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Raman Scattering at Phase Transformations in the Relaxor Ferroelectric PbCo1/3Nb2/3O3 弛豫铁电PbCo1/3Nb2/3O3相变中的拉曼散射
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S0021364025606189
N. K. Derets, A. I. Fedoseev, J.-H. Ko, S. G. Lushnikov
{"title":"Raman Scattering at Phase Transformations in the Relaxor Ferroelectric PbCo1/3Nb2/3O3","authors":"N. K. Derets,&nbsp;A. I. Fedoseev,&nbsp;J.-H. Ko,&nbsp;S. G. Lushnikov","doi":"10.1134/S0021364025606189","DOIUrl":"10.1134/S0021364025606189","url":null,"abstract":"<p>In this paper, we present the results of studies of the phonon and relaxation subsystems in the relaxor ferroelectric crystal PbCo<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> (PCN) using Raman scattering in the temperature range from 650 to 80 K, including the regions of “diffuse phase transition” with a maximum permittivity <span>({{T}_{m}} approx 250{kern 1pt} )</span> K at a frequency of 1 kHz and charge phase separation in the vicinity of 170 K. It has been shown that the polarized spectra of PCN are similar to those observed in relaxor ferroelectrics with a perovskite structure. The analysis of the temperature behavior of the main phonon modes and anisotropic quasielastic light scattering revealed anomalies in the region corresponding to the onset (<span>({{T}_{2}} sim 230{kern 1pt} )</span> K) and final formation (<span>({{T}_{3}} sim 170{kern 1pt} )</span> K) of charge phase separation, determined by the presence of Co<sup>2+</sup> and Co<sup>3+</sup> ions in the PCN crystal. Anomalies in the evolution of the Raman spectra near the temperature of the relative permittivity maximum <span>({{T}_{m}})</span>, which are characteristic of relaxor ferroelectrics, were not observed in PCN. The dynamics of polar nanoregions, which determine the behavior of quasielastic light scattering, differ from those observed in the model relaxor ferroelectric PbMg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> (PMN).</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"909 - 915"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606189.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171206","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
Binary Acidic/Alkaline Aqueous Electrolytes 二元酸性/碱性水溶液电解质
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S002136402560627X
V. Shikin
{"title":"Binary Acidic/Alkaline Aqueous Electrolytes","authors":"V. Shikin","doi":"10.1134/S002136402560627X","DOIUrl":"10.1134/S002136402560627X","url":null,"abstract":"<p>The properties of dilute, compensated “weak” electrolytes on the example of the binary mixture “acid + alkali + water” have been discussed within the framework of phenomenological energy statistics. The concepts of weak donors and acceptors have been consistently defined at the energy level. A natural criterion of donor–acceptor agreement has been formulated by analyzing tabular data on the dissociation constants <i>K</i><sub>d</sub>(<i>T</i>) and <i>K</i><sub>a</sub>(<i>T</i>) in Ostwald’s dilution law for weak acids and alkalis (these constants are defined below). The fundamental role of the existence and possibilities of observing the compensation effect in binary electrolytes in determining the main energy parameters of phenomenological statistics of dilute weak hosts is emphasized.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"942 - 949"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical Study of the Spin Polarization and Magnetic Properties of (Co,Fe)/MgO Thin Film Heterostructures （Co,Fe）/MgO薄膜异质结构自旋极化和磁性能的理论研究
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S0021364025606505
A. O. Shorikov, N. A. Viglin
{"title":"Theoretical Study of the Spin Polarization and Magnetic Properties of (Co,Fe)/MgO Thin Film Heterostructures","authors":"A. O. Shorikov,&nbsp;N. A. Viglin","doi":"10.1134/S0021364025606505","DOIUrl":"10.1134/S0021364025606505","url":null,"abstract":"<p>The electronic structure and magnetic properties of thin-film (Co,Fe)/MgO heterostructures have been examined using the GGA + <i>U</i> method. It has been found that the epitaxial strain in the Co layer leads to the antiferromagnetic order, which can deteriorate the polarization characteristics of the (Co, Fe)/MgO interface. The simulation of the extension of bcc Co lattice has shown that the change in the long-range order from ferromagnetic to antiferromagnetic can be caused by an increase in the interatomic distance.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"916 - 920"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606505.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171623","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
Structural Studies of 2 × 2-(Bi,Mg) Reconstruction on the Si(111) Surface Si（111）表面2 × 2-(Bi,Mg)重构的结构研究
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S0021364024605426
M. V. Ryzhkova, S. G. Azatyan, N. V. Denisov, D. A. Tsukanov
{"title":"Structural Studies of 2 × 2-(Bi,Mg) Reconstruction on the Si(111) Surface","authors":"M. V. Ryzhkova,&nbsp;S. G. Azatyan,&nbsp;N. V. Denisov,&nbsp;D. A. Tsukanov","doi":"10.1134/S0021364024605426","DOIUrl":"10.1134/S0021364024605426","url":null,"abstract":"<p>To study the crystal structure of the Si(111) 2 × 2-(Bi,Mg) surface reconstruction, formed during the adsorption of magnesium on the Si(111) <span>(sqrt 3 times sqrt 3 )</span>-Bi surface phase, ab initio calculations have been performed. The stoichiometric composition of the unit cell of the 2 × 2 surface reconstruction has been determined. Using the calculated formation energies, the most stable structures for the two-dimensional Bi<span>(_{X})</span>Mg<span>(_{Y})</span> alloy have been identified. It has been shown that the structural model with the configuration <span>(X = 2)</span> and <span>(Y = 4)</span> is in good agreement with the low-energy electron diffraction and scanning tunneling microscopy results observed for the reconstructed Si(111) 2 × 2-(Bi,Mg) surface.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"895 - 901"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024605426.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171194","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
