Correlated electrons

Correlated electrons refer to electrons in a material that exhibit strong interactions with each other, leading to collective behavior that cannot be adequately described by treating them as independent particles. In systems of interacting electrons, the motions and states of individual electrons become dependent on one another, resulting in complex phenomena that are not captured by the simple principles of non-interacting particle physics.

122 iron arsenide refers to a specific class of iron-based superconductors, known for their layered structure and the presence of iron and arsenic in their composition. The "122" typically denotes the chemical formula of these compounds, which can be represented as \( AFe_2As_2 \), where \( A \) is a divalent alkaline earth metal or other element like barium (Ba) or strontium (Sr).

CeCoIn\(_5\) (cerium cobalt indium \(_5\)) is a material that belongs to a class of compounds known as heavy fermion systems. It is a intermetallic compound composed of the elements cerium (Ce), cobalt (Co), and indium (In).

Samarium hexaboride (SmB6) is a compound composed of samarium, a rare-earth element, and boron. It crystallizes in a complex cubic structure and is noted for its notable electronic properties. SmB6 is particularly interesting to researchers because it exhibits behavior characteristic of a topological insulator. In its bulk form, SmB6 is an insulator at low temperatures, but it has metallic-like surface states that can conduct electricity.

UPd₂Al₃ is a chemical compound composed of uranium (U), palladium (Pd), and aluminum (Al). It belongs to a class of materials known as intermetallic compounds, which are characterized by the orderly arrangement of two or more different metal atoms in a crystalline structure. In UPd₂Al₃, the composition indicates that there are one uranium atom, two palladium atoms, and three aluminum atoms in the formula.

Uranium, rhodium, and germanium are three distinct chemical elements, each with different properties and applications. 1. **Uranium (U)**: A heavy, silvery-white metallic element that is radioactive and has the atomic number 92. Uranium is primarily used as fuel in nuclear reactors and is a key material in the production of nuclear weapons. It occurs naturally in the Earth's crust and is mined in various parts of the world.

Uranium ruthenium silicide (often referred to as URuSi) is a compound that consists of uranium (U), ruthenium (Ru), and silicon (Si). It is of interest in the field of materials science and condensed matter physics due to its unique properties, which can include interesting electrical and magnetic behaviors.