Physicists studying exotic matter recently stumbled upon an important quantum phenomenon called “Payins demon”, predicted by the deceased physicist David Pines in the far of 1956. Its discovery in the material called Rutenat Strontia (SR2RO4) was the first case of the identification of this effect in an equilibrium 3D metal.
67 years ago, Pines predicted that electrons located in solid bodies can acquire remarkable characteristics. Despite the fact that electrons typically possess both mass and electric charge, Pines suggested that they can be combined into a composite particle devoid of mass, electrically neutral, and non-consuming to interact with light.
The researcher named this potentially possible massless neutral particle. In scientific circles, it is believed that “demons” play an extremely important role in the behavior of various metals. However, the same properties that make such particles so interesting also make it challenging to observe them, as they hardly interact with the environment.
In fact, the “demon of Pines” is a plasmon frequency that does not require an electric charge. It arises when electrons in the material, having different energy ranges or stripes, move in antiphase. Energy transmission does not occur, but the occupation of the zones changes.
Plasmons were previously observed and extensively studied in 2D metals, but due to their electrical neutrality and lack of interaction with light, they are difficult to detect. That’s where Rutenat Strontia comes in. At low temperatures, it behaves as a superconductor, and at higher temperatures, it turns into what is commonly referred to as a “bad metal,” whose properties do not necessarily align with expectations.
According to a group of physicists who made this discovery, Rutenat Strontia is an excellent candidate for future identification of “demons”. These demons can play a crucial role in superconductivity, consequently, further study of this element and its properties will continue.
Researchers believe that many other multi-zone metals may exhibit similar properties and can also become suitable candidates for study. Additionally, scientists hope that such research will eventually answer numerous questions regarding exotic matter and the nature of “demons”. This advancement in knowledge could greatly contribute to research in the field of superconductivity.