The competition between nonmagnetic spin-Peierls (SP) and magnetic N\'eel ground states has been investigated in CuGe${\mathrm{O}}_{3}$ doped with Zn, Ni, Mn, Si. analysis of specific heat, ${C}_{p}$, data CuGe${\mathrm{O}}_{3}$, measured as a function field, supports SP transition at ${T}_{\mathrm{SP}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}14\phantom{\rule{0ex}{0ex}}\mathrm{K}$. replacement C${\mathrm{u}}^{2+}$ by Z${\mathrm{n}}^{2+}$, N${\mathrm{i}}^{2+}$, or...

Electronic structure calculations from first principles are employed to design half-metallic fully compensated ferrimagnets (or, as they widely known, antiferromagnets) susceptible of finding applications in spintronics. ${\mathrm{Cr}}_{2}\mathrm{Mn}Z$ $(Z=\mathrm{P},\mathrm{As},\mathrm{Sb},\mathrm{Bi})$ compounds have 24 valence electrons per unit cell and show that their total spin moment is approximately zero for a wide range lattice constants, agreement with the Slater-Pauling behavior...

Using a state-of-the-art full-potential electronic structure method within the local spin density approximation, we study and magnetic of Mn2V-based full Heusler alloys: Mn2VZ (Z = Al, Ga, In, Si, Ge Sn). We show that small expansion calculated theoretical equilibrium lattice constants restores half-metallic ferrimagnetism in these compounds. Moreover, degree disorder between V Z atoms, although it induces some states gap, preserves Slater–Pauling behaviour moments alloys keep high...

Half-metallic antiferromagnets are the ideal materials for spintronic applications since their zero magnetization leads to lower stray fields and thus tiny energy losses. Starting from ${\mathrm{Mn}}_{2}\mathrm{V}\mathrm{Al}$ ${\mathrm{Mn}}_{2}\mathrm{V}\mathrm{Si}$ alloys we substitute Co Fe Mn show by means of first-principles electronic structure calculations that resulting compounds ferrimagnets. When total number valence electrons reaches magic 24 Fe-doped semimetals nonmagnetic while...

Heusler alloys containing Co and Mn are amongst the most heavily studied half metallic ferromagnets for future applications in spintronics. Using state-of-the-art electronic structure calculations, we investigate effect of doping disorder on their magnetic properties. Small degrees by substituting Fe or Cr scarcely affect metallicity. A similar is also achieved mixing sublattices occupied sp atoms. Thus metallicity a robust property these alloys.

We complement our study on the doping and disorder in Co$_2$MnZ compounds [I. Galanakis \textit{et al.}, Appl. Phys. Lett. \textbf{89}, 042502 (2006) K. \"Ozdo\~gan Rev. B \textbf{74}, (2006)] to cover also quaterarny Co$_2$[Y$_{1-x}$Y$^*_x$]Z with lower-valent transition metals Y,Y$^*$ being Cr, Mn or Fe sp atom Z one of Al, Ga, Si, Ge, Sn. This gives a global overview magnetic electronic properties these since we vary both Y elements. Our results suggest that for realistic applications...

We expand our study of the full-Heusler compounds [I. Galanakis et al., Appl. Phys. Lett. 89, 042502 (2006)] to cover also case doping and disorder in ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ half-metallic Heusler alloys. These alloys present a region very small minority density states instead real gap. Electronic structure calculations reveal that with Fe Cr retains half-metallicity contrary compound. impurities an unusual behavior, spin moment...

This study investigates the relationship between high-performance work systems (HPWS) and innovation behavior (IB) using structural equation modeling. The research was carried out on a sample of 205 managers employees at diverse hospitals located in Istanbul. normal distribution conformity quantitative variables assessed by examining skewness values against threshold points kurtosis values. independent t-test also used to compare two normally distributed groups, while one-way Anova test...

Bu araştırma, yöneticilerin vizyoner liderlik davranışlarının, çalışanların örgütsel muhalefet davranışları üzerindeki etkisi ve bu iki değişken arasındaki ilişkide, demokrasi algısının düzenleyici rolünü ortaya koymaya çalışmıştır. Araştırma, imalat sektöründe faaliyet gösteren 309 şirket yöneticisi çalışandan toplanan anketler üzerinden gerçekleştirilmiştir. Elde edilen veriler ölçeklerin faktör analizleri yapılmış, değişkenler arası korelasyon incelenmiş regresyon ile hipotezler test...

High quality compact Ni nanowire (NW) arrays with aspect ratios (wire length/diameter) varying between 70–171 for a wire length of ∼6 μm, and 3–400 constant diameter 60 nm were successfully grown by direct current electrodeposition into free standing porous alumina templates having lattice constant, i.e., interpore distance, 105 nm. The NWs have been investigated using combination scanning- transmission-electron microscopies, selected-area electron diffraction, x-ray diffraction analysis,...

The anomalous Hall effect in ultra-thin {Co0.3 nm/Pd0.5 nm}n multilayers has been investigated recently with respect to surface and interface contributions [Guo et al., Phys. Rev. B 86, 104433 (2012)]. In this work, we observe a Co thickness temperature dependent sign change also for {Co0.20–0.55 nm/Pd1.5nm or 1.8 nm}9x multilayers, e.g., layer stacks considerably thicker Pd layers hence lower resistivity. behavior can be reproduced by ab initio calculations of the conductivity, which only...

Magnetic anisotropies of epitaxial ultrathin iron films grown on the surface-reconstructed GaAs substrate were studied. Ferromagnetic resonance technique was exploited to determine magnetic parameters in temperature range 4–300K. Extraordinary angular dependence FMR spectra explained by presence fourfold and twofold in-plane anisotropies. A strong uniaxial anisotropy with hard axis along [11¯0] crystallographic direction is present at GaAs∕Fe(001) interface while a weak for Fe Au has its...

Magnetic properties of ultrathin Py/Cr/Py trilayers have been investigated as a function Cr spacer layer thickness by using ferromagnetic resonance (FMR) and vibrating sample magnetometer (VSM) techniques. The was increased from 4 to 40 Å with 1 steps determine the dependence interlayer exchange coupling between layers on thickness. Two strong well resolved peaks were observed which correspond (acoustic) weak (optic) modes magnetization precession in effective dc field due exciting external...

Measurements of electron paramagnetic resonance (EPR) at 9 and 35 GHz between 2 300 K in single crystals powder samples CuGeO3 are presented. Below 14 a large decrease the intensity Cu2+ EPR signal is observed. The data can be interpreted as due to spin-Peierls transition. However, an alternative interpretation terms simple structural transition cannot ruled out. An opening energy gap ∼25 calculated from analysis.