Journal ArticleDOI
Antiferromangetic spin correlations in insulating, metallic, and superconducting La2-xSrx
Robert J. Birgeneau,D. R. Gabbe,Hans P. Jenssen,Marc Kastner,P. J. Picone,T. R. Thurston,Gen Shirane,Y. Endoh,M. Sato,K. Yamada,Yoshikazu Hidaka,Migaku Oda,Youichi Enomoto,Motofumi Suzuki,Toshiaki Murakami +14 more
TLDR
It is shown that the Neel state is destroyed by the doping and spin-spin correlation lenght xi is quite short, varying from approx.35 to approx.8 A as x varies between 0.02 and 0.18; the local order is the same as in pure La/sub 2/CuO/sub 4/.Abstract:
We have carried out elastic, quasielastic (..integral.. dE), and inelastic neutron-scattering studies of the antiferromagnetic spin correlations in La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ with x varying between 0.02 and 0.18. The crystals, which were grown in three different laboratories, exhibit behavior that varies smoothly with x. In all cases, antiferromagnetic correlations with a scattering amplitude corresponding to a fully occupied Cu/sup 2+/ square lattice are observed. However, the Neel state is destroyed by the doping and spin-spin correlation lenght xi is quite short, varying from approx.35 to approx.8 A as x varies between 0.02 and 0.18; the local order is, however, the same as in pure La/sub 2/CuO/sub 4/. The fluctuations are dynamic in character as in La/sub 2/CuO/sub 4/ above the Neel temperature T/sub N/. To a first approximation, xi = 3.8/ ..sqrt..x A, the average separation between the holes introduced by the Sr/sup 2+/ doping. The x = 0.08 sample exhibits superconductivity with T/sub c/ = 10 K and with a Meissner fraction exceeding 15% at 5 K; no important differences in the magnetic scattering are observed in the normal and superconducting states. In an appendix we present additional data on the spin dynamics in pure La/sub 2/CuO/submore » 4/ at T = 300 K in a sample with T/sub N/ = 235 K.« lessread more
Citations
More filters
Journal ArticleDOI
Electronic structure of the high-temperature oxide superconductors
TL;DR: In this paper, a review of the results of the density-functional type of electronic structure calculations is presented, and their results are compared with the relevant experimental data, showing that the important electronic states are dominated by the copper and oxygen orbitals, with strong hybridization between them.
Journal ArticleDOI
Resonant X-Ray Scattering Studies of Charge Order in Cuprates
Riccardo Comin,Andrea Damascelli +1 more
TL;DR: In this article, the authors review the recent resonant X-ray scattering breakthroughs in the copper oxide high-temperature superconductors, in particular regarding the phenomenon of charge order, a broken-symmetry state occurring when valence electrons self-organize into periodic structures.
Journal ArticleDOI
Magnetism in La2CuO4 based compounds
TL;DR: In this paper, an analytical solution of spin density wave with infinite higher harmonics is obtained, giving rise to a soliton lattice spin structure, striped charge domain walls which run perpendicular to the modulation vector Q and associated midgap state.
Journal ArticleDOI
Theory of superconductivity in strongly correlated electron systems
TL;DR: In this article, the fundamental natures of superconductivity in strongly correlated electron systems (SCES) from a universal point of view are discussed. But, the authors focus on the superconducting properties of the SCES near the Mott transition.
Journal ArticleDOI
Crystal chemistry and superconductivity of the copper oxides
TL;DR: In this article, the authors highlight the important roles played by crystal chemistry in controlling the superconductive properties of the intergrowth structures of the copper oxides and show that the coordination geometry preferred by different oxidation states of Cu appears to control the oxygen ordering and the Tc variation in the YBa2Cu3O6+x system.