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THERMAL PROPERTIES OF MATTER

Thermal Expansion

Thermal Conductivity

Resistivity vs. Temperature for a Superconductor

The transition to zero resistivity at a finite temperature in a high transition temperature superconductor can be demonstrated using this sample of Yttrium-Barium-Copper-Oxide, which has a four point probe for measuring current and voltage. At room temperature the resistance of the probe is several milliohms. When the sample is immersed in liquid nitrogen, the current remains constant at several hundred milliamps while the probe voltage gradually decreases and then abruptly drops to zero at the critical temperature. A thermocouple allows for measuring the temperature of the sample.

Resistivity vs. Temperature for a Superconductor