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Dive into the research topics where Elad N. Caspi is active.

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Featured researches published by Elad N. Caspi.


Journal of Applied Physics | 2005

Magnetic phase transition in YCo3B2 studied by magnetic resonance

O. Sigalov; A. I. Shames; Elad N. Caspi; Moshe Dubman; Hanania Ettedgui; S.D. Goren; H. Shaked

Magnetic-susceptibility measurements, nuclear magnetic resonance (NMR) of B11, and electron magnetic-resonance (EMR) spectra of YCo3B2 were measured as a function of the temperature. The temperature dependence of the magnetic susceptibility showed a lambda-shaped anomaly at 150K. Whereas upon cooling, a shift in the resonance position of the NMR and EMR spectra is observed at 150K, marking the emergence of an internal magnetic field. The quadrupolar splitting of the NMR lines showed a marked discontinuity at 150K. The (T1T)−1∕2 values were found to be independent of temperature for T>175K, and to increase sharply upon cooling for T 160K is also found to increase markly upon cooling below 150K. All these effects are discussed and it is proposed that YCo3B2 undergoes a magnetic ordering phase transition at 150K.


Journal of Alloys and Compounds | 1998

Pressure effect on the magnetic and crystallographic structures in the U(Ni1−xCux)2Ge2 system

Elad N. Caspi; H. Shaked; Haim Pinto; Mordechai Melamud; Zhongqiang Hu; O. Chmaissem; S. Short; J. D. Jorgensen

The pressure effect on the magnetic and crystallographic structures of the materials UCu 2 Ge 2 , and U(Ni 0.05 Cu 0.95 ) 2 Ge 2 are studied by neutron diffraction in the applied pressure range of ambient to 0.63 GPa, at room temperature and 60 K. The compressibilities of the materials are found to be isotropic, and very similar for both materials and temperatures. This isotropy is explained by a free-electron gas control of the compressibility. No pressure effect on the magnetic structures or on the magnitude of the magnetic moments was observed for both materials. This result is discussed in the framework of the RKKY model.


Physica B-condensed Matter | 1997

The (U1 − xLnx)Co2Ge2 systems: Parallel (LnNd) and antiparallel (LnTb) magnetic f-moments in the ordered state, determined by neutron diffraction

Moshe Kuznietz; Elad N. Caspi; Haim Pinto; Mordechai Melamud; H. Shaked

The relative orientation of magnetic moments of uranium (5f-atom) and a lanthanide (Ln, 4f-atom), occupying randomly the same site, was investigated by neutron diffraction in the ordered state of the systems (U1 − xLnx)Co2Ge2 with light (LnNd) and heavy (LnTb) lanthanide. These materials crystallize in the ThCr2Si2-type structure. Most of them order in the antiferromagnetic AF-I structure, with alternate (+ −) stacking of (U, Ln) planes having net moment, and f-moments along the tetragonal axis. It is found that the U and Nd moments in (U1 − xNdx)Co2Ge2 are parallel, while the U and Tb moments in (U1 − xTbx)Co2Ge2 are antiparallel. This is apparently due to in-plane direct exchange between f-atoms, in agreement with the “spin-charge” concept, considering that the U moments behave like light Ln.


Physica B-condensed Matter | 1997

The (Nd1−xTbx)Co2Ge2 system: Confirmation of the “spin-charge” concept by neutron diffraction

Elad N. Caspi; Moshe Kuznietz; Mordechai Melamud; Haim Pinto; H. Shaked

Abstract The relative orientation of magnetic 4f-moments of neodymium and terbium, randomly occupying the same site, was investigated by neutron diffraction in the ordered magnetic state of the solid solutions (Nd 1− x Tb x )Co 2 Ge 2 (ThCr 2 Si 2 -type crystal structure). The antiparallel magnetic ordering observed confirms the “spin-charge” concept for lanthanides.


Inorganic Chemistry | 2017

Evidence for Symmetry Reduction in Ti3(Al1−δCuδ)C2 MAX Phase Solid Solutions

Mustapha Nechiche; Thierry Cabioc’h; Elad N. Caspi; Oleg Rivin; Andreas Hoser; V. Gauthier-Brunet; Patrick Chartier; Sylvain Dubois

Ti3[Al1-δCuδ]C2 MAX phase solid solutions have been synthesized by sintering compacted Ti3AlC2-Cu composites produced by mechanical milling. Using X-ray and neutron diffraction techniques, it is demonstrated that the Cu mixing into the Al site is accompanied by lattice distortion, which leads to symmetry reduction from a hexagonal to a monoclinic structure. Such symmetry reduction likely results from this mixing through deviation of the A-site position from the special (0, 0, 1/4) position within the P63/mmc space group of the original Ti3AlC2 structure. Moreover, it is demonstrated that the Cu admixture into the A site can be adjusted from the composition of the reactant mixture. The lattice parameter variation of the solid solution compounds, with 10-50 atom % Cu in the A site, is found to be consistent with Vegards law.


