Oxygen vacancies effect on phase separation in Pr0.5Ca0.2Sr0.3MnO3−δ

Effects of mobile vacancies on the dynamics of ordering and phase separation in nonconserved multicomponent systems.

Effect of oxygen vacancies on spin-dependent tunneling in Fe/MgO/Fe

Effect of oxygen vacancies on spin-dependent tunneling in Fe/MgO/Fe" (2007). Faculty Publications from Nebraska Center for Materials and Nanoscience. 21.

Effect of oxygen vacancies on interlayer exchange coupling in Fe/MgO/Fe tunnel junctions

We have investigated the interlayer exchange coupling (IEC) in Fe/MgO/Fe(0 0 1) tunnel junctions with and without oxygen vacancies in MgO, using model and density functional calculations. The model predicts that IEC changes sign from ferromagnetic to antiferromagnetic if a defect level matches the Fermi energy. Ab initio calculations show that for perfect junctions, IEC is ferromagnetic and dec...

Nonmagnetic insulator state in Na1CoO2 and phase separation of na vacancies.

Crystallographic, magnetic, and NMR properties of a Na1CoO2 single crystal with x approximately = 1 are presented. We identify the stoichiometric Na1CoO2 phase, which is shown to be a nonmagnetic insulator, as expected for homogeneous planes of Co3+ ions with S = 0. In addition, we present evidence that, because of slight average Na deficiency, chemical and electronic phase separation leads to ...

Interplay between Steps and Oxygen Vacancies on Curved TiO2(110).

A vicinal rutile TiO2(110) crystal with a smooth variation of atomic steps parallel to the [1-10] direction was analyzed locally with STM and ARPES. The step edge morphology changes across the samples, from [1-11] zigzag faceting to straight [1-10] steps. A step-bunching phase is attributed to an optimal (110) terrace width, where all bridge-bonded O atom vacancies (Obr vacs) vanish. The [1-10]...