What superconductor material works with the highest temperature?

As of 2020 the material with the highest accepted superconducting temperature is an extremely pressurized carbonaceous sulfur hydride with a critical transition temperature of +15°C at 267 GPa.

Why are high-temperature superconductors exciting?

That’s why superconductors are so exciting: They are 100 percent efficient because current zooms through them with zero energy loss: The pinball machine turns into a super highway! This is great for the electric bill, one reason (but not the main reason … more on that in a minute!)

How did high-temperature superconductivity start?

It started with a simple class of materials: copper oxides. In the mid-1980s, experiments with copper oxides with the elements lanthanum and barium broke the longstanding temperature record by several degrees, being found to superconduct at temperatures greater than 30 K.

What is a high temperature superconductor?

High-temperature superconductors (abbreviated high-Tc or HTS) are operatively defined as materials that behave as superconductors at temperatures above 77 K (−196.2 °C; −321.1 °F), the boiling point of liquid nitrogen, one of the simplest coolants in cryogenics.

How does a high-Tc superconductor work?

In a high- Tc superconductor, the mechanism is extremely similar to a conventional superconductor, except, in this case, phonons virtually play no role and their role is replaced by spin-density waves.

Why do superconductors need cooling?

All materials currently known to conduct at ordinary pressures become superconducting at temperatures far below ambient, and therefore require cooling. The majority of high-temperature superconductors are ceramic materials.

How to increase the superconductive transition temperature of a material?

The superconductive transition temperature can be maximized by varying the dopant concentration. The simplest example is La 2 CuO 4, which consist of alternating CuO 2 and LaO layers which are insulating when pure. When 8% of the La is replaced by Sr, the latter act as dopants, contributing holes to the CuO 2 layers, and making the sample metallic.