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Who discovered superconductivity in 1911?

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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.

Superconductivity was discovered in 1911 by the Dutch physicist Heike Kamerlingh Onnes.12

Kamerlingh Onnes observed that the electrical resistivity of a mercury wire vanished abruptly when cooled below approximately 4 K (−269 °C). For this pioneering low-temperature research, he was awarded the Nobel Prize for Physics in 1913.12