The nontoxic cuprate superconductor (Cu,C)Ba₂Ca₃Cu₄O_y [(Cu,C)-1234] with critical temperature of about 117 K is supposed to have great potential for applications in the liquid nitrogen temperature region. Using pulsed laser deposition technique, we successfully obtain superconducting (Cu,C)-1234 films on LaAlO₃ (001) substrates with different critical temperatures by tuning the flow rate of CO₂ gas during the deposition. The existence of CO${}_3^{2-}$ carbonate clusters in our (Cu,C)-1234 films is directly confirmed by the mid-infrared transmittance spectra measured on these films. Our results also reveal that the content of the CO${}_3^{2-}$ carbonate clusters increases with the flow rate of CO₂. The zero-resistance critical temperature (T_c0) of the films exhibits dome-like behaviour as the content of CO${}_3^{2-}$ carbonate clusters increases. Our observations not only provide clear evidence for the existence of CO${}_3^{2-}$ carbonate clusters in the films, but also testify that the content of CO${}_3^{2-}$ carbonate clusters has considerable influence on the superconducting properties of the films.

临界温度约为117 K的无毒铜酸盐超导体（Cu，C）Ba ₂ Ca ₃ Cu ₄ O _y [（Cu，C）-1234]被认为在液氮温度范围内具有巨大的应用潜力。通过使用脉冲激光沉积技术，我们通过调节沉积过程中的CO ₂气体流速，成功地在具有不同临界温度的LaAlO ₃（001）衬底上获得了超导（Cu，C）-1234膜。一氧化碳的存在${}_3^{2-}$我们的（Cu，C）-1234薄膜中的碳酸盐团簇直接由这些薄膜上测得的中红外透射光谱证实。我们的结果还表明，一氧化碳的含量${}_3^{2-}$碳酸盐团簇随着CO ₂流量的增加而增加。薄膜的零电阻临界温度（T _{c 0}）表现出圆顶状的行为，因为CO的含量${}_3^{2-}$碳酸盐团簇增加。我们的观察不仅为存在一氧化碳提供了明确的证据${}_3^{2-}$ 薄膜中的碳酸盐团簇，但也证明了CO的含量${}_3^{2-}$ 碳酸盐团簇对薄膜的超导性能有很大影响。