What are the materials with transition temperature between 20K and 40K
Some superconductors have a transition temperature between 20 degrees Kelvin and 40 degrees Kelvin:

* High-temperature superconductors (HTS): HTS materials such as YBa2Cu3O7-x (YBCO), Bi2Sr2CaCu2O8+x (BSCCO), and Tl2Ba2Ca2Cu3O10+x (Tl-1223) have transition temperatures between 20K and 40K.
* Iron-based superconductors: Iron-based superconductors such as Sodium iron arsenide (NaFeAs) which has a transition temperature of 20 K. LaFeAs(O,F) and Ba(Fe1-xTx)2As2 (where T = Co, Ni) have transition temperatures between 20K and 40K.
* Ruthenates: Ruthenates such as Sr2RuO4 have a transition temperature of around 1.5 K, but their doped counterparts, such as Sr3Ru2O7 and SrRuO3, have transition temperatures in the range of 20K to 40K.
* Magnesium diboride (MgB2): MgB2 is a relatively new superconductor with a transition temperature of around 39K.
* Vanadium dioxide (VO2): VO2 undergoes a metal-insulator transition around 68°C (341K), but doped VO2 can exhibit a transition temperature in the range of 20K to 40K.
* Cesium fulleride (Cs3C60), a type of organic superconductor that has a transition temperature of 38 K.
* Rubidium-doped carbon-60 (C60RbX), a similar organic superconductor that has a transition temperature of 28 K.
* Potassium-doped carbon-60 (C60K3) comes very close, with a transition temperature of 19.8 K.
Could you explain what each of those substances are like I'm 5 years old, and why super conductors matter?