?
Formation of the S = 1 paramagnetic centers in the bond-diluted spin-gap magnet
Journal of Physics: Condensed Matter. 2016. Vol. 28. No. 206003. P. 1-6.
Electron spin resonance experiment reveals that non-magnetic bond doping of the spin-gap magnet (C4H12N2)Cu2Cl6 (abbreviated PHCC) results in the formation of S = 1 paramagnetic centers that dominate low-temperature ESR response. We have followed evolution of this signal with doping impurity content and have found that the concentraion of these centers is
quadratic over the impurity content. We also observe coexistence of the ESR responses from these local centers and from delocalized triplet excitations over a certain temperature range.
V.N.Glazkov, Faizullin M., Yu.V.Krasnikova et al., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 92 No. 184403 P. 1-12
Evolution of the ESR absorption in a strong-leg spin ladder magnet (C7H10N)2CuBr4 (abbreviated as DIMPY)
is studied from 300 K to 400 mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers
between different relaxation regimes. We argue that the main mechanism of ESR line broadening in DIMPY is
uniform Dzyaloshinskii-Moriya interaction (|D| = 0.31 K) ...
Added: October 18, 2016
V.N.Glazkov, Skoblin G., Hüvonen D. et al., Journal of Physics: Condensed Matter 2014 Vol. 26 P. 486002
We report results of an electron spin resonance (ESR) study of a spin-gap antiferromagnet (C4H12N2)(Cu2Cl6) (nicknamed PHCC) with chlorine ions partially substituted by bromine. We found that up to 10% of nominal doping the contribution of the random defects to the absorption spectra remains at about 0.1% per copper ion, which is almost the same ...
Added: October 18, 2016
Popova E., Известия Уфимского научного центра РАН 2023 № 1 С. 75-80
In the compounds of the (Y1-xNdx)2BaNiO5 family, the paradoxical coexistence of the Haldane phase and spin waves is realized. The magnetic ordering in the system is caused by the interaction of Nd3+ ions through spin fluctuations of a nickel chain, which remains internally disordered. Nd3+ magnetic moments do not deviate from the c axis of ...
Added: March 22, 2023
Demishev S. V., Doklady Physics 2021 Vol. 66 No. 7 P. 187-190
The Landau–Lifshitz equation modified by quantum fluctuations of the magnetic moment is proposed, on the basis of which several new effects in electron paramagnetic resonance in strongly correlated electronic systems are predicted, including an increase in the integral intensity and the appearance of universal relations connecting the contribution to the linewidth, the shift of the ...
Added: October 25, 2022
Leevik Y., Shaginyan V. R., Msezane A. Z. et al., Condensed Matter 2019 Vol. 4 No. 3 P. 1-20
In our review, we focus on the quantum spin liquid (QSL), defining the thermodynamic, transport, and relaxation properties of geometrically frustrated magnet (insulators) represented by herbertsmithite ZnCu3(OH)6Cl2ZnCu3(OH)6Cl2 . The review mostly deals with an historical perspective of our theoretical contributions on this subject, based on the theory of fermion condensation closely related to the emergence ...
Added: October 30, 2019
Bush A. A., Buttgen N., Gippius A. A. et al., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 P. 104411
We present the results of magnetization, electron spin resonance (ESR), and nuclear magnetic resonance (NMR)
measurements on single-crystal samples of the frustrated S = 1/2 chain cuprate LiCu2O2 dopedwith nonmagnetic
Zn2+.As shown by the x-ray techniques, the crystals of Li(Cu1−xZnx )2O2 withx < 0.12 are single-phase,whereas
for higher Zn concentrations the samples were polyphase. ESR spectra for all ...
Added: October 18, 2016
Sosin S., Яфарова А. Ф., Романова И. В. et al., Письма в Журнал экспериментальной и теоретической физики 2022 Т. 116 № 11-12 С. 747-755
Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY1 – xGdxF4 with low x = 0.005 and moderate x = 0.05 concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters ...
Added: December 7, 2022
Yaouanc A., Dalmas de Reotier P., Bonville P. et al., Physical Review Letters 2013 Vol. 110 P. 127207
From magnetic, specific heat, 170Yb Mossbauer effect, neutron diffraction, and muon spin relaxation measurements on polycrystalline Yb2Sn2O7, we show that below the first order transition at 0.15 K all of the Yb3+ ions are long-range magnetically ordered and each has a moment of 1.1 Bohr magneton which lies at 10 degrees to a common fourfold ...
Added: October 18, 2016
Semeno A. V., Anisimov M. A., Bogach A. V. et al., Scientific Reports 2020 Vol. 10 P. 1-10
Randomness and frustration are believed to be two crucial criteria for the formation of spin glass state. However, the spin freezing occurs in some well-ordered crystals below the related temperature Tf due to the instability of each spin state, which induces the variation of either magnetic moment value or exchange energy. Here we explore the ...
Added: December 25, 2020
Demishev S. V., Semeno A. V., Applied Magnetic Resonance 2022 Vol. 53 No. 11 P. 1505-1516
A simple semi-classical model of magnetization dynamics based on Landau-Lifshits equation of motion with anisotropic effective g-tensor and anisotropic spin relaxation is proposed and applied to the case of electron paramagnetic resonance (EPR). In the Faraday geometry, the model predicts polarization effect consisting in strong dependence of the EPR line shape and magnitude on orientation ...
Added: October 25, 2022
V.N.Glazkov, Casola F., Ott H. -. et al., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 87 P. 054427
We present a detailed analysis of the phase diagram of antiferromagnets with competing exchange-driven and field-induced order parameters. By using the quasi-1D antiferromagnet BaCu2Si2O7 as a test case, we demonstrate that a model based on a Landau type of approach provides an adequate description of both the magnetization process and of the phase diagram. The ...
