on sapphire as bolometers for particle detection around 100 mK is investigated. It is shown that the modest pulse height of the signals is due to a reduced thermal responsivity in pulse conditions with respect to the zero-frequency value and not to the large effective capacitance of the bolometer. Indeed, the effective thermal capacitance of the RuO 2 measured in pulse conditions with a time constant of up to tens of milliseconds is compatible with only Debye and electronic contributions while the nuclear terms do not contribute. The low pulse response is attributed to poor diffusivity in the inhomogenous structure of the thick film sensor. A comparison with the performance of a sapphire-germanium bolometer also shows the limits due to device noise in the energy resolution of the RuO 2 bolometer. The low thermal capacity in the dynamic range of materials with high nuclear moments supports the feasibility of special high-resolution bolometers made with materials so far excluded.
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