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Bulletin of the Russian Academy of Sciences: Physics最新文献

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Effect of Vacuum Heat Treatment on Magnetic Ordering in Substituted Orthoferrite La1 – xSrxFeO3 – δ 真空热处理对取代的正交铁氧体La1 - xSrxFeO3 - δ磁有序的影响
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708663
M. S. Dmitrieva, A. I. Dmitriev, V. D. Sedykh
{"title":"Effect of Vacuum Heat Treatment on Magnetic Ordering in Substituted Orthoferrite La1 – xSrxFeO3 – δ","authors":"M. S. Dmitrieva,&nbsp;A. I. Dmitriev,&nbsp;V. D. Sedykh","doi":"10.1134/S1062873824708663","DOIUrl":"10.1134/S1062873824708663","url":null,"abstract":"<p>The temperature dependences of the magnetization of La<sub>1 –</sub> <sub><i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3 – δ</sub> samples (<i>x</i> = 0.33, 0.50, and 0.67) have been studied. Their Neel temperatures <i>T</i><sub>N</sub> have been determined, at which non-collinear antiferromagnetism (weak ferromagnetism) is settled down in the samples. The introduction of a substituting impurity of strontium into La<sub>1 –</sub> <sub><i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3 – δ</sub> and an increase in its content results in a considerable decrease in <i>T</i><sub>N</sub>. This effect can be compensated using vacuum heat treatment, upon which, on the contrary, a noticeable increase in <i>T</i><sub>N</sub> is observed.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"2046 - 2049"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical Spectroscopy of Oxygen Vacancies in Rutile (TiO2) Irradiated with Argon Ions 氩离子辐照金红石（TiO2）中氧空位的光谱学研究
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S106287382470864X
E. M. Begishev, A. G. Shmelev, D. K. Zharkov, V. V. Bazarov, N. M. Lyadov, V. F. Valeev, V. I. Nuzhdin, R. I. Khaibullin
{"title":"Optical Spectroscopy of Oxygen Vacancies in Rutile (TiO2) Irradiated with Argon Ions","authors":"E. M. Begishev,&nbsp;A. G. Shmelev,&nbsp;D. K. Zharkov,&nbsp;V. V. Bazarov,&nbsp;N. M. Lyadov,&nbsp;V. F. Valeev,&nbsp;V. I. Nuzhdin,&nbsp;R. I. Khaibullin","doi":"10.1134/S106287382470864X","DOIUrl":"10.1134/S106287382470864X","url":null,"abstract":"<p>Single-crystal (001) rutile plate was irradiated intensively with 40 keV argon ions. Then, electromigration of oxygen vacancies was done in the irradiated rutile. The effect the concentration and charge state of oxygen vacancies has on the color, optical absorption spectra, and photoluminescence of rutile is shown.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"2034 - 2041"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electron Paramagnetic Resonance of Gd3+ Ions in the Pb1 – x – yGdxCuyS Narrow-Gap Semiconductor: Effects of Resonance Transitions on Conductivity Pb1 - x - yGdxCuyS窄隙半导体中Gd3+离子的电子顺磁共振：共振跃迁对电导率的影响
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708493
V. A. Ulanov, R. R. Zainullin, I. V. Yatsyk, A. V. Shestakov, A. M. Sinitsyn
{"title":"Electron Paramagnetic Resonance of Gd3+ Ions in the Pb1 – x – yGdxCuyS Narrow-Gap Semiconductor: Effects of Resonance Transitions on Conductivity","authors":"V. A. Ulanov,&nbsp;R. R. Zainullin,&nbsp;I. V. Yatsyk,&nbsp;A. V. Shestakov,&nbsp;A. M. Sinitsyn","doi":"10.1134/S1062873824708493","DOIUrl":"10.1134/S1062873824708493","url":null,"abstract":"<p>Crystals of the narrow-band semiconductor Pb<sub>1 –</sub> <sub><i>x</i></sub> <sub>–</sub> <sub><i>y</i></sub>Gd<sub><i>x</i></sub>Cu<sub><i>y</i></sub>S (<i>x</i> = 1.1 × 10<sup>–3</sup>, <i>y</i> = 2.5 × 10<sup>–3</sup>) at temperatures <i>T</i> = 5–300 K demonstrated unusual dependences of the shape of the lines of the electron paramagnetic resonance (EPR) spectra of paramagnetic centers of Gd<sup>3+</sup> on temperature and microwave power in the resonator of EPR spectrometer. Analysis of the shape parameters of the resonance lines recorded in the X band showed that one of the causes of the unusual changes in the observed EPR spectra of Gd<sup>3+</sup> centers is a nonuniform distribution of the acceptor impurity of copper with the formation of regions with different concentrations of free charge carriers. Apparently, in these regions, resonance transitions between the spin states of Gd<sup>3+</sup> centers differently affect the kinetic characteristics of free charge carriers, which lead to different contributions to the quasi-resonant absorption of microwave power.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1938 - 1943"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of Allotropic Forms of Carbon in a Laser Experiment: 1D–3D Topological Configurations with Carbon Nanotubes and Diamond-Like Systems 激光实验中碳的同素异形体的合成：碳纳米管和类金刚石系统的一维-三维拓扑结构
