Spin excitations in K0.84Fe1.99Se2 superconductor as studied by M\"ossbauer spectroscopy
Abstract
M\"ossbauer spectroscopy was used to probe the site specific information of the K0.84Fe1.99Se2 superconductor. Possibility of coexistence of superconductivity and magnetism is discussed. A spin excitation gap, E ≈5\,meV, is observed by analyzing the temperature dependence of the hyperfine magnetic field (HMF) at the iron site within the spin wave theory. Using a simple model suggested in the literature, the temperature dependence of the HMF is well reproduced, suggesting that, below room temperature, the iron-selenide superconductors can be regarded as ferromagnetically coupled spin blocks that interact with each other antiferromagnetically to form the observed checkerboard-like magnetic structure.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.