We report a La2CuO4-like interlayer antiferromagnetic order in Sr2IrO4 films with large orthorhombic distortion (> 1.5%). The biaxial lattice strain epitaxial heterostructures of Sr2IrO4/Ca3Ru2O7 lowers the crystal symmetry from tetragonal (C4) to (C2), guiding Ir 5d Jeff = 1/2 pseudospin moment parallel elongated b-axis via magnetic anisotropy. From resonant X-ray scattering experiments, we ob...

Using high temperature expansions for the equal time correlator S(q) and static susceptibility χ(q) for the t-J model, we present evidence for quantum critical (QC), z=1, behavior at intermediate temperatures in a broad range of t/J ratio, doping, and temperatures. We find that the dynamical susceptibility is very close to the universal scaling function computable for the asymptotic QC regime, ...

This work expands the results and derivations presented in a recent letter. It is argued that symmetry breaking Hartree-Fock (HF) solutions of a simple model of the Cu-O planes in La2CuO4, are able to describe the insulator and antiferromagnetic characters of this material. Then, this classical primer of a Mott insulator is alternatively obtained here as an exact Slater insulator within the sim...

We calculate the antiferromagnetic spin wave dispersion in the half-filled (electronic density n = 1) Hubbard model for a two-dimensional square lattice, using the random phase approximation (RPA) in a broken symmetry (spin density wave) ground state. Our results for the spin wave dispersion, ω(q), are compared with high-resolution inelastic neutron scattering performed on La 2 CuO 4. The effec...

Filomena Forte,1,2 Luuk J. P. Ament,1 and Jeroen van den Brink1,3 1Institute-Lorentz for Theoretical Physics, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands 2Dipartimento di Fisica “E. R. Caianiello,” Università di Salerno, I-84081 Baronissi, Salerno, Italy and Laboratorio Regionale SuperMat, INFM-CNR, I-84081 Baronissi, Salerno, Italy 3Institute for Molecules and Materials...

the perovskite-structured la2cuo4 nanoparticles (lco nps) have been synthesized via an ultrasonic-assisted co-precipitation route using octanoic acidas organic surfactant, and the phase composition, morphology, lattice parameters and size of nanoparticles  are characterized through fourier transform infrared spectroscopy (ft-ir), x-ray diffraction (xrd), scanning electron microscopy (sem) and t...

To leading order in displacement size, the scattering of electrons in a Cu-O plane from O displacements perpendicular to that plane is due to spin-orbit coupling. This scattering is investigated with the following results: (1) As a consequence of timereversal symmetry, spin fluctuations, which can strongly enhance scattering from a spin impurity, do not enhance spin-orbit scattering; and (2) fo...

The lightly doped La2CuO4 of the high temperature superconducting Cu oxides shows spin glass behavior at very low temperatures, which reflects the effects of quantum fluctuations and frustration upon doping. Recent neutron scattering experiments revealed a formation of spin stripes at the same low concentration of doping. A specific relation between the two important properties of spin glass be...