On the T-Odd Quark Fragmentation Function and on Transversal Handedness

The first probe of the correlation of the T-odd one-particle fragmentation function responsible for the left--right asymmetry of fragmentation of a transversely polarized quark is done by using the 1991-95 DELPHI data for $Z\to 2$-jet decay. Integrated over the fraction of longitudinal and transversal momenta, this correlation is of 1.5% order, which means order of 13% for the analyzing power. A rather large ($\approx 10$) handedness transversal to the production plane was observed in the diffractive production of ($\pi^-\pi^+\pi^-$) triples from nuclei by the $40 GeV/c \pi^-$--beam. It was shown that the phenomenon has a clear dynamic origin and resembles the single spin asymmetry behavior. All this makes us hope to use this effects in polarized DIS experiments for transversity measurement.Comment: 10 pp, 5 epsfig, Latex 2e, szjp.cls, epsfig.sty, wrapfig.sty included. Talk in "Spin and Symmetry - Praha98". To be published in Czechoslovak Journal of Physics, Supp

Crystalline electric fields and the ground state of YbRh2Si2 and YbIr2Si2

We have constructed the crystalline electric field (CEF) splitting of the energy levels of Yb3+ (4f13) in the clean intermetallic compounds YbRh2Si2 and YbIr2Si2. The data of measurements using methods of inelastic neutron scattering, electron spin resonance, and Mössbauer spectroscopy, together with relevant structural, thermodynamic, and magnetic properties, were used as input to calculations of the CEF level schemes in these non-Fermi-liquid systems. The experimental data of both compounds are found to be well explained on the basis of the CEF 4f-schemes with the Γt 6 - (1) ground state symmetry. © 2007 Elsevier B.V. All rights reserved

Hybridized electronic states in dense intermetallics as studied by ESR

We review electron spin resonance (ESR) experiments in several concentrated Yb-, Ce-, and Eubased intermetallic systems. Recent theoretical studies attribute well resolved ESR signals with hybridization effects between 4f and conduction electrons (CE) in the presence of ferromagnetic (FM) fluctuations. We believe that the ESR absorption is caused here by a novel type of ESR excitations - hybridized electronic states, which are created in some strongly correlated electronic systems due to hybridization between the 4f-orbitals and the wavefunctions of the CE of the outer d, s, and p shells in conjunction with FM RKKY interaction. © (2011) Trans Tech Publications

Study of correlation of production and decay planes in π→3π\pi\to3\pi diffractive dissociation process on nuclei

A large correlation of production and decay planes of (\pi^-\pi^+\pi^-)-system in dissociation of $\pi^-$-beam 40 GeV/c on nuclear targets was observed. The dependence of the correlation on atomic number, Feynmann variable and transversal momentum as well as on invariant mass of the pion triple and neutral pion pair were investigated. It was shown that the phenomenon has a clear dynamic origin and resembles the single spin asymmetry behavior.Comment: 8 pages, latex epsfig.sty, 5 eps figures. Submitted to Yad. Fiz

Evolution of the 4f electron localization from YbRh2Si 2 to YbRh2Pb studied by electron spin resonance

We report on electron spin resonance (ESR) experiments on the Heusler alloy YbRh2Pb and compare its spin dynamics with that of several other Yb-based intermetallics. A detailed analysis of the derived ESR parameters indicates the extremely weak hybridization, more localized distribution of the 4f states, and a smaller RKKY interaction in YbRh2Pb. These findings reveal the important interplay between hybridization effects, chemical substitution, and crystalline electric field interactions that determines the ground state properties of strongly correlated electron systems. © 2014 Pleiades Publishing, Inc

Electronic hybridization effects in dense intermetallics measured by electron spin resonance

Recent theoretical studies associate the unexpected well resolved electron spin resonance (ESR) signals below Kondo temperature in several undoped heavy-fermion (HF) compounds with hybridization effects between 4f and conduction electrons (CE) in the presence of ferromagnetic (FM) fluctuations. We analyze ESR experiments in different concentrated Yb-, Ce-, and Eu-based intermetallic systems. We believe that the exotic ESR absorption here is caused by a novel type of ESR excitations - hybridized electronic states, which can be created in some strongly correlated electronic systems due to hybridization between the 4f-orbitals and the wave functions of the CE of the outer electronic shells in conjunction with FM RKKY interaction. © Published under licence by IOP Publishing Ltd

Crystal field of Yb3+ tetragonal centers in the YbRh 2Si2 intermetallic compound

The spectra of electron paramagnetic resonance and inelastic neutron scattering in crystals of the heavy-fermion intermetallic compound YbRh 2Si2 are interpreted. The phenomenological potentials of the crystal electric field of Yb3+ tetragonal centers and the parameter of the Hamiltonian for the spin-orbit interaction of electrons are determined from the experimental energy level schemes. A comparison of the results obtained from experimental data on electron paramagnetic resonance, inelastic neutron scattering, and Mössbauer spectroscopy shows that the most probable ground state of Yb3+ ions in the YbRh 2Si2 crystal is the Kramers doublet Γ t6 - . © 2007 Pleiades Publishing, Ltd

ESR study of spin dynamics in the ternary phosphide YbRh 6P 4

We have used electron spin resonance (ESR) to investigate the YbRh 6P 4 powder samples. It is shown that the exotic ESR absorption is caused here by hybridization effects between the Yb 4 f-orbitals and the wave functions of the conduction electrons (CE) of the outer electronic shells. A broadening and disappearance of the ESR line at temperatures above 10 K can be explained by the processes of the spin-lattice relaxation of the Yb 3+ ions through the first excited Stark sublevel with an activation energy Δ ≈82.1 K

Magnetic behavior of the nanophase of YbNi<inf>2</inf> alloys

© 2017, Pleiades Publishing, Ltd.Variations in magnetic properties of the heavy-fermion YbNi2 alloy when milled in a high energy ball milling system have been investigated. The ferromagnetic transition (TC = 10.4 K) in the initial sample almost vanishes after milling, which leads to the appearance of a magnetic transition at T* = 3.2 K in nanocrystallites. Before milling, processes of spin–lattice relaxation of the Orbach–Aminov type with the participation of the first excited Stark sublevel of the Yb3+ ion located at 75 K are dominating in the electron spin dynamics in the paramagnetic phase of the alloy. A comparative study of the temperature dependence of the magnetic properties and spectra of electron paramagnetic resonance in poly- and nanocrystalline samples indicates the existence of a magnetic inhomogeneity of the compound arising upon milling