Added: October 18, 2016
Shaginyan V. R., Msezane A. Z., Artamonov S. et al., EPL 2021 Vol. 136 (2021) No. 17003 Article 17003
We analyze recent measurements of C⁄T , specific heat C divided by temperature T , of recently observed ultra spin liquid. The measurements are carried out in magnetic fields on the triangular lattice compound Lu3Cu2Sb3O14. We show that the obtained heat capacity Cmag formed by ultra spin liquid as a function of temperature T versus ...
Added: October 31, 2021
Shaginyan V. R., Msezane A. Z., Clark J. W. et al., JETP Letters 2020 Vol. 112 No. 10 P. 700-702
In our mini-review, we address manifestations of T/B scaling behavior of heavy-fermion (HF) compounds, where T and B are respectively temperature and magnetic field. Using experimental data and the fermion condensation theory, we show that this scaling behavior is typical of HF compounds including HF metals, quasicrystals, and quantum spin liquids. We demonstrate that such scaling behavior holds down to the ...
Added: October 27, 2020
S. V. Demishev, Gilmanov M. I., Samarin A. N. et al., Applied Magnetic Resonance 2020 Vol. 51 No. 1 P. 71-84
The low temperature (T < 5 K) electron spin resonance in topological Kondo insulator SmB6 is investigated. It is shown that spin relaxation time of the paramagnetic centers responsible for low temperature electron spin resonance in SmB6 is about ~ 10−8 s, which exceeds by five orders of magnitude the widely accepted spin and charge fluctuation time ~ 10−13 s in the homogeneous ...
Added: December 24, 2020
V. N. Glazkov, Yu. V. Krasnikova, Rodygina I. K. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 Article 014414
A low-temperature magnetic resonance study of the quasi-two-dimensional antiferromagnet Cu(en)(H2O)2SO4 (en = C2H8N2) was performed down to 0.45 K. This compound orders antiferromagnetically at 0.9 K. The analysis of the resonance data within the hydrodynamic approach allowed us to identify anisotropy axes and to estimate the anisotropy parameters for the antiferromagnetic phase. Dipolar spin-spin coupling ...
Added: January 28, 2020
Katushkina O. A., Quemerais E., Izmodenov V.V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2017 Vol. 122 No. 11 P. 10921-10937
In this work, we present for the first time the Lyman α intensities measured by Voyager 1/UVS in 2003–2014 (at 90–130 AU from the Sun). During this period Voyager 1 measured the Lyman α emission in the outer heliosphere at an almost fixed direction close to the upwind (i.e.“ toward the interstellar flow). The data show an unexpected behavior in 2003–2009: the ...
Added: January 26, 2018
Aaij R., Abdelmotteleb A. S., Abellan Beteta C. et al., The European Physical Journal C - Particles and Fields 2023 Vol. 83 Article 543
https://link.springer.com/article/10.1140/epjc/s10052-023-11673-x#Abs1 ...
Added: December 4, 2023
Ружицкая Д. Д., САМОЙЛЕНКО А. А., Иванов А. Д. et al., Optoelectronics, Instrumentation and Data Processing 2017 Vol. 54 No. 1 P. 1-8
This paper presents an algorithm for processing the transmission spectra of whisperinggallery optical microcavities for use as a nanoparticle detector. The algorithm is based on the broadening of the microcavity resonance curve during precipitation of nanoparticles on the microcavity surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution ...
Added: May 25, 2018
М. : National Instruments Russia, 2017
Содержание сборника составляют доклады с результатами оригинальных исследований и технических решений, ранее не публиковавшиеся. Мы надеемся, что предлагаемый сборник окажется полезным для специалистов, работающих в различных областях науки и техники, для широкого круга преподавателей, аспирантов и студентов ВУЗов, а также для преподавателей средних школ и технических колледжей. ...
Added: May 10, 2017
Загорский Д. Л., Долуденко И. М., Каневский В. М. et al., Известия РАН. Серия физическая 2021 Т. 85 № 8 С. 1088-1094
FeCo and FeNi alloyed nanowires (NW) were obtained by the matrix synthesis method: the effect of the
growth voltage and the effect of using a reference electrode were studied. It is shown that the composition of
FeNi nanowires strongly depends on the growth potential (with its increase, the bcc structure is changing into
fcc), and it is also ...
Added: November 12, 2021
Panina I., Balandin S., Tsarev A. et al., International Journal of Molecular Sciences 2023 Vol. 24 No. 2 P. 1
To date, a number of lantibiotics have been shown to use lipid II — a highly conserved peptidoglycan precursor in the cytoplasmic membrane of bacteria — as their molecular target. The α-component (Lchα) of the two-component lantibiotic lichenicidin (Lchα), previously isolated from the Bacillus licheniformis VK21 strain, seems to contain two putative lipid II binding ...
Added: February 21, 2023
Alfimov M., Litvinov A., Journal of High Energy Physics 2022 No. 01 Article 43
We study regularization scheme dependence of beta-function for sigma models with two-dimensional target space. Working within four-loop approximation, we conjecture the scheme in which the beta-function retains only two tensor structures up to certain terms containing zeta_3. Using this scheme, we provide explicit solutions to RG flow equation corresponding to Yang-Baxter- and lambda-deformed SU(2)/U(1) sigma ...
Added: February 1, 2022
Min Namkung, Younghun K., Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18
Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum
states when N receivers are separately located. In this report, we propose optical designs that can
perform sequential state discrimination of two coherent states. For this purpose, we consider not
only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior
probabilities. Since ...
Added: November 16, 2020
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016