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708638
K. S. Khorkov, D. N. Bukharov, Ya. V. Podoprigora, I. V. Burakova, A. E. Burakov, A. O. Kucherik, A. G. Tkachev, S. M. Arakelyan
{"title":"Synthesis of Allotropic Forms of Carbon in a Laser Experiment: 1D–3D Topological Configurations with Carbon Nanotubes and Diamond-Like Systems","authors":"K. S. Khorkov,&nbsp;D. N. Bukharov,&nbsp;Ya. V. Podoprigora,&nbsp;I. V. Burakova,&nbsp;A. E. Burakov,&nbsp;A. O. Kucherik,&nbsp;A. G. Tkachev,&nbsp;S. M. Arakelyan","doi":"10.1134/S1062873824708638","DOIUrl":"10.1134/S1062873824708638","url":null,"abstract":"<p>The problems of synthesis of various allotropic forms of carbon under a laser impact on a carbon-containing target under the conditions of nonequilibrium phase transitions have been considered. The results of studies of the processes of controlled design of certain topological configurations of metal-carbon and diamond-like compounds in a laser experiment with laser ablation and by modeling the 1D–3D structures with a modifyable fractal dimension have been presented. The measurements of the optical and electrophysical characteristics of such structures have been discussed in terms of the possibility of controlling their functional properties.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"2022 - 2033"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structure and Magnetic Properties of Impurity Complexes [NiF4F4Fint]6(C4v) in the BaF2 Crystal: EPR Study Data BaF2晶体中杂质配合物[NiF4F4Fint]6（C4v）的结构和磁性：EPR研究数据
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708481
V. A. Ulanov, I. V. Yatsyk, R. B. Zaripov, R. R. Zainullin, V. A. Golenishchev-Kutuzov
{"title":"Structure and Magnetic Properties of Impurity Complexes [NiF4F4Fint]6(C4v) in the BaF2 Crystal: EPR Study Data","authors":"V. A. Ulanov,&nbsp;I. V. Yatsyk,&nbsp;R. B. Zaripov,&nbsp;R. R. Zainullin,&nbsp;V. A. Golenishchev-Kutuzov","doi":"10.1134/S1062873824708481","DOIUrl":"10.1134/S1062873824708481","url":null,"abstract":"<p>Impurity paramagnetic complexes [NiF<sub>4</sub>F<sub>4</sub>F<sub>int</sub>]<sup>6–</sup>(<i>C</i><sub>4<i>v</i></sub>), stable associates of the trivalent nickel ion with the interstitial fluorine ion <span>({text{F}}_{{{text{int}}}}^{-})</span>, were synthesized in BaF<sub>2</sub> ionic crystals with the fluorite structure. The molecular structure of the synthesized complexes was studied by electron paramagnetic resonance at frequencies of 9.39 and 34.25 GHz in the temperature range from 5 to 250 K. It was shown that, in the studied complex, the Ni<sup>3+</sup> ion (3<i>d</i><sup>7</sup>, <sup>4</sup><i>F</i>, <i>S</i> = 3/2) replaces the lattice cation Ba<sup>2+</sup> but, under the influence of <span>({text{F}}_{{{text{int}}}}^{-})</span> in the neighboring interstice of the octahedral type, is shifted toward it from the center of the coordination cube occupied by it. Under the influence of the crystal field of tetragonal symmetry, the electron spin levels of the complex are split into two Kramers doublets, of which the ground state Kramers doublet turned out to be <span>(left| { pm 1.2} rightrangle )</span>. The energy interval between doublets is approximately 114 GHz. The EPR spectra exhibit a superhyperfine structure caused by the interactions of the electron spin moment of the nickel ion with the nuclei of nine ligand fluorine ions. The parameters of these interactions were determined.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1930 - 1937"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single Molecule Detection according to Plasmon-Enhanced Photoluminescence in CeYTbF3 Colloidal Nanoparticles 基于等离子体增强光致发光的CeYTbF3胶体纳米颗粒单分子检测
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708511
E. A. Izbasarova, A. R. Gazizov
