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Recently it came in the news that scientists have discovered a new state of matter called Jahn-Teller metal. I tried reading up on it but couldn't understand it clearly.

Please explain in simple terms why this is a new state of matter and/or what's so special about it.

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The Jahn-Teller metal is not one of the 3 (or 4 including plasma) states that occur naturally on Earth; this state allows a metal to have the properties of an insulator and a superconductor.

An electronic phase diagram illustrating the crossover between the Jahn-Teller metal to conventional metals.

It is an intermediate state of matter confirming the Jahn-Teller distortion; by interacting with certain electrons (a more detailed description can be found in this Science Advances magazine article, a distorted crystalline structure allows a solid depicting characteristics of an insulator to also becomes a conductor.

The main breakthrough this brings is having a superconductors. Superconductors are extremely useful because they possess zero resistance, except the conditions require them to be cooled to extreme temperatures. This state nonetheless suggests reproducing superconductors at a less extreme temperature.

Making it an economic way to make efficient electronics.

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