45 citations · 298 across the 20 of their papers we have counts for
20 papers
Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor RuB to the London model
A. S. Cameron, Y. V. Tymoshenko, P. Y. Portnichenko +6
The noncentrosymmetric superconductor RuB has in previous studies demonstrated remarkably unusual behaviour in its vortex lattice, where the nearest neighbour directions of…
Cascade of magnetic-field-driven quantum phase transitions in Ce3Pd20Si6
F. Mazza, P. Y. Portnichenko, S. Avdoshenko +8
Magnetically hidden order is a hypernym for electronic ordering phenomena that are visible to macroscopic thermodynamic probes but whose microscopic symmetry cannot be revealed wit…
Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor RuB
A. S. Cameron, Y. S. Yerin, Y. V. Tymoshenko +8
One of the key effects which is predicted to arise in superconductors without a centre of inversion is the mixing of singlet and triplet order parameters, which are no longer good…
Local origin of the strong field-space anisotropy in the magnetic phase diagrams of CeLaB measured in a rotating magnetic field
D. S. Inosov, S. Avdoshenko, P. Y. Portnichenko +4
Cubic f-electron compounds commonly exhibit highly anisotropic magnetic phase diagrams consisting of multiple long-range ordered phases. Field-driven metamagnetic transitions betwe…
Destruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu2GaBO5 and Cu2AlBO5 ludwigites
A. A. Kulbakov, R. Sarkar, O. Janson +12
The quantum spin systems CuM'BO (M' = Al, Ga) with the ludwigite crystal structure consist of a structurally ordered Cu sublattice in the form of three-leg ladders,…
Neutron-scattering studies of spin dynamics in pure and doped CeB6
P. Y. Portnichenko, A. S. Cameron, D. S. Inosov
As a simple cubic system with only one f electron per cerium ion, CeB6 is of model character to investigate the interplay of orbital phenomena with magnetism. It is also a textbook…
Field-angle resolved magnetic excitations as a probe of hidden-order symmetry in CeB6
P. Y. Portnichenko, A. Akbari, S. E. Nikitin +17
In contrast to magnetic order formed by electrons' dipolar moments, ordering phenomena associated with higher-order multipoles (quadrupoles, octupoles, etc.) are more difficult to…
Magnetic Dynamics in Heavy-Fermion Systems with Multipolar Ordering Studied by Neutron Scattering
Pavlo Y. Portnichenko
Despite more than half a century of studies in heavy-fermion compounds, a full understanding of the various possible magnetic ordering phenomena is still far from complete. Some he…
Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry
A. S. Cameron, Y. S. Yerin, Y. V. Tymoshenko +7
We observe a hysteretic reorientation of the magnetic vortex lattice in the noncentrosymmetric superconductor Ru7B3, with the change in orientation driven by altering magnetic fiel…
Evolution of the propagation vector of antiferroquadrupolar phases in Ce3Pd20Si6 with magnetic field
P. Y. Portnichenko, S. E. Nikitin, A. Prokofiev +7
Hidden-order phases that occur in a number of correlated f-electron systems are among the most elusive states of electronic matter. Their investigations are hindered by the insensi…
Doping-induced redistribution of magnetic spectral weight in substituted hexaborides CeLaB and CeNdB
S. E. Nikitin, P. Y. Portnichenko, A. V. Dukhnenko +6
We investigate the doping-induced changes in the electronic structure of CeB on a series of substituted CeB samples ( = La, Nd) using diffuse neutron scatteri…
Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal CeLaB
D. J. Jang, P. Y. Portnichenko, A. S. Cameron +8
For the last few decades, researchers have been intrigued by multipolar ordering phenomena while looking for the related quantum criticality in the heavy-fermion Kondo system Ce$_{…
Pseudo-Goldstone magnons in the frustrated S=3/2 Heisenberg helimagnet ZnCr2Se4 with a pyrochlore magnetic sublattice
Y. V. Tymoshenko, Y. A. Onykiienko, T. Mueller +13
Low-energy spin excitations in any long-range ordered magnetic system in the absence of magnetocrystalline anisotropy are gapless Goldstone modes emanating from the ordering wave v…
Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6
P. Y. Portnichenko, S. Paschen, A. Prokofiev +5
The clathrate compound Ce3Pd20Si6 is a heavy-fermion metal that exhibits magnetically hidden order at low temperatures. Reputedly, this exotic type of magnetic ground state, known…
Magnetic field dependence of the neutron spin resonance in CeB6
P. Y. Portnichenko, S. V. Demishev, A. V. Semeno +12
In zero magnetic field, the famous neutron spin resonance in the f-electron superconductor CeCoIn5 is similar to the recently discovered exciton peak in the non-superconducting CeB…
Magnetic phase diagram of the helimagnetic spinel compound ZnCr2Se4 revisited by small-angle neutron scattering
A. S. Cameron, Y. V. Tymoshenko, P. Y. Portnichenko +7
We performed small-angle neutron scattering (SANS) measurements on the helimagnetic spinel compound ZnCr2Se4. The ground state of this material is a multi-domain spin-spiral phase,…
Magnon spectrum of the helimagnetic insulator Cu2OSeO3
P. Y. Portnichenko, J. Romhanyi, Y. A. Onykiienko +11
Complex low-temperature ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 be…
Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic (CaFePtAs)PtAs
M. A. Surmach, F. Brückner, S. Kamusella +11
Using a combination of muon-spin relaxation (SR), inelastic neutron scattering (INS) and nuclear magnetic resonance (NMR), we investigated the novel iron-based superconductor wi…
Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6
P. Y. Portnichenko, A. S. Cameron, M. A. Surmach +8
Among heavy-fermion metals, CePdSi is one of the heaviest-electron systems known to date. Here we used high-resolution neutron spectroscopy to observe low-energy mag…
One-Dimensional Dispersive Magnon Excitation in the Frustrated Spin-2 Chain System Ca3Co2O6
Anil Jain, P. Y. Portnichenko, Hoyoung Jang +7
Using inelastic neutron scattering, we have observed a quasi-one-dimensional dispersive magnetic excitation in the frustrated triangular-lattice spin-2 chain oxide Ca3Co2O6. At the…