Dominant recombination centers in Ga(In)NAs alloys: Ga interstitials

Dominant recombination centers in Ga(In)NAs alloys: Ga interstitials

p-type doping of GaInNAs quaternary alloys

a r t i c l e i n f o a b s t r a c t Using the first-principles band-structure method, we investigate the p-type doping properties and band structural parameters of the random Ga 1−x In x N 1− y As y quaternary alloys. We show that the Mg Ga substitution is a better choice than Zn Ga to realize the p-type doping because of the lower transition energy level and lower formation energy. The natur...

Invar effect in Pu-Ga alloys

We show that the anomalous thermal expansion behavior of Pu-Ga alloys can be explained by an invar effect, which is modeled by assuming the thermal transfer of Pu atoms from a lower-energy, higher-volume δ1 state to a higher-energy, lowervolume δ2 state. From a fit to the available neutron diffraction data on the lattice constants of Pu-Ga alloys, the energy separation of these states is found ...

Phonon softening in Ni-Mn-Ga alloys

The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to different martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. The branches show an anomaly (dip) at a wave number that depends on the particular martensitic structure, and there is softening of these anomalous phonons with d...

Magnetic domains in magnetostrictive Fe–Ga alloys

Lorentz microscopy was applied to the observation of magnetic domains in iron-gallium (Fe–Ga) alloys. Results did not show any link between the magnetic domains and the magnetostriction enhancement by Ga addition, but did reveal that the drastic decrease in magnetostriction for Fe–31.2 at. % Ga was due to the presence of large scale precipitates. Magnetic domain features did not change in the a...