High Tc superconducting materials for photonics: Normal state optical features study of Nd123 and Gd1212

In this work some optical properties of two different High Temperature Superconducting (HTSC) materials, in the normal state, are investigated: Nd123 (highest T_c YBCO-like superconductor) and Gd1212 (presenting Magnetic order and Superconductivity coexistance in the same cell below T_c). HTSC are very promising indeed for Photonics and Metamaterials fabrication mainly for their interesting properties in the THz range, due to the Superconducting (SC) Gap. In the normal State a PseudoGap can be observed of the same magnitude of the SC Gap. FTIR (Fourier Transform InfraRed spectroscopy) analysis have shown an unexpected very similar pseudogap for Nd123 and Gd1212 suggesting that more attention should be devoted to this last material. More investigation in the Nd123 and Gd1212 SuperConducting regime, as well as in the Gd1212 Magnetic Ordered-non SuperConducting one are needed to confirm these observations.