2018/03/02 by J. Gunasekera, Jagath Gunasekera, A. Dahal +17
Physics and Astronomy · #Advanced Condensed Matter Physics #Anderson localization #Excitation #Gapless playback #Lattice (music) #Physics of Superconductivity and Magnetism #Quantum #Quantum spin liquid #Spins #State of matter #Topological Materials and Phenomena #Valence (chemistry) #cond-mat.str-el
paper · pdf · doi:10.1002/advs.201700978
published as Advanced Science 2018, 1700978 · 8 pages, 6 figures
openalex publication_date 2018/03/02 · arxiv created 2018/03/20 · arxiv updated 2018/03/21 · openalex created_date 2018/03/29 · openalex updated_date 2026/08/05
Abstract Quantum magnetic properties in a geometrically frustrated lattice of spin‐1/2 magnet, such as quantum spin liquid or solid and the associated spin fractionalization, are considered key in developing a new phase of matter. The feasibility of observing the quantum magnetic properties, usually found in geometrically frustrated lattice of spin‐1/2 magnet, in a perovskite material with controlled disorder is demonstrated. It is found that the controlled chemical disorder, due to the chemical substitution of Ru ions by Co‐ions, in a simple perovskite CaRuO 3 creates a random prototype configuration of artificial spin‐1/2 that forms dimer pairs between the nearest and further away ions. The localization of the Co impurity in the Ru matrix is analyzed using the Anderson localization formulation. The dimers of artificial spin‐1/2, due to the localization of Co impurities, exhibit singlet‐to‐triplet excitation at low temperature without any ordered spin correlation. The localized gapped excitation evolves into a gapless quasi‐continuum as dimer pairs break and create freely fluctuating fractionalized spins at high temperature. Together, these properties hint at a new quantum magnetic state with strong resemblance to the resonance valence bond system.