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Exchange Bias in a Ferrihydrite Nanoparticle System: The Role of a Common Integrated Surface for a Conglomerate (Cluster) of Nanoparticles 水合铁纳米颗粒系统中的交换偏置：纳米颗粒砾石（簇）的共同集成表面的作用
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-08-19 DOI: 10.1134/S0021364025607353
D. A. Balaev, A. A. Krasikov, S. A. Skorobogatov, S. V. Stolyar, R. N. Yaroslavtsev, R. S. Iskhakov
{"title":"Exchange Bias in a Ferrihydrite Nanoparticle System: The Role of a Common Integrated Surface for a Conglomerate (Cluster) of Nanoparticles","authors":"D. A. Balaev,&nbsp;A. A. Krasikov,&nbsp;S. A. Skorobogatov,&nbsp;S. V. Stolyar,&nbsp;R. N. Yaroslavtsev,&nbsp;R. S. Iskhakov","doi":"10.1134/S0021364025607353","DOIUrl":"10.1134/S0021364025607353","url":null,"abstract":"<p>Magnetic hysteresis loops of two representative samples of synthetic ferrihydrite nanoparticles with the same sizes (the average size of <span>( approx )</span>2.7 nm) and various interparticle distances have been studied under cooling conditions in the presence and absence of an external field. One initial sample is characterized by the aggregation of nanoparticles, and a shift in the magnetic hysteresis loop along the abscissa axis is observed after cooling from a temperature exceeding the superparamagnetic blocking temperature in the external field. The particles in another sample are spatially separated by coating their surface with an arabinogalactan layer, and the shift of the hysteresis loop after cooling in the external field is not observed in this sample. This experimental fact indicates that one of the important factors determining the shift of the hysteresis loop of nanoparticle systems is a pronounced subsystem of surface spins formed during the close contact of particles, which can be considered as a kind of the surface effect. Because of the exchange coupling between the subsystem of surface spins (common for a conglomerate of particles) and uncompensated moments of particles, an additional source of the unidirectional magnetic anisotropy arises during cooling in the external field, which is the origin of the observed exchange bias of the magnetic hysteresis loop.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"48 - 54"},"PeriodicalIF":1.3,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607353.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of the Stark Interaction in the Dynamics of an Atomic System in a Broadband Squeezed Electromagnetic Field 宽带压缩电磁场中原子系统动力学中Stark相互作用的影响
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-08-19 DOI: 10.1134/S002136402560675X
A. I. Trubilko, A. M. Basharov
{"title":"Effects of the Stark Interaction in the Dynamics of an Atomic System in a Broadband Squeezed Electromagnetic Field","authors":"A. I. Trubilko,&nbsp;A. M. Basharov","doi":"10.1134/S002136402560675X","DOIUrl":"10.1134/S002136402560675X","url":null,"abstract":"<p>The effects of the Stark interaction in the collective radiation of an ensemble of atoms in the field of a broadband electromagnetic field in a squeezed quantum state have been considered. It has been shown that the inclusion of the conditions for the formation of the squeezed field allows one to describe the dynamics of atoms in terms of random quantum creating, annihilating, and counting processes. The latter process is the Stark interaction of atoms and the field and manifests itself in the form of a trigger superradiance pulse generated by an ensemble of identical atoms excited by a quantized resonant squeezed electromagnetic field. The description is based on the kinetic equation derived for an open localized quantum system in a broadband squeezed quantized electromagnetic field. The resulting equation differs from the known ones, but agrees with them in particular and limiting cases.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"22 - 31"},"PeriodicalIF":1.3,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402560675X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Statistical Models of Barren Plateaus and Anti-Concentration of Pauli Observables 贫瘠高原统计模型与泡利观测值的反集中
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-25 DOI: 10.1134/S0021364025607511
