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Onset of Magnetic Order in U2(Ni1−xFex)2Sn-H
S. Maˇskov´a,L. Havela,A. Kolomiets,K. Miliyanchuk,A. V. Andreev,H. Nakotte,J. Peterson,Y. Skourski,S. Yasin,S. Zherlitsyn,J. Wosnitza 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We present specific heat and magnetic studies as a function of temperature and magnetic field for U2(Ni1−xFex)2Sn alloys (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.4, 0.6 and 0.8) and their hydrides (absorption of ≈ 2 H/f.u.). For the parent alloys, antiferromagnetic order is rapidly suppressed with increasing Fe concentration and non-Fermi-liquid behavior was found for x = 0.2. Hydrogenation of the parent alloys causes a substantial increase of TN in Fe-low hydrides (x < 0.2), while Fe-rich hydrides show an unexpected appearance of ferromagnetism in the range 0.4 ≤ x ≤ 0.8. Some of the findings are compared with similar studies in U2Co2Sn and U2Co2InH1.9.
S. O. Rogachev,V. A. Andreev,V. S. Yusupov,S. A. Bondareva,V. M. Khatkevich,E. V. Nikolaev 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
The influence of a degree of strain by rotary forging, as well as post-deformation annealing on the structure and mechanicalproperties of a clad aluminum alloy/copper bimetallic material was studied. Rotary forging of the initial bimetallic billet wascarried out step by step from a diameter of 20.1 mm to a diameter of 2.4 mm. Rotary forging of the aluminum alloy/copperbimetallic material to a diameter of 5.3 mm leads to the formation of a mixed fine-grained and nanocrystalline orientedstructure in an aluminum shell and to a decrease in the average grain size by 4.5 times and to an increase in the density ofcrystalline defects in a copper core. A reduction in the aluminum alloy/copper bimetallic material diameter to 2.4 mm (withintermediate annealing) leads to the formation of a fine-grained elongated grain-subgrain oriented structure in the aluminumshell and to the formation of a mixed cellular and subgrain structure in a copper core. Rotary forging leads to a significantincrease in the strength of the aluminum alloy/copper bimetallic material and to a decrease in ductility. The optimal combinationof increased strength and satisfactory ductility provides post-deformation annealing.
Magnetism of ordered and disordered alloys of R<sub>2</sub>Fe<sub>14</sub>B (R=Nd, Er) type
Teplykh, A.E.,Chukalkin, Yu.G.,Lee, S.,Bogdanov, S.G.,Kudrevatykh, N.V.,Rosenfeld, E.V.,Skryabin, Yu.N.,Choi, Y.,Andreev, A.V.,Pirogov, A.N. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.581 No.-
Magnetic susceptibility, magnetization and neutron diffraction measurements have been performed to study structure and magnetic states of crystalline and amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys. In the crystalline state there exists a large (about 20%) anisotropy of Er-sublattice magnetization. Values of the magnetic anisotropy constant of Er ions and the Er-Fe exchange-coupling parameter were estimated using temperature dependence of the Er- and Fe-sublattice magnetizations. Amorphous state of the samples was obtained by irradiation of fast (E<SUB>eff</SUB>≥1@?eV) neutrons with a fluence up to the 1.2x10<SUP>20</SUP>n/@?m<SUP>-2</SUP> at 340K. It is shown that antiferromagnetic coupling between the rare-earth and iron spins is kept in the amorphous state. Amorphization of the samples is found to result in reduction of the Curie temperature (T<SUB>C</SUB>) by about 200K and almost total absence of coercivity. We suggest that the strong decrease of T<SUB>C</SUB> is a consequence of enhancement of negative Fe-Fe interactions as a result of dispersion of interatomic distances, which is a characteristic feature of the amorphous state.
