Influence of Substrate Temperature and Dopant Distribution at Two-Dimensionally Doped Superconducting La2CuO4 Interfaces

Atomic-Scale Quantitative Analysis of Lattice Distortions at Interfaces of Two-Dimensionally Sr-Doped La2CuO4 Superlattices

Using spherical aberration corrected high-resolution and analytical scanning transmission electron microscopy, we have quantitatively studied the lattice distortion and the redistribution of charges in two-dimensionally strontium (Sr)-doped La2CuO4 superlattices, in which single LaO planes are periodically replaced by SrO planes. As shown previously, such structures show Tc up to 35 K as a cons...

Spin glass state in doped La2CuO4

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...

Andreev reflections at interfaces between delta-doped GaAs and superconducting Al films

Calculation of dopant segregation ratios at semiconductor interfaces

We analyzed dopant segregation at semiconductor interfaces by equilibrating chemical potentials of dopants and electrons on each side of the interface. We apply the theory to Si/strained-SiGe interfaces and compare the predictions with existing experimental data. The calculations include changes in effective density of states with particular attention to high-temperature hole effective mass , b...

Oxygen interstitials in superconducting La2CuO4: their valence state and role.

The nature of the much debated valence state of an interstitial oxygen atom in oxygen-doped La2CuO4 is the subject of this paper. In model cluster calculations, we studied the position, charge, and spin state of the interstitial oxygen atoms in this superconductor. The models considered allow the interstitial oxygen to move off a symmetrical position, to have varying spin and charge, and to be ...