N. A. Nemkov
{"title":"Statistical Models of Barren Plateaus and Anti-Concentration of Pauli Observables","authors":"N. A. Nemkov","doi":"10.1134/S0021364025607511","DOIUrl":"10.1134/S0021364025607511","url":null,"abstract":"<p>We introduce statistical models for each of the three main sources of barren plateaus: nonlocality of the observable, entanglement of the initial state, and circuit expressivity. For instance, non-local observables are modeled by random Pauli operators, which lead to barren plateaus with probability exponentially close to one. These models are complementary to the conventional deterministic ones, and often simpler to analyze. Using this framework, we show that in the barren plateau regime any two Pauli observables are anti-concentrated with high probability in the following sense. While each of the observables is localized in an exponentially small parameter subspace, these regions are essentially independent, so that their overlap is yet exponentially smaller than each subspace. This invites to rethink the structure of quantum landscapes with barren plateaus and approaches to their optimization, including warm-start strategies.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"190 - 196"},"PeriodicalIF":1.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607511.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Coulomb Correlations on the Electronic Structure of Bulk V2Se2O: a DFT + DMFT Study 库仑相关对体V2Se2O电子结构的影响：DFT + DMFT研究
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-25 DOI: 10.1134/S0021364025607328
I. O. Trifonov, S. L. Skornyakov, V. I. Anisimov
{"title":"Effect of Coulomb Correlations on the Electronic Structure of Bulk V2Se2O: a DFT + DMFT Study","authors":"I. O. Trifonov,&nbsp;S. L. Skornyakov,&nbsp;V. I. Anisimov","doi":"10.1134/S0021364025607328","DOIUrl":"10.1134/S0021364025607328","url":null,"abstract":"<p>We present results of density functional theory (DFT) plus dynamical mean-field theory (DFT + DMFT) calculations of the electronic structure of bulk paramagnetic V<sub>2</sub>Se<sub>2</sub>O. We show that local Coulomb correlations in the partially filled V <span>(3d)</span> shells induce renormalizations of the DFT spectral functions close to the Fermi energy preserving their shape. These transformations are not accompanied by a spectral weight transfer to Hubbard bands, indicating a moderately correlated metallic state of bulk paramagnetic V<sub>2</sub>Se<sub>2</sub>O. The V <span>(3d)</span> states exhibit a quasiparticle mass enhancement <span>(m{text{*/}}m sim 1.34{-} 3.11)</span> comparable to that in the isostructural compound V<sub>2</sub>Te<sub>2</sub>O. We demonstrate that orbital selectivity of correlation effects in V<sub>2</sub>Se<sub>2</sub>O is less pronounced compared to V<sub>2</sub>Te<sub>2</sub>O as can be traced from the weaker differentiation of <span>(m{text{*/}}m)</span> and local spin correlation functions for different V <span>(3d)</span> orbitals. The analysis of the temperature dependence of the self-energy allows us to speculate on possible deviations from the Fermi-liquid behavior of V<sub>2</sub>Se<sub>2</sub>O.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"171 - 177"},"PeriodicalIF":1.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607328.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Does the Existence of the f0 Meson Increase the K+ → π0π0π0e+ν Decay Probability? f0介子的存在会增加K+→π0π0π e+ν的衰变概率吗？
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-25 DOI: 10.1134/S0021364025607481
E. K. Karkaryan, V. F. Obraztsov, M. I. Vysotsky
{"title":"Does the Existence of the f0 Meson Increase the K+ → π0π0π0e+ν Decay Probability?","authors":"E. K. Karkaryan,&nbsp;V. F. Obraztsov,&nbsp;M. I. Vysotsky","doi":"10.1134/S0021364025607481","DOIUrl":"10.1134/S0021364025607481","url":null,"abstract":"<p>We estimate a possible contribution of the two-pion system <span>({{f}_{0}}(500))</span> wide resonance to the decay probability of the super rare decay <span>({{K}^{ + }} to 3{{pi }^{0}}{{e}^{ + }}nu )</span>. We vary the width of the resonance from 0.01 to 1000 MeV. We found that the contribution of the narrow resonance in a system of several final state particles into the decay probability is proportional to its width. However it never exceeds the value of the decay probability calculated on free final state particles neglecting the resonance contribution.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"141 - 143"},"PeriodicalIF":1.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607481.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of Spiral Waves in Simplified Cardiac Tissue Models 简化心脏组织模型中螺旋波的比较