Dynamics of a Nanoparticle in an Optical Trap Formed by a Photonic Jet Modulated by a Standing Wave in a Microfluidic Channel 微流控通道中驻波调制光子射流形成的光阱中纳米粒子的动力学
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S0021364025606414
D. V. Novitsky, O. V. Minin, I. V. Minin
{"title":"Dynamics of a Nanoparticle in an Optical Trap Formed by a Photonic Jet Modulated by a Standing Wave in a Microfluidic Channel","authors":"D. V. Novitsky,&nbsp;O. V. Minin,&nbsp;I. V. Minin","doi":"10.1134/S0021364025606414","DOIUrl":"10.1134/S0021364025606414","url":null,"abstract":"<p>A mathematical model has been proposed for an optical trap, in which a nanoparticle is captured by the field of a standing wave formed upon reflection of a photon jet from a dielectric surface. The equations of motion for the nanoparticle under the action of a trap field in the presence of viscous friction in the medium (liquid) have been formulated. The conditions for stable capture of a nanoparticle in the trap have been estimated analytically. The role of friction in the stability of the trap has been analyzed by numerically solving the equations of motion.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"883 - 889"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606414.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171207","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
Thermally Stable Ferroelectric HfO2:Al2O3 (10:1) in Silicon-on-Insulator and Silicon-on-Sapphire Heterostructures after Rapid Thermal Annealing Treatments and Oxidation-Induced Silicon Thinning 快速热退火处理和氧化诱导硅薄化后绝缘体上硅和蓝宝石上硅异质结构中热稳定的铁电HfO2:Al2O3 (10:1
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-31 DOI: 10.1134/S0021364025606359
V. P. Popov, V. A. Antonov, V. E. Zhilitskii, A. A. Lomov, A. V. Miakonkikh, K. V. Rudenko
{"title":"Thermally Stable Ferroelectric HfO2:Al2O3 (10:1) in Silicon-on-Insulator and Silicon-on-Sapphire Heterostructures after Rapid Thermal Annealing Treatments and Oxidation-Induced Silicon Thinning","authors":"V. P. Popov,&nbsp;V. A. Antonov,&nbsp;V. E. Zhilitskii,&nbsp;A. A. Lomov,&nbsp;A. V. Miakonkikh,&nbsp;K. V. Rudenko","doi":"10.1134/S0021364025606359","DOIUrl":"10.1134/S0021364025606359","url":null,"abstract":"<p>Grazing incidence X-ray diffraction (GIXRD) data have indicated that the orthorhombic <span>(Pmn{{2}_{1}})</span> phase previously detected in a 10–20 nm buried ferroelectric HfO<sub>2</sub>:Al<sub>2</sub>O<sub>3</sub> (10:1) layer of silicon-on-insulator and silicon-on-sapphire structures after annealing at <span>(T &gt; 950)</span>°C for 1 h is absent after 30 s stepwise rapid thermal annealing treatments. Instead, stressed textured ferroelectric layers thermally stable up to 1000°C are formed with the {111} and {002} orientations for silicon and sapphire substrates, respectively, in the rhombohedral r<span>(R3)</span> or orthorhombic <span>(Pca{{2}_{1}})</span> phases, which are not manifested in GIXRD patterns. The high remnant polarization in silicon-on-insulator structures indicates that the rhombohedral r<span>(R3)</span> phase is favorable.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 12","pages":"902 - 908"},"PeriodicalIF":1.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","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
Analysis of the Astrophysical 30Si(n, γ)31Si Reaction via the Asymptotic Normalization Coefficient Method 天体物理30Si(n, γ)31Si反应的渐近归一化系数法分析
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2025-07-25 DOI: 10.1134/S0021364025605883
A. I. Kilic
{"title":"Analysis of the Astrophysical 30Si(n, γ)31Si Reaction via the Asymptotic Normalization Coefficient Method","authors":"A. I. Kilic","doi":"10.1134/S0021364025605883","DOIUrl":"10.1134/S0021364025605883","url":null,"abstract":"<p>This study investigates the <sup>30</sup>Si(<i>n</i>, γ)<sup>31</sup>Si astrophysical reaction using the asymptotic normalization coefficient (ANC) method. The squared neutron asymptotic normalization coefficients (ANCs), for the virtual decay <sup>31</sup>Si <span>( to )</span> <sup>30</sup>Si + <i>n</i> are extracted by reanalyzing the existing angular distributions of the <sup>30</sup>Si(<i>d</i>, <i>p</i>)<sup>31</sup>Si reaction at 12.5 MeV. Both the distorted wave born approximation (DWBA) and adiabatic distorted wave approximation (ADWA) models are applied to refine the analysis. The results show improved ANC values compared to previous DWBA calculations. The squared neutron asymptotic normalization coefficient (ANC), for the ground state is found to be (<span>(32.49 pm 6)</span>) fm<sup>–1</sup> with DWBA and (<span>(31.45 pm 6)</span>) fm<sup>–1</sup> with ADWA. Additionally, the direct capture (DC) reaction rate was calculated and compared with previous work. The results show good agreement with the literature, with minor deviations at higher temperatures, highlighting the importance of the DC process in the <sup>30</sup>Si(<i>n</i>, γ)<sup>31</sup>Si reaction. This work emphasizes the crucial role of neutron capture reactions in the formation of the weak <span>(s)</span>-process component in stars and provides new insights into reaction rates and cross sections.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 3","pages":"133 - 140"},"PeriodicalIF":1.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025605883.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037188","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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