We propose that the extraordinarily high superconducting transition temperatures in the cuprates are driven by an exact mapping of the d(x(2)-y(2)) Cooper-pair wavefunction onto the incommensurate spin fluctuations observed in neutron-scattering experiments. This is manifested in the direct correspondence between the inverse of the incommensurability factor δ seen in inelastic neutron-scatterin...

Takada et al. have reported superconductivity in layered NaxCoO2.yH2O (Tc ≈ 5 K) and more recently Wen et al. in AxCoO2+δ (A = Na, K)(Tc ≈ 31 K). We model a reference neutral CoO2 layer as an orbitally non-degenerate spin1 2 antiferromagnetic Mott insulator on a triangular lattice and NaxCoO2.yH2O and AxCoO2+δ as electron doped Mott insulators described by a tJ model. It is suggested that at op...

High quality large Bi2(Sr2−xLax)CuO6+δ (La-Bi2201) single crystals have been successfully grown by the traveling solvent floating zone technique. The samples are characterized by compositional and structural analyzes and their physical properties are investigated by magnetic susceptibility and resistivity measurements. Superconducting samples with sharp superconducting transitions are obtained ...

The doping, temperature and energy dependence of the dynamical spin structure factors of the underdoped lanthanum cuprates in the normal state is studied within the t-J model using the fermion-spin transformation technique. Incommensurate peaks are found at [(1±δ)π, π], [π, (1±δ)π] at relatively low temperatures with δ linearly increasing with doping at the beginning and then saturating at high...

In this work, La1−xSrxNi0.4Fe0.6O3-δ (0 ≤ x 0.2) oxides were synthesized and employed as the identical electrode of direct methane symmetrical solid oxide fuel cell (SSOFC). addition, phase structure, redox stability, electrical conductivity, chemical compatibility, thermal expansion evaluated. The La2NiO4 occurs when amount doped Sr rises to 0.2. composition La0.9Sr0.1Ni0.4Fe0.6O3-δ (LSNF9146)...

This letter describes a method for forming Ru nanoclusters on oxide anode surfaces during the initial stages of solid oxide fuel cell operation, ielding improved anode performance without additional processing steps. Transmission electron microscope and X-ray photoelectron spectroscopy ◦ bservations showed that Ru nanoclusters precipitated onto La0.8Sr0.2Cr0.82Ru0.18O3−δ surfaces after exposure...

Developing highly active and stable catalysts based on earth-abundant elements for oxygen electrocatalysis is critical to enable efficient energy storage and conversion. In this work, we took advantage of the high intrinsic oxygen reduction reaction (ORR) activity of La(0.8)Sr(0.2)MnO(3-δ) (LSMO) and the high intrinsic oxygen evolution reaction (OER) activity of Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-...

Here, we report the structure evolution, magnetic and ferroelectric properties in Co-doped 4- and 3-layered intergrowth Aurivillius compounds Bi4NdTi3Fe1-xCoxO15-Bi3NdTi2Fe1-xCoxO12-δ. The compounds suffer a structure evolution from the parent 4-layered phase (Bi4NdTi3FeO15) to 3-layered phase (Bi3NdTi2CoO12-δ) with increasing cobalt doping level from 0 to 1. Meanwhile the remanent magnetizatio...

This article describes a new, simple, and high-yield method based on sonochemical process for obtaining the δ-KY3F10·xH2O compound with ‘super-diamond’ structure, material that has been completely neglected in literature since it was first discovered. We explore mechanism underlying formation of synthesized nanomaterials show their connection pH medium. Additionally, we demonstrate time adequac...