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-15 DOI: 10.1134/S0021364025600053
S. Mohanty, D. Prusty, A. R. Nayak
{"title":"Comparison of Spiral Waves in Simplified Cardiac Tissue Models","authors":"S. Mohanty,&nbsp;D. Prusty,&nbsp;A. R. Nayak","doi":"10.1134/S0021364025600053","DOIUrl":"10.1134/S0021364025600053","url":null,"abstract":"<p>Spiral waves of electrical activation in cardiac tissue can lead to life-threatening arrhythmias; therefore, understanding the mechanisms underlying the formation and propagation of spiral waves is of great interest in cardiac dynamics. In this study, we conduct a comparative analysis of spiral waves using two simplified component models for cardiac tissue: (a) the Panfilov model and (b) the Aliev–Panfilov model, by varying the parameters that govern excitability and recovery in both models. From our numerical studies, we observe states of (i) a periodic spiral, (ii) a quasi-periodic spiral, and (iii) spiral turbulence in both models, depending on the parameters. Our systematic study reveals that the Panfilov model exhibits conduction velocity restitution behavior and spiral transition sequences that closely resemble those observed in biophysical models; thus, it is better suited for studying wave dynamics in cardiac tissue compared to the Aliev–Panfilov model, providing an alternative to computationally expensive cardiac tissue models.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"121 - 131"},"PeriodicalIF":1.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025600053.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nuclear Magnetic Resonance Evidence for a Pseudogap in a Pb-Doped Bi:2201 Single Crystal 掺铅Bi:2201单晶赝隙的核磁共振证据
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-15 DOI: 10.1134/S0021364025607109
O. M. Vyaselev
{"title":"Nuclear Magnetic Resonance Evidence for a Pseudogap in a Pb-Doped Bi:2201 Single Crystal","authors":"O. M. Vyaselev","doi":"10.1134/S0021364025607109","DOIUrl":"10.1134/S0021364025607109","url":null,"abstract":"<p>A <sup>63</sup>Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2.05</sub>CuO<sub><i>y</i></sub>, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near <span>(T{text{*}} = 60)</span> K, significantly above the superconducting critical temperature <span>({{T}_{{text{c}}}} simeq 9 )</span> K at the NMR experiment field, 7 T oriented <b>H</b> || <i>c</i>. The noticeable disparity between <i>T</i><sub>c</sub> and <i>T</i> * and the behavior of Cu SLR at <span>(T &gt; T{text{*}})</span> imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (<span>( approx )</span>7 K) shift of the zero-field <i>T</i><sub>c0</sub> = (16 ± 1) K under the applied 7 T field suggests high upper critical field, <i>H</i><sub>c2</sub>, unusual for compounds with as low <i>T</i><sub>c0</sub>.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"92 - 96"},"PeriodicalIF":1.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607109.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of the Intergranular Transparency of Diffusive Superconducting Films from the Shape of the Density of States of the Abrikosov Vortex 从Abrikosov涡的态密度形状估计扩散超导膜的晶间透明度
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-15 DOI: 10.1134/S0021364025607419
M. M. Khapaev, M. Yu. Kupriyanov, A. A. Golubov, V. S. Stolyarov
