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Study of superconducting transition in a molybdenum-copper thin film structures with the purpose of constructing the high-sensitive submillimeter TES bolometers

Highly sensitive receivers based on direct detectors of submillimeter range photons are needed for space radio astronomy. The use of transition edge sensor bolometers with low transition temperatures is one of the most promising ways to achieve appropriate sensitivity. Since it is important to have temperature of superconducting transition in the range of stable operation of used refrigerator it has been proposed to use the superconductor-normal metal bilayers showing a proximity phenomenon. Changing the thickness of superconductor and normal metal layers the temperature of the superconducting transition of the whole bilayer structure can be adjusted to the desired value. Toward this end the Mo/Cu bilayers with different layers thickness showing the superconducting transition in the temperature range 0.08-1.0 K have been experimentally tested.