Structural and Magnetic Properties of Yb0.5Ce0.5Ni5

The rare-earth magnetism in the intermetallic compound Yb0.5Ce0.5Ni5 was studied using X-ray diffraction, magnetization, heat capacity, and electrical resistivity measurements. The effect of spin fluctuations (SF) was observed in M(T) at ~40 K. The measurement of thermal and transport properties supported the results obtained from magnetic measurements. Collected experimental data showed that Yb/Ce substitution shifts the maximum temperature for spin fluctuations to a lower temperature compared to that for pure CeNi5. Moreover, at low temperatures, an anomaly in the heat capacity of possible magnetic origin arising from Yb3+ was detected. Ce atoms seemed to remain in a non-magnetic valence state at almost 4+.This research was funded by the Slovak Grant Agency VEGA 1/0404/21 (Materials with emergent behaviour and application possibilities under extreme physical conditions influence); VEGA 1/0705/20 (Novel rare earth based intermetallic compounds - crystal structure and physical properties of their ground state); VEGA 1/0053/19 (Influence of chemical composition on unique physical properties of modern functional materials) and APVV-16-0079 (Modern amorphous and polycrystalline functional materials for sensors and actuators

Experimental study of emergent ground state behavior in Gd1-xCexNi5 (x = 0; 0.2; 0.5; 0.8 and 1) melt-spun ribbons

The ground state physical properties of Gd1-xCexNi5 (x = 0; 0.2; 0.5; 0.8 and 1) melt-spun ribbons were investigated by X-ray diffraction, magnetization and specific heat measurements. The produced ribbon samples are single phases with the hexagonal CaCu5-type crystal structure. The magnetic transition temperature decreases with increasing Ce content. At a temperature around 100 K for the CeNi5 melt-spun ribbon, the spin fluctuations effect is visible.This research work was supported partially by VEGA 1/0404/21; VEGA 1/0705/20; VEGA 1/0053/19, and APVV-16-0079

Magneto-caloric effect in the pseudo-binary intermetallic YPrFe17 compound

We have synthesized the intermetallic YPrFe17 compound by arc-melting. X-ray and neutron powder diffraction show that the crystal structure is rhombohedral with View the MathML source space group (Th2Zn17-type). The investigated compound exhibits a broad isothermal magnetic entropy change {\Delta}SM(T) associated with the ferro-to-paramagnetic phase transition (TC \approx 290 K). The |{\Delta}SM| (\approx 2.3 J kg-1 K-1) and the relative cooling power (\approx 100 J kg-1) have been calculated for applied magnetic field changes up to 1.5 T. A single master curve for {\Delta}SM under different values of the magnetic field change can be obtained by a rescaling of the temperature axis. The results are compared and discussed in terms of the magneto-caloric effect in the isostructural R2Fe17 (R = Y, Pr and Nd) binary intermetallic alloys.Comment: Preprint, 5 pages (postprint), 4 figures, regular pape

Study on effect of Ge doping on CeNi5

The effect of the Ni/Ge substitution on the ground state of CeNi5 is presented. The new ternary germanides CeNi5−xGex (x = 0.1, 0.2) were prepared by arc melting techniques and compared with CeNi5. Both CeNi4.9Ge0.1 and CeNi4.8Ge0.2 crystallize in the CaCu5 structure. The samples resulted to be single phase as confirmed by X-ray diffraction (XRD) and by electron probe microanalysis (EPMA). No phase transition was observed from measurements of susceptibility, magnetization, resistivity and heat capacity, although substitution of Ge/Ni seems to favor the suppression of spin fluctuations

The role of crystal chemistry in YbCu5xAux

The role of crystal chemistry in YbCu5-xAux crystallizing in the FCC AuBe5-type structure is highlighted through the study of the 0.7 ≥ x ≥ 0.4 region. Magnetic frustration, due to the magnetic Yb-ions forming a network of edge-sharing tetrahedra, seems to play an important role in the evolution of the ground state of the system. Significant differences are found among the YbCu5-xAux compounds compared to the cubic isotypic systems YbCu5-xAgx and YbCu5.Fil: Giovannini, Mauro. Università degli Studi di Genova; Italia. Consiglio Nazionale delle Ricerche; ItaliaFil: Čurlík, Ivan. University of Prešov; EslovaquiaFil: Gastaldo, Federica. Università degli Studi di Genova; ItaliaFil: Reiffers, Mariȥn. University of Prešov; EslovaquiaFil: Sereni, Julian Gustavo Renzo. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentin

Introduction to special section on former child soldiers' rehabilitation: Connecting individual and communal worlds

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