We consider the effect of the Ruderman-Kittel-Kasuya-Yosida~RKKY! interaction between magnetic impurities on the electron relaxation rates in a normal metal. The interplay between the RKKY interaction and the Kondo effect may result in a nonmonotonic temperature dependence of the electron momentum relaxation rate, which determines the Drude conductivity. The electron phase relaxation rate, whic...

We have prepared dilute nanostructured magnetic samples by codeposition of preformed cobalt clusters with a narrow size distribution around 40 atoms per cluster in silver matrices. Magnetoresistance measurements are used to derive information about the magnetic structure of the samples. Effects of cluster size distribution or anisotropy can be neglected in our samples. Deviations from simple La...

Electrical and magnetotransport measurements were performed on individual Co-doped ZnO dilute magnetic semiconductor nanowires. The electron transport studies show that the electron mobility could be as high as 75 cm(2)/(V.s), and we observed positive magnetoresistivity (MR) at low magnetic field and negative MR at higher magnetic field. s-d exchange-induced spin splitting of the conduction ban...

Atomic hydrogen diffuses in semiconductor lattices and binds to impurities by forming complexes that can lead to a full neutralization of the impurity effects. In the present paper, the structural, vibrational, electronic and magnetic properties of complexes formed by H in the MnxGa1−xAs (x=0.03) dilute magnetic semiconductor have been investigated by using first-principles DFT-LSD and LDA+U th...

We present first-principles density-functional calculations for the structural, electronic, and magnetic properties of substitutional 3d transition metal (TM) impurities in two-dimensional black and blue phosphorenes. We find that the magnetic properties of such substitutional impurities can be understood in terms of a simple model based on the Hund's rule. The TM-doped black phosphorenes with ...

Dilute YEr alloys show the existence of sinusoidaily modulated antiferromagnetism down to the lowest impurity concentrations studied. Extrapolation of the Ndel temperatures for both YEr and YTb suggests a critical concentration is 0.8 % Tb, Er. Ordering in such dilute alloys may result from exchange enhancement in the yttrium host. Following our earlier study of YTb alloys [I], we der contamina...

Dilute Magnetic semiconductors has been attracting researchers due to their wide range of applications like spintronics devices such as spin-FET, spin-LED, nanoscale integrated magnetic memories & sensors etc. But most of practical applications requires curie temperature for DMS to be around room temperature or more. Hence different studies had been done world-wide for controlling the electrica...