ﻻ يوجد ملخص باللغة العربية
We investigate the effect of Ni${text -}$substitution on the crystalline structure and the critical behavior of $Nd_{0.6}Sr_{0.4}Mn_{1-x}Ni_{x}O_{3}$ (0.00 $leq$ x $leq$ 0.20) perovskite. X${text -}$ray diffraction patterns revealed that the major phase in all samples is the orthorhombic structure with space group $textit{Pnma}$. Rietveld refinement revealed a linear reduction in the lattice parameters along with monotonic reduction in the O2${text -}$Mn${text -}$O2 angel with increasing Ni concentration. The modified Arrott plots and the Kouvel${text -}$Fisher method have been used to analyze the magnetization isotherms near the paramagnetic to ferromagnetic (PM${text -}$FM) phase transition. The obtained critical exponents ($beta$, $gamma$ and $delta$) revealed that the Ni${text -}$free sample is consistent with 3D${text -}$Heisenberg like behavior. However, upon Ni${text -}$substitution, the critical exponents exhibit a mean field like behavior. The reliability of the obtained critical exponent ($beta$, $gamma$ and $delta$) values have been confirmed by the universal scaling behavior of the isothermal magnetization near the transition temperature.
In this work, we investigate the effect of Ni concentration on several shielding properties of $Nd_{0.6}Sr_{0.4}Mn_{1-y}Ni_{y}O_{3}$ (0.00 $leq$ y $leq$ 0.20) perovskite ceramic for possible use as radiation shielding materials. X-ray diffraction (XR
We present the electronic structure of Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3} investigated by high-resolution photoemission spectroscopy. In the vicinity of Fermi level, it was found that the electronic structure were composed of a Cr 3d local state
By using laboratory x-ray photoemission spectroscopy (XPS) and hard x-ray photoemission spectroscopy (HX-PES) at a synchrotron facility, we report an empirical semi-quantitative relationship between the valence/core-level x-ray photoemission spectral
We report the new results of exchange bias effect in Nd_{1-x}Sr_{x}CoO_3 for x = 0.20 and 0.40, where the exchange bias phenomenon is involved with the ferrimagnetic (FI) state in a spontaneously phase separated system. The zero-field cooled magnetiz
We report the characterization of the crystal structure, low-temperature charge and orbital ordering, transport, and magnetization of Pr_{0.6}Ca_{0.4}MnO_{3} films grown on LaAlO_{3}, NdGaO_{3}, and SrTiO_{3} substrates, which provide compressive (La