The results of low-temperature, ultrahigh-resolution ultraviolet photoemission studies the electronic structure stable icosahedral ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$, ${\mathrm{Al}}_{64}$${\mathrm{Cu}}_{24}$${\mathrm{Fe}}_{12}$, ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Ru}}_{15}$, ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Ru}}_{7.5}$${\mathrm{Fe}}_{7.5}$, ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Os}}_{15}$,...

Various magnetic properties of a novel, thermodynamically stable, icosahedral alloy ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$, have been studied at low temperatures with $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy and ac susceptibility. It is found that Fe atoms bear no moment down to 1.5 K. The presence multiplicity sites in this demonstrated. argued reflects the intrinsic disorder system. analysis spectra alloys used literature terms two doublets or singlets unphysically...

The results of a systematic ultrahigh resolution ultraviolet photoemission study the electronic structure stable icosahedral alloys ${\mathrm{Al}}_{64}$${\mathrm{Cu}}_{24}$${\mathrm{Fe}}_{12}$, ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$, ${\mathrm{Al}}_{70}$${\mathrm{Pd}}_{20}$${\mathrm{Mn}}_{10}$, and ${\mathrm{Al}}_{70.5}$${\mathrm{Pd}}_{21}$${\mathrm{Re}}_{8.5}$ are presented. It is shown that all have clearly developed Fermi edge thus metallic down to temperature...

A novel icosahedral alloy, ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$, produced in both a thermodynamically metastable and stable phase, has been studied with $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy, x-ray diffraction, differential thermal analysis. It was found that the spectrum of either phase can be successfully analyzed terms distribution quadrupole-splitting magnitudes. This is interpreted as evidence for continuous iron sites. The similarities parameters phases...

Magnetic properties of melt-spun Co80Zr20−xBx microcrystalline alloys (0≤x≤8) depend crucially on the quench rate.The optimized values Hc =2.68 kOe and (BH)max =2.10 MG Oe were obtained for Co80Zr16B4 with substrate surface velocity 48 m/s. A new crystalline phase Co5Zr was observed.

The results of x-ray diffraction and $^{57}\mathrm{Fe}$ $^{151}\mathrm{Eu}$ M\"ossbauer spectroscopy measurements, supplemented with ab initio hyperfine-interaction parameter calculations, on the new 35.5 K superconductor ${\mathrm{Rb}}_{1\ensuremath{-}\ensuremath{\delta}}{\mathrm{EuFe}}_{4}{\mathrm{As}}_{4}$ are presented. crystallizes in tetragonal space group $P4/mmm$ lattice parameters $a=3.8849(1)$ \AA{} $c=13.3370(3)$ \AA{}. It is shown that there no magnetic order Fe moments down to...

Photoemission spectroscopy measurements in the photon-energy range 35--150 eV have been used to determine valence band of stable icosahedral alloy ${\mathrm{Al}}_{70}$${\mathrm{Pd}}_{20}$${\mathrm{Mn}}_{10}$. Resonant photoemission near Mn 3p\ensuremath{\rightarrow}3d transition has employed show that feature at about 1.0 below Fermi level is predominantly due 3d-derived states. The effect Cooper minimum identify 3.6 as being mainly states Pd 4d character. strong decrease intensity towards...

X-ray diffraction, thermal analysis, transmission electron microscopy, bulk magnetisation and 57Fe Mossbauer effect measurements have been used to study the structure stability of rapidly quenched Al100-xFex alloys for 2<or=x<or=22. Alloys with 2<or=x<or=4 show a supersaturated solution Fe in FCC Al. x>or=4 phase quasicrystalline phase. The stoichiometry this latter is found be close Al4Fe. results indicate an environment lower symmetry closer Al neighbours than crystalline Al6Fe.

