[en] It is conceivable that the recently discovered ceramic superconducting materials, with T_c > 72 K, like the Ba₂YCu₃O_6.9, could be employed in the construction of a new generation of massive low-energy neutrino detectors, without prohibitively sophisticated cryogenic system. In this paper it is discussed the detection of low-energy neutrinos via the coherent neutral-current elastic scattering, with an 'ideal' detector, whose sensivity is quantum limited. It is well known that coherent elastic scattering is the dominant interaction of neutrinos with De Broglie wavelength smaller than nuclear size, or E_ν<<200 MeV/A^1/3, and it is insensitive to the neutrino flavour. Therefore, a measurement of the solar-neutrino flux with this type of detector could give a definitive solution to the solar-neutrino puzzle