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L. A. Prozorova S. S. Sosin D. V. Efremov S. V. Petrov 《Journal of Experimental and Theoretical Physics》1997,85(5):1035-1038
The lower branch of the resonance spectrum of the quasi-one-dimensional triangular antiferromagnetic CsMnI3 has been investigated experimentally. This branch possesses a gap due to the dynamic hyperfine interaction. The temperature
dependence of the energy gap was studied in detail at several frequencies. A theoretical calculation of the corresponding
spectrum of coupled electron-nuclear spin oscillations was performed in the “hydrodynamic approximation” with an empirical
correction for thermal fluctuations of the antiferromagnetic system. The good agreement between the calculation and experimental
data makes it possible to determine the zero-point spin reduction in the antiferromagnetic.
Zh. éksp. Teor. Fiz. 112, 1893–1898 (November 1997) 相似文献
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Z. Sosin R. Płaneta T. Ciszek J. Brzychczyk W. Gawlikowicz K. Grotowski S. Micek P. Pawłowski A. Wieloch A.J. Cole D. Benchekroun E. Bisquer A. Chabane M. Charvet B. Cheynis A. Demeyer P. Désesquelles E. Gerlic A. Giorni D. Guinet D. Heuer P. Lautesse L. Lebreton A. Lléres M. Stern L. Vagneron J.B. Viano 《The European Physical Journal A - Hadrons and Nuclei》2001,11(3):305-310
The shape of the velocity distributions of charged particles projected on the beam direction can be explained if emissions
from the hot projectile-like fragment and the target-like fragment are supplemented by an emission from an intermediate velocity
source located between them. The creation of this source is predicted by a two-stage reaction model where, in the second stage,
some of the nucleons identified in the first stage as participants form a group of clusters located in the region between
the colliding nuclei. The cluster coalescence process is governed on the average by the maximum value of entropy, although
its fluctuations are also significant. The properties of the intermediate velocity source are precisely described, including
the isotopic composition of the emitted particles.
Received: 12 March 2001 / Accepted: 20 June 2001 相似文献
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A. I. Pankrats G. A. Petrakovskii M. A. Popov K. A. Sablina L. A. Prozorova S. S. Sosin G. Szimczak R. Szimczak M. Baran 《JETP Letters》2003,78(9):569-573
The static and resonance properties of copper metaborate CuB2O4 were experimentally studied in a magnetic field applied in the crystal tetragonal plane. The field-induced second-order phase transition to a weakly ferromagnetic state was observed in the temperature range 10–20 K. The low-field state is characterized by the absence of spontaneous moment, and it represents, presumably, a long-period helicoid. At temperatures below 2 K, two sequential first-order phase transitions were observed. They were accompanied by jumps in resonance absorption with a hysteresis upon changing field-scan direction. These transitions can be caused by the transformation of the incommensurate spin structure into the helicoidal states with periods commensurate with the lattice translation period. 相似文献
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The electron spin resonance is studied for noncollinear low-dimensional antiferromagnets RbMnBr3 and RbFe(MoO4)2 in a wide range of frequencies and fields. Both compounds have incommensurate spin structures appearing due to a low-symmetry distortion of an ideal hexagonal crystal lattice. Magnetic field applied in the spin plane induces a first-order transition into the commensurate phase. The low-energy resonance branch corresponding to a uniform oscillation of the spin system in the easy plane is observed in the two compounds in both incommensurate and commensurate phases, with a dramatic change of the spectra taking place near the transition field. The resonance spectrum of a nearly commensurate spin structure with long-wave modulations is analyzed in clean and dirty limits in the framework of a hydrodynamic approach. The resonance branch with steep field dependence in the incommensurate state is attributed to the acoustic mode with the gap resulted from pinning of local domain walls (discommensurations) on defects of the crystal structure. 相似文献
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Sosin S. S. Iafarova A. F. Romanova I. V. Morozov O. A. Korableva S. L. Batulin R. G. Zhitomirsky M. Glazkov V. N. 《JETP Letters》2022,116(11):771-778
JETP Letters - Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY1 ?xGdxF4 with low $$x = 0.005$$ and moderate $$x = 0.05$$... 相似文献
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R. Płaneta W. Gawlikowicz A. Wieloch J. Brzychczyk T. Ciszek A.J. Cole P. Désesquelles K. Grotowski P. Hachaj S. Micek P. Pawłowski Z. Sosin D. Benchekroun E. Bisquer A. Chabane M. Charvet B. Cheynis A. Demeyer E. Gerlic A. Giorni D. Guinet D. Heuer P. Lautesse L. Lebreton A. Lléres M. Stern L. Vagneron J.B. Viano 《The European Physical Journal A - Hadrons and Nuclei》2001,11(3):297-304
The creation of hot Ca-like fragments was investigated in the 40Ca + 40Ca reaction at 35 AMeV. Using the AMPHORA 4π detector system, the primary projectile-like fragment was reconstructed and its
properties were determined. Both primary and secondary distributions are compared with the predictions of a Monte Carlo code
describing a heavy-ion collision as a two-step process. Some of the nucleons which are identified as participants in the first
step are transferred in the second step to these final states, which correspond on the average to the maximum value of entropy
(thermodynamic probability). The model allows for competition between mean-field effects and nucleon-nucleon interactions
in the overlap zone of the interacting nuclei. The analysis presented here suggests a thermalized source picture of the decay
of the projectile-like fragment. The validity of the reconstruction procedure for projectile-like fragments is discussed.
Received: 12 March 2001 / Accepted: 20 June 2001 相似文献
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A. Sosin 《辐射效应与固体损伤》2013,168(4):267-271
Abstract The time dependence of frequency recovery at 306 K of pulse-irradiated quartz is analyzed and shown to be inconsistent with the diffusion of a specie in three dimensions, but follows well diffusion in one dimension. The main feature which distinguishes these cases is a t ?1/2 time dependence of the recovery. No extended region for a t ?1/2 dependence is possible in three-dimensional diffusion. An extensive t ?1/2 dependence is predicted in one-dimensional diffusion, paralleling the observation that this holds for some three decades in time and over 80% of the recovery. Having established one-dimensional diffusion in frequency recovery, it is shown that acoustic relaxation found at 115 K and a long time component of conductivity recovery found near 300 K, as well as the frequency recovery, all appear to originate in a common mechanism—the diffusion of H+ in one dimension with an activation of approximately ¼ electron volt. 相似文献
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A complete diffusional analysis of the low temperature, ID-IE post-irradiation recovery stages in copper is presented here. In applying this analysis to experiments, intrinsic defect characteristics are deduced by multi-parameter, minimum deviation fitting. The vacancy capture radius for interstitials is found to be 3.2 ± 0.3 lattice constants, for example. In addition, the shape of the initial interstitial-vacancy separation distribution function has been determined. A single distribution function describes this distribution for irradiation by electrons with energies greater than 0.6 MeV. At lower energies, the function is narrowed. 相似文献