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Direct determination of exchange parameters in Cs2CuBr4 and Cs2CuCl4: high-field ESR studies
Physical Review Letters. 2014. Vol. 112. P. 077206.
Zvyagin S. A., Kamenskyi D., Ozerov M., Wosnitza J., Ikeda M., Fujita T., Hagiwara M., Smirnov A., Soldatov T. A., Shapiro A. Y., Krzystek J., Hu R., Ryu H., Petrovic C., Zhitomirsky M. E.
Spin-
Smirnov A., Soldatov T. A., Povarov K. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 92 P. 134417
The electron spin resonance spectrum of a quasi-1D S=1/2 antiferromagnet K2CuSO4Br2 was found to demonstrate an energy gap and a doublet of resonance lines in a wide temperature range between the Curie-Weiss and Neèl temperatures. This type of magnetic resonance absorption corresponds well to the two-spinon continuum of excitations in S=1/2 antiferromagnetic spin chain with ...
Added: October 22, 2016
Gotovko S.K., Marchenko V. I., Prokofiev A. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 21 Article 214415
We present the electron spin resonance study of the influence of an electric field on the low-field multiferroic magnetic state in LiCuVO4. The shift of the magnetic resonance spectra in the electric field has been observed experimentally. Symmetry analysis has been performed in order to describe the static properties of the magnetic system. The low-frequency dynamics ...
Added: December 10, 2021
Готовко С. К., Марченко В. И., Журнал экспериментальной и теоретической физики 2023 Т. 164 № 4 С. 569-570
It has been shown that at spin-flop transition in spiral magnets LiCuVO4, LiCu2O2 and CuCrO2,
Goldstone mode looses its stability. ...
Added: November 17, 2023
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
Pudalov V., Гимазов И. И., Таланов Ю. И. et al., JETP Letters 2023 Т. 117 № 6 С. 464-469
Using electron spin resonance spectroscopy and SQUID-magnetometry we obtained direct evidence of the
occurrence of magnetic domains in the antiferromagnetically ordered state of a single crystal. The resonance spectra of europium ions were measured in the temperature range from 4 to 200 K. Using an equation for the resonance field in an antiferromagnet that takes into account the ...
Added: November 22, 2023
Smirnov A., Soldatov T. A., Povarov K. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 91 P. 174412
The electron spin resonance doublet indicating the width of the two-spinon continuum in a spin-12 triangular lattice Heisenberg antiferromagnet Cs2CuCl4 was studied in high magnetic field. The doublet was found to collapse in a magnetic field of one-half of the saturation field. The collapse of the doublet occurs via vanishing of the high-frequency component in ...
Added: October 22, 2016
Glazkov V., Yu.Krasnikova, Soldatov T., Applied Magnetic Resonance 2016 Vol. 47 P. 1069-1080
We present an algorithm for the numeric calculation of antiferromagnetic resonance frequencies for the noncollinear antiferromagnets of general type. This algorithm uses general exchange symmetry approach (Andreev and Marchenko,
Sov. Phys. Usp. 130:39, 1980) and is applicable for description of low-energy dynamics of an arbitrary noncollinear spin structure in weak fields. Algorithm is implemented as a ...
Added: October 18, 2016
Khokhlov D. A., Rakhmanov A. L., Rozhkov A. V. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 No. 23 P. 235141
A few years ago we predicted theoretically that in systems with nesting of the Fermi surface the spin-valley half-metal has lower energy than the spin density wave state. In this paper we suggest a possible way to distinguish these phases experimentally. We calculate the dynamical spin susceptibility tensor for both states in the framework of ...
Added: October 27, 2020
Boldyrev K. N., Kuz'min N. N., Mukhin A. A. et al., PHYSICAL REVIEW MATERIALS 2021 Vol. 5 No. 10 Article 104413
We measured the heat capacity, magnetic susceptibility, magnetization, magnetoelectric effect, and optical spectra of samarium chromium borate crystals. It was found that, in SmCr3(BO3)4 single crystals, structures with the space groups R32 and C2/c may coexist. Magnetic phase transitions were discovered at temperatures TN1=7.8±0.5K, TN2=6.7±0.5K, and T3=4.3±0.2K, and assumptions about their nature were made. Based on the high-resolution optical spectra and magnetometry data, the ...
Added: October 31, 2021
Krasnikova Y., Glazkov V., Ponomaryov A. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 14 P. 144446-1-144446-7
We have studied electron spin resonance (ESR) absorption spectra for the nonmagnetically diluted strong-leg spin ladder magnet (C7H10N)2Cu(1−x)ZnxBr4 (abbreviated as DIMPY) down to 450 mK. Formation of the clusters with nonzero net magnetization is confirmed; the cluster-cluster interaction is evidenced by the concentration dependence of ESR absorption. High-temperature spin-relaxation time was found to increase with nonmagnetic ...
Added: November 15, 2019
Soldatov T. A., Smirnov A., Povarov K. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 P. 104410-1-104410-12
We studied electron spin resonance in a quantum magnet NiCl2−4SC(NH2)2, demonstrating a field-induced quantum phase transition from a quantum-disordered phase to an antiferromagnet. We observe two branches of the antiferromagnetic resonance of the ordered phase, one of them has a gap, and the other is a Goldstone mode with zero frequency at a magnetic field ...
Added: October 2, 2020
Shchepetilnikov A., Khisameeva A., Nefyodov Y. A. et al., JETP Letters 2021 Vol. 113 No. 10 P. 657-661
The spin resonance of two-dimensional conduction electrons in a ZnO/MgZnO heterojunction in tilted magnetic fields is studied near the filling factor . The analysis of the spin resonance intensity at various ν values indicates that a phase transition accompanied by drastic change in the spin polarization occurs in a two-dimensional electron system at a certain ...