{"title":"Estimation of the Intergranular Transparency of Diffusive Superconducting Films from the Shape of the Density of States of the Abrikosov Vortex","authors":"M. M. Khapaev,&nbsp;M. Yu. Kupriyanov,&nbsp;A. A. Golubov,&nbsp;V. S. Stolyarov","doi":"10.1134/S0021364025607419","DOIUrl":"10.1134/S0021364025607419","url":null,"abstract":"<p>A technique has been developed for the evaluation of the transparency of grain boundaries in polycrystalline superconducting films. The model is founded upon a numerical algorithm for calculating the density of states of an Abrikosov vortex located in the center of a cylindrical granule, separated from the main superconducting matrix by a boundary with finite transparency. The present study calculates the dependences of the gap difference in the density of states on both sides of the boundary and uses this difference to estimate the transparency of the interface.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"116 - 120"},"PeriodicalIF":1.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607419.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Lateral Plasmonic Superlattice in Strongly Dissipative Regime 强耗散状态下的横向等离子体超晶格
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-30 DOI: 10.1134/S0021364024604081
I. V. Gorbenko, V. Yu. Kachorovskii
{"title":"Lateral Plasmonic Superlattice in Strongly Dissipative Regime","authors":"I. V. Gorbenko,&nbsp;V. Yu. Kachorovskii","doi":"10.1134/S0021364024604081","DOIUrl":"10.1134/S0021364024604081","url":null,"abstract":"<p>We study transmission of terahertz radiation through lateral plasmonic superlattice with a unit cell consisting of two regions with different plasma wave velocities, <span>({{s}_{1}})</span> and <span>({{s}_{2}})</span> (<span>({{s}_{1}} &gt; {{s}_{2}})</span>). We generalize theory, developed earlier for resonant case, to the non-resonant regime, assuming that the scattering rate, <span>(gamma ,)</span> is large compared to fundamental gate-tunable frequencies <span>({{omega }_{{1,2}}})</span> of plasma oscillations in both regions. We describe evolution of transmission coefficient, <span>(mathcal{T},)</span> with increasing of radiation frequency, identify several dissipation regimes, construct general diagram describing all these regimes, and find corresponding analytical expressions for <span>(mathcal{T}.)</span> Most importantly, <span>(mathcal{T})</span> sharply depends on the gate voltages, which control velocities <span>({{s}_{{1,2}}})</span>, and on frequency. In particular, for <span>({{omega }_{2}} ll {{omega }_{1}})</span> transmission <span>(mathcal{T})</span> strongly varies on very small frequency scale, <span>(delta omega ll gamma ,)</span> determined by the Maxwell relaxation, <span>(delta omega sim omega _{1}^{2}{text{/}}gamma ,)</span> so that the superlattice shows very high responsivity within the narrow frequency interval. Unexpected appearance of a narrow peak deep in the non-resonant regime is a universal phenomenon and can also be observed in a number of other photoelectric effects.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"55 - 64"},"PeriodicalIF":1.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604081.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonreciprocal Waves in Two-Dimensional Electron Systems with Temperature Gradient 具有温度梯度的二维电子系统中的非互易波
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-06-30 DOI: 10.1134/S0021364025606463
A. S. Petrov
{"title":"Nonreciprocal Waves in Two-Dimensional Electron Systems with Temperature Gradient","authors":"A. S. Petrov","doi":"10.1134/S0021364025606463","DOIUrl":"10.1134/S0021364025606463","url":null,"abstract":"<p>We demonstrate that the interaction of dc temperature gradient with ac magnetic field in temperature-biased two-dimensional electron systems leads to formation of a new electromagnetic mode, a two-dimensional thermomagnetic wave (2D TMW). This wave is transverse electric and nonreciprocal, and its damping rate can be lower than that of conventional 2D plasma waves. The <span>(Q)</span>-factor of 2D TMW is independent of the wave vector. Numerical estimates show that in state-of-the-art two-dimensional electrons systems the 2D TMW <span>(Q)</span>-factor is the order of 10<sup>–3</sup>. We discuss possible ways to overcome this issue.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 1","pages":"39 - 43"},"PeriodicalIF":1.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606463.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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