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Yu. G. Pashkevich
Researcher at National Academy of Sciences of Ukraine
Publications - 96
Citations - 1020
Yu. G. Pashkevich is an academic researcher from National Academy of Sciences of Ukraine. The author has contributed to research in topics: Raman spectroscopy & Phonon. The author has an hindex of 15, co-authored 92 publications receiving 918 citations.
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Journal ArticleDOI
Coexistence of superconductivity and magnetism in FeSe 1 − x under pressure
Markus Bendele,Markus Bendele,A. Ichsanow,Yu. G. Pashkevich,Lukas Keller,Th. Strässle,A. A. Gusev,Ekaterina Pomjakushina,Kazimierz Conder,Rustem Khasanov,Hugo Keller +10 more
TL;DR: In this paper, an extended investigation of the electronic phase diagram of FeSe up to pressures of 2.4$ GPa by means of ac and dc magnetization, zero-field muon spin rotation (ZF $\ensuremath{\mu}$SR), and neutron diffraction is presented.
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Interplay of rare earth and iron magnetism in RFeAsO (R=La, Ce, Pr, and Sm): Muon-spin relaxation study and symmetry analysis
H. Maeter,Hubertus Luetkens,Yu. G. Pashkevich,Andrej Kwadrin,Rustem Khasanov,Anthony A. Amato,A. A. Gusev,K. V. Lamonova,D. A. Chervinskii,Rüdiger Klingeler,Christian Hess,Günter Behr,Bernd Büchner,Hans-Henning Klauss +13 more
TL;DR: In this article, the interaction of the FeAs and $R$ (rare-earth) electronic systems in the nonsuperconducting magnetically ordered parent compounds of the superconducting superconductors was studied via a detailed comparison of the local hyperfine fields at the muon site with available Mossbauer spectroscopy and neutron scattering data.
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Helical fluctuations in the Raman response of the topological insulator Bi2Se3
Vladimir M. Gnezdilov,Yu. G. Pashkevich,Helmuth Berger,Ekaterina Pomjakushina,K. Conder,Peter Lemmens +5 more
TL;DR: The topological insulator Bi2Se3 shows a Raman-scattering (RS) response related to topologically protected surface states amplified by a resonant interband transition, which has a characteristic Lorentzian lineshape and spin-helical symmetry due to collisiondominated scattering of Dirac states at the Fermi level E-F on bulk-valence states as discussed by the authors.
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Microscopic evidence of spin state order and spin state phase separation in layered cobaltites RBaCo2O5.5 with R=Y, Tb, Dy, and Ho.
Hubertus Luetkens,M. Stingaciu,Yu. G. Pashkevich,Kazimierz Conder,Ekaterina Pomjakushina,A. A. Gusev,K. V. Lamonova,Peter Lemmens,Hans-Henning Klauss +8 more
TL;DR: In this paper, the muon-spin relaxation measurements on the magnetic structures of octahedra were performed and three different phases, one ferrimagnetic and two antiferromagnetic, were identified below 300 K.
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Anomalous optical phonons in FeTe chalcogenides: Spin state, magnetic order, and lattice anharmonicity
Vladimir M. Gnezdilov,Yu. G. Pashkevich,Peter Lemmens,A. A. Gusev,K. V. Lamonova,T. N. Shevtsova,Ilya Vitebskiy,O. Afanasiev,S. L. Gnatchenko,Vladimir Tsurkan,Vladimir Tsurkan,Joachim Deisenhofer,Alois Loidl +12 more
TL;DR: In this article, a relation between the magnitude of ordered magnetic moments and the linewidth of phonons at low temperatures was found, attributed to the intermediate spin state and the orbital degeneracy of Fe ions.