Added: January 9, 2022
Sherbakov A., Oleg I. Utesov, Journal of Magnetism and Magnetic Materials 2021 Vol. 518 P. 167390
Motivated by recent experiments on quantum magnet NiCl2-4SC(NH2)2 (DTN) and its Br-doped counterpart DTNX we propose a theoretical description of optical magnon branch in the antiferromagnet with large single-ion
anisotropy in the magnetically ordered phase. In the framework of the 1/S expansion we derive analytical
expressions for optical magnon with \bf{k} = 0 energy magnetic field dependence ...
Added: January 15, 2021
A. I. Smirnov, Soldatov T. A., Povarov K. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 P. 144440
Electron spin resonance (ESR) experiments in the quasi-one-dimensional (quasi-1D) S=12 antiferromagnet K2CuSO4Cl2 reveal the opening of a gap in the absence of magnetic ordering, as well as an anisotropic shift of the resonance magnetic field. These features of the magnetic excitation spectrum are explained by a crossover between a gapped spinon-type doublet ESR formed in ...
Added: January 21, 2020
Semeno A. V., Okubo S., Ohta H. et al., Applied Magnetic Resonance 2021 Vol. 52 No. 4 P. 459-472
Cerium hexaboride attracts attention of solid-state community for almost 50 years. Nowadays, this material is considered as a unique example of a system with orbital ordering resulting in formation of low-temperature magnetic phase with quadrupolar order, the so-called antiferroquadrupole phase. In crystal electric field 4f 1 state of Ce³⁺ splits into Γ7 doublet and Γ8 ...
Added: October 25, 2022
S. K. Gotovko, Soldatov T. A., L. E. Svistov et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 9 P. 094425-1-094425-8
We have carried out the electron spin resonance (ESR) study of the multiferroic triangular antiferromagnet CuCrO2 in the presence of an electric field. The shift of ESR spectra by the electric field was observed; the value of the shift exceeds that in materials with linear magnetoelectric coupling. It was shown that the low-frequency dynamics of ...
Added: February 6, 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
Shchepetilnikov A., Khisameeva A. R., Dremin A. A. et al., JETP Letters 2022 Vol. 115 No. 9 P. 548-552
Weak antilocalization in a narrow AlAs quantum well containing a two-dimensional electron system with a large effective mass at low temperatures has been studied. Such quantum corrections are due to a strong spin–orbit coupling in it. The spin–orbit interaction constant has been determined from the approximation of experimental data by a theoretical model in the ...
Added: February 10, 2023
Magnetic properties of LiCu3O3: A quasi-two-dimensional antiferromagnet on a depleted square lattice
Bush A. A., Gotovko S.K., Ivanov V. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2024 Vol. 109 No. 11 Article 115151
LiCu3O3 is a novel two-dimensional S=1/2 antiferromagnet with randomly depleted square lattice. The crystal structure contains two types of square planes with different Cu2+→Li+ substitution rates (20% and 40%). 7Li NMR and magnetization measurements performed on single crystals of LiCu3O3 revealed the occurrence of magnetic order at Tc1=123K and the change of the magnetic state ...
Added: March 27, 2024
Shchepetilnikov A., Khisameeva A., Nefyodov Y. A. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 7 Article 075437
The electron spin resonance (ESR) of two-dimensional electrons with large effective mass was studied experimentally near even filling factors of the integer quantum Hall effect. Surprisingly, the electron spin resonance did not vanish at the exact even fillings even in the case of large electron densities, where the ground state of the system was previously ...
Added: January 10, 2022
Glushkov V. V., Demishev S. V., Samarin A. et al., Physica Status Solidi (B): Basic Research 2017 Vol. 254 No. 4 P. 1600571-1-1600571-5
Added: October 19, 2017
Shchepetilnikov A., Frolov D. D., Nefyodov Y. A. et al., Solid State Communications 2019 Vol. 291 P. 21-23
Relaxation of nuclear spins located in the vicinity of 2D electron system confined in a 16 nm [001] AlAs/AlGaAs quantum well was studied with the aid of electron spin resonance (ESR) in the regime of integer and fractional quantum Hall effect. Nuclear spin-lattice relaxation time τ was measured from the time decay of the Overhauser ...
Added: December 11, 2020
Yu.V.Krasnikova, Furuya S. C., V.N.Glazkov et al., Physical Review Letters 2020 Vol. 125 No. 2 P. 027204-1-027204-6
We report low temperature electron spin resonance experimental and theoretical studies of an archetype S=1/2 strong-rung spin ladder material (C5H12N)2CuBr4. Unexpected dynamics is detected deep in the Tomonaga-Luttinger spin liquid regime. Close to the point where the system is half-magnetized (and believed to be equivalent to a gapless easy plane chain in zero field) we ...
Added: September 6, 2020
Shchepetilnikov A., Khisameeva A., Nefyodov Y. A. et al., Письма в Журнал экспериментальной и теоретической физики 2019 Т. 110 № 9 С. 599-602
The microwave-induced photovoltage in two-dimensional electron systems in an AlAs quantum well and a ZnO/MgZnO heterojunction under the conditions of the quantum Hall effect is investigated. When the magnetic field is varied smoothly at a fixed microwave frequency, a sharp peak corresponding to the spin resonance of two-dimensional conduction electrons occurs in the recorded photovoltage. ...
Added: December 11, 2020