${\mathrm{Al}}_{52.5}$${\mathrm{Ge}}_{22.5}$${\mathrm{Mn}}_{25}$, ${\mathrm{Al}}_{52.5}$${\mathrm{Ge}}_{22.5}$${\mathrm{Mn}}_{24.85}$${\mathrm{Fe}}_{0.15}$, ${\mathrm{Al}}_{40}$${\mathrm{Cu}}_{10}$${\mathrm{Ge}}_{25}$${\mathrm{Mn}}_{25}$, and ${\mathrm{Al}}_{40}$${\mathrm{Cu}}_{9.94}$${\mathrm{Fe}}_{0.06}$${\mathrm{Ge}}_{25}$${\mathrm{Mn}}_{25}$ icosahedral alloys AlGeMn ${\mathrm{AlGeMn}}_{0.995}$${\mathrm{Fe}}_{0.005}$ crystalline have been studied with x-ray diffraction, differential...

The ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Ru}}_{15}$ icosahedral alloy was studied by $^{27}\mathrm{Al}$ nuclear magnetic resonance from 150 to 1110 K. Knight shift of the unresolved line observed significantly increase above 500 This uncommon temperature dependence is interpreted in terms presence a pseudogap at Fermi level. spin-lattice relaxation rate deviates linear Korringa below K, and K it dominated thermally activated process with small activation energy 0.48 eV....

The results of the low-temperature ultrahigh-energy-resolution photoemission studies a single-grain icosahedral alloy ${\mathrm{Al}}_{70}{\mathrm{Pd}}_{21.5}{\mathrm{Mn}}_{8.5}$ have been presented. existence theoretically predicted pseudogap in density states at Fermi energy has confirmed. No evidence spikiness could be observed. It suggested that failure to detect quasicrystals is consistent with Zijlstra and Janssen [Europhys. Lett. 52, 578 (2000)] who showed occurs only lower-order...

$^{61}\mathrm{Ni}$ M\"ossbauer measurements have been performed at 4.2 K on spherical Ni particles covered with a protective layer of SiO, average diameter 500 and 50 \AA{}. The hyperfine magnetic field nuclei for 500-\AA{} has found to be 78.3(4) kOe, compared the foil 75.0(2) kOe. small difference is due demagnetization dipolar fields in particles. spectrum 50-\AA{} surface component corresponding value 40.3(5.4) This strongly indicates that, accordance recent theoretical studies, there...

The crystal and magnetic properties of nickel ferrite-aluminates are investigated with X-ray, neutron diffraction, magnetometric, Mössbauer effect methods. Variation the saturation moment per molecule measured at 78 K chemical composition is satisfactorily explained on basis collinear spin ordering model elaborated experimentally verified cation distributions model. Es werden die Kristalleigenschaften und magnetischen Eigenschaften von Aluminium-Nickel-Ferriten mit Hilfe...

The results of a $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy study between 2.0 and 294 K superconducting Ba(Fe${}_{0.961}$Rh${}_{0.039}$)${}_{2}$As${}_{2}$ are reported. main component the electric field gradient tensor at is shown to be positive its increase with decreasing temperature well described by ${T}^{3/2}$ power-law relation. shape spectra below N\'eel ${T}_{N}=55.5(1)$ result from presence doping-induced disorder rather than incommensurate spin-density-wave order. measured...

The results of x-ray diffraction, electrical resistivity, magnetic susceptibility, and (57)Fe (155)Gd Mössbauer spectroscopy studies polycrystalline samples nonsuperconducting GdFeAsO superconducting Gd(0.84)Th(0.16)FeAsO are reported. superconductor has the onset transition temperature 54.4(1) K. We find that Fe Gd moments in order antiferromagnetically at 132.7(1) K 4.1(1) K, respectively. In Gd(0.84)Th(0.16)FeAsO, atoms carry no moment down to 1.9 whereas below 2.9(1) This is taken as...

Photoemission spectroscopy measurements in the photon-energy range 35--120 eV have been used to make determinations of valence bands high-quality decagonal alloys ${\mathrm{Al}}_{65}$${\mathrm{Co}}_{15}$${\mathrm{Cu}}_{20}$ and ${\mathrm{Al}}_{70}$${\mathrm{Co}}_{15}$${\mathrm{Ni}}_{15}$. Resonance photoemission near Co 3p\ensuremath{\rightarrow}3d transition has employed show that feature both with a maximum intensity at 0.7(2) below Fermi level is predominantly 3p character. The 3.7(1)...