Which material had the highest known transition temperature before high-temperature superconductors were discovered?

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Figure 1: Specific heat in the normal (Cen) and superconducting (Ces) states of a classic superconductor as a function of absolute temperature. The two functions are identical at the transition temperature (Tc) and above Tc. — superconductivity Figure 1: Specific heat in the normal (C_en) and superconducting (C_es) states of a classic superconductor as a function of absolute temperature. The two functions are identical at the transition temperature (T_c) and above T_c.

Before the discovery of high-temperature superconductors in 1986, the material with the highest known transition temperature was a compound of niobium and germanium, known as ${Nb}_{3} Ge$ . This metallic alloy exhibited a transition temperature of 23 K.1