Pressure change dynamics of plasma focus chambers as a part of the pulse neutron generators
Mikhailov Yu.V.,Prokuratov I.A.,Lemeshko B.D.,Morozov V.M.,Dulatov A.K.,Charaev O.A.,Rukoliansky A.O.,Andreev V.G.,Litvinov I.N. 한국물리학회 2022 Current Applied Physics Vol.39 No.-
The dynamics of working gas pressure changes in the plasma focus (PF) chambers were studied by using the chamber with a built-in manometer as part of the ING-102 neutron generator (2.5 MeV neutron yield 106÷107 neutrons/pulse). Investigations were carried out during high-voltage training and neutron emission operation mode. The studies were executed while filling the chamber with various gas mixtures. For operation with a deuterium-tritium mixture, a sealed-off chamber with a built-in gas generator was used. After the primary filling of the PF chambers with a gas mixture, there is a systematic decrease in pressure by Δp = (5 ÷ 50)⋅10-3 Torr (~0,7 ÷ 7 Pa) after each shot of the chamber. The change in the shape of breakdown curves Ubr(p) in the interelectrode gap of the chamber after each series of shots was studied. That made it possible to assess the optimal number of shots during high-voltage training of the PF chamber.
Search for an invisibly-decaying Higgs boson at LEP
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagnaia, P.,Bajo, A.,Ba Elsevier 2005 Physics letters: B Vol.609 No.1
<P><B>Abstract</B></P><P>A search for a Higgs boson produced in <SUP>e+</SUP><SUP>e−</SUP> collisions in association with a Z boson and decaying into invisible particles is performed. Data collected at LEP with the L3 detector at centre-of-mass energies from 189 to 209 GeV are used, corresponding to an integrated luminosity of 0.63 fb<SUP>−1</SUP>. Events with hadrons, electrons or muons with visible masses compatible with a Z boson and missing energy and momentum are selected. They are consistent with the Standard Model expectations. A lower limit of 112.3 GeV is set at 95% confidence level on the mass of the invisibly-decaying Higgs boson in the hypothesis that its production cross section equals that of the Standard Model Higgs boson. Relaxing this hypothesis, upper limits on the production cross section are derived.</P>
A search for flaring very-high-energy cosmic γ-ray sources with the L3+C muon spectrometer
Achard, P.,Adriani, O.,Aguilar-Benitez, M.,van den Akker, M.,Alcaraz, J.,Alemanni, G.,Allaby, J.,Aloisio, A.,Alviggi, M.G.,Anderhub, H.,Andreev, V.P.,Anselmo, F.,Arefiev, A.,Azemoon, T.,Aziz, T.,Bagna Elsevier 2006 Astroparticle physics Vol.25 No.5
<P><B>Abstract</B></P><P>The L3+C muon detector at the CERN electron–positron collider, LEP, is used for the detection of very-high-energy cosmic γ-ray sources through the observation of muons of energies above 20, 30, 50 and 100GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known γ-ray sources. No statistically significant excess is observed for any direction or any particular source.</P>
Chukalkin, Yu.G.,Teplykh, A.E.,Kudrevatykh, N.V.,Choo, K.N.,Lee, S.,Andreev, A.V.,Pirogov, A.N. Elsevier 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.615 No.-
<P><B>Abstract</B></P> <P>Magnetization and neutron diffraction measurements have been carried out to study evolution of structure and magnetic states of amorphous Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and Er<SUB>2</SUB>Fe<SUB>14</SUB>B alloys under isothermal annealing at 295–1025K. The amorphization have been performed by neutron irradiation which provides a homogeneous state in different with other methods of amorphization. The annealing induces a rise of α-Fe phase content in alloys and a recrystallization into Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type phase. Neutron diffraction data show that the recrystallization occurs over narrow temperature interval (590–638) K in Er<SUB>2</SUB>Fe<SUB>14</SUB>B and at around 800K in Nd<SUB>2</SUB>Fe<SUB>14</SUB>B. Magnetic measurements testify that in both samples the magnetization and coercive field increase with annealing temperature above 800K.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Annealing of R<SUB>2</SUB>Fe<SUB>14</SUB>B amorphized by fast neutrons. </LI> <LI> Annealing leads to crystallization above 600 K (R = Er) and 800 K (R = Nd). </LI> <LI> Crystallization is accompanied by increase of magnetization and coertivity. </LI> </UL> </P>