Superconductivity develops in metals upon the formation of a coherent macroscopic
quantum state of electron pairs. Iron pnictides and chalcogenides are materials that have …

The response of the worldwide scientific community to the discovery in 2008 of
superconductivity at T c= 26 K in the Fe-based compound LaFeAsO1− x F x has been very …

The iron-based superconductors that contain FeAs layers as the fundamental building block
in the crystal structures have been rationalized in the past using ideas based on the Fermi …

Abstract (Tl, K) Fe x Se 2 single crystals were first successfully synthesized with the
Bridgeman method. The physical properties are characterized by electrical resistivity …

Strongly correlated materials are profoundly affected by the repulsive electron‐electron
interaction. This stands in contrast to many commonly used materials such as silicon and …

We study a multiorbital model for the alkaline iron selenides K 1-x Fe 2-y Se 2 using a slave-
spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator …

The insulator-metal transition in Mott insulators, known as the Mott transition, is usually
accompanied with various novel quantum phenomena, such as unconventional …

Unconventional superconductivity in bulk materials under ambient pressure is extremely
rare among the 3d transition metal compounds outside the layered cuprates and iron-based …

AU (1) slave-spin representation is introduced for multiorbital Hubbard models. As with the Z
2 form of de'Medici et al.[Phys. Rev. B 72, 205124 (2005) PRBMDO 1098-0121 …

Quantum phase transitions in metals are often accompanied by violations of Fermi liquid
behavior in the quantum critical regime. Particularly fascinating are transitions beyond the …