Journal of Physics: Conference Series | 2010

Neutron diffraction study of Levantine Middle Bronze Age cast axes

Elad N. Caspi; Sariel Shalev; Sana Shilstein; Anna Paradowska; W. Kockelmann; Yossi Levy

A neutron diffraction study on 6 Middle Bronze Age axes, cast from tin bronze or from arsenical copper, has been carried out using the ENGIN-X beamline at ISIS. The gauge volumes dimensions were 4x4x10mm3; data were collected along the lengths of the objects in their central parts, as well as on the blades, in order to establish the spatial phase contents. Average phase fractions were determined by Rietveld analysis. The main phases identified were solid solutions, corrosion phases and metallic Pb inclusions. We have observed distributions of lattice constants of the solid solutions Cu-Sn, and Cu-As inside each gauge volume in the central parts of the axes due to segregation, or liquation effects. However, the Cu-Sn variations were significantly less pronounced in comparison with typical inhomogeneity effects in as cast objects. The results indicate that the studied Middle Bronze Age axes were probably treated at high temperatures for homogenization necessary for generating sufficient hardness, especially on the blades.


Physica B-condensed Matter | 2000

Phase separation and magnetic ordering studied by high-resolution neutron diffraction

Elad N. Caspi; Mordechai Melamud; Haim Pinto; H. Shaked; O. Chmaissem; J. D. Jorgensen; S. Short

Abstract High-resolution neutron diffraction study of the U 1− x Nd x Co 2 Ge 2 ( x =0.25) compound shows a separation into two phases, each order antiferromagnetically at a different temperature. The temperature dependence of the magnetic moment is deduced for both phases. The results are in agreement with previous low-resolution neutron diffraction measurements.


Physica B-condensed Matter | 1999

(ND1 -XTBX)CO2GE2 : A TENTATIVE MAGNETIC PHASE DIAGRAM

Elad N. Caspi; Haim Pinto; H. Shaked; Mordechai Melamud

Abstract Neutron diffraction, AC-susceptibility, and SQUID magnetization study of (Nd 1− x Tb x )Co 2 Ge 2 solid solutions is summarized in the form of a tentative magnetic phase diagram. The magnetic ordering of the (Nd 1− x Tb x )Co 2 Ge 2 system is compared to the (Nd 1− x U x )Co 2 Ge 2 system. The U effect on the magnetic structures is found to be more dominant than that of Tb on Nd.


Journal of Magnetism and Magnetic Materials | 1998

Ferrimagnetism in U(Co0.05Ni0.95)2Si2 and U(Ni0.95Cu0.05)2Si2

Moshe Kuznietz; Elad N. Caspi; Haim Pinto; Mordechai Melamud

Abstract A neutron-diffraction study of U(Co 1− y Ni y ) 2 Si 2 and U(Ni 1 − z Cu z ) 2 Si 2 solid solutions in the vicinity of UNi 2 Si 2 shows that the ferrimagnetic (+ + −) phase with k = (0, 0, 2/3) of the latter is observed also for materials with y = 0.95 and z = 0.05, below the AF-I phase with k = (0, 0, 1). This ferrimagnetism exists below 50 ± 4K in U(Co 0.05 Ni 0.95 ) 2 Si 2 , with U moment of 1.75 ± 0.11 μ B at 12 K, and coexists with an AF-I phase below 37 ± 5K in U(Ni 0.95 Cu 0.05 ) 2 Si 2 , with U moment of 1.79 ± 0.15 μ B at 12 K. The ferrimagnetic phase extends between y ≈ 0.93 and z ≈ 0.03. Its abrupt appearance upon a minor change in conduction-electron concentration is attributed to RKKY-like interactions.


Journal of Alloys and Compounds | 1998

Incommensurate and ferrimagnetic phases in U(Ni,M)2Si2 with minor M=Co or Cu

Moshe Kuznietz; Haim Pinto; Elad N. Caspi; Mordechai Melamud; G. André; F. Bourée

Abstract UNi 2 Si 2 orders magnetically at 124±1 K in an incommensurate (IC) phase, undergoes transition at 103±1 K to AF-I (+−+−) phase, and then another transition at 53±1 K to a ferrimagnetic (++−) phase. A.c.-susceptibility and neutron-diffraction studies of polycrystalline U(Ni,M) 2 Si 2 solid solutions, with minor M=Co and Cu (U(Co 1− y Ni y ) 2 Si 2 with y =0.75, 0.90, and 0.95, and U(Ni 1− z Cu z ) 2 Si 2 , with z =0.05, 0.10, and 0.25) confirm an IC phase for y =0.90 below 119±2 K down to 105±2 K and suggest (by a.c.-susceptibility only) IC phases below T N for compositions between y ≈0.85 and z ≈0.05. The above ferrimagnetic phase is observed at T ≤12 K also for compositions between y ≈0.93 and z ≈0.03. The magnetic phase diagram in the vicinity of UNi 2 Si 2 is redrawn and discussed.

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H. Shaked

Ben-Gurion University of the Negev

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Mordechai Melamud

Israel Atomic Energy Commission

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Haim Pinto

Ben-Gurion University of the Negev

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J. D. Jorgensen

Argonne National Laboratory

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Moshe Kuznietz

Argonne National Laboratory

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Moshe Dubman

Ben-Gurion University of the Negev

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S. Short

Argonne National Laboratory

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Oleg Rivin

Helmholtz-Zentrum Berlin

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Hanania Ettedgui

National Institute of Standards and Technology

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J. Mais

Northern Illinois University

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