{"title":"Single Molecule Detection according to Plasmon-Enhanced Photoluminescence in CeYTbF3 Colloidal Nanoparticles","authors":"E. A. Izbasarova,&nbsp;A. R. Gazizov","doi":"10.1134/S1062873824708511","DOIUrl":"10.1134/S1062873824708511","url":null,"abstract":"<p>This paper deals with the detection of molecules in a solution using luminescent nanoparticles. Plasmonic nanoparticles change their photoluminescence due to the Purcell and Förster effects, the latter leading to luminescence quenching. Modeling these effects in colloidal solution allows us to determine the conditions of amplification and quenching, which opens the way to improving the sensitivity of sensors based on photoluminescence.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1949 - 1955"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of an External Magnetic Field on the Current Density in a Photonic Crystal of Impurity Carbon Nanotubes under the Action of a Laser Pulse 外磁场对激光脉冲作用下杂质碳纳米管光子晶体电流密度的影响
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708444
Yu. V. Dvuzhilova, I. S. Dvuzhilov, Yu. V. Kistenev
{"title":"Influence of an External Magnetic Field on the Current Density in a Photonic Crystal of Impurity Carbon Nanotubes under the Action of a Laser Pulse","authors":"Yu. V. Dvuzhilova,&nbsp;I. S. Dvuzhilov,&nbsp;Yu. V. Kistenev","doi":"10.1134/S1062873824708444","DOIUrl":"10.1134/S1062873824708444","url":null,"abstract":"<p>A theoretical model was developed to describe the interaction of a photonic crystal of semiconductor carbon nanotubes and a three-dimensional extremely short laser pulse in the presence of an external magnetic field. Numerical modeling was used to construct the patterns of the time evolution of current density in a medium containing a multilevel impurity. The dependences of the shape of the current density on the external magnetic field and on the hopping integrals between impurity levels were determined.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1908 - 1912"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multimodal Upconversion Luminescence Temperature Sensors NaYF4:Yb,Er,Tm for Biological Applications 多模态上转换发光温度传感器NaYF4:Yb，Er,Tm
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708596
E. O. Mityushkin, A. G. Shmelev, A. V. Leontyev, L. A. Nurtdinova, D. K. Zharkov, V. G. Nikiforov
{"title":"Multimodal Upconversion Luminescence Temperature Sensors NaYF4:Yb,Er,Tm for Biological Applications","authors":"E. O. Mityushkin,&nbsp;A. G. Shmelev,&nbsp;A. V. Leontyev,&nbsp;L. A. Nurtdinova,&nbsp;D. K. Zharkov,&nbsp;V. G. Nikiforov","doi":"10.1134/S1062873824708596","DOIUrl":"10.1134/S1062873824708596","url":null,"abstract":"<p>NaYF<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup>/Tm<sup>3+</sup> particles are synthesized in the form of rods with dimensions of 0.21 × 0.77 μm. They exhibit upconversion luminescence in the visible and near-infrared spectral ranges when irradiated at a wavelength of 980 nm. The possibility of using them as multimodal luminescent sensors with temperatures in the range of 250–350 K is shown ratiometrically, based on the emergence of spectral bands at wavelengths of 525, 545, 655, 700, and 805 nm, of particular interest for biological applications.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1993 - 2001"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Schmidt Modes of Ultra-Broadband Biphotons Generated in a Photonic Crystal Fiber 光子晶体光纤中超宽带双光子的施密特模式分析
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S1062873824708535
M. A. Smirnov, A. M. Smirnova, A. F. Khairullin, O. A. Ermishev, S. A. Moiseev
{"title":"Analysis of Schmidt Modes of Ultra-Broadband Biphotons Generated in a Photonic Crystal Fiber","authors":"M. A. Smirnov,&nbsp;A. M. Smirnova,&nbsp;A. F. Khairullin,&nbsp;O. A. Ermishev,&nbsp;S. A. Moiseev","doi":"10.1134/S1062873824708535","DOIUrl":"10.1134/S1062873824708535","url":null,"abstract":"<p>We presented numerical estimates of the degree of quantum entanglement based on Schmidt mode analysis for ultra-broadband biphotonic states generated in a photonic crystal fiber. We show that these states have a high degree of quantum entanglement even when the source is pumped broadband by femtosecond laser pulses.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1961 - 1965"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes in the Raman Spectra from the Surface of Titanium Foils after Their Fluorination 钛箔氟化后表面拉曼光谱的变化
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI: 10.1134/S106287382470850X
P. B. Sergeev, N. N. Melnik
{"title":"Changes in the Raman Spectra from the Surface of Titanium Foils after Their Fluorination","authors":"P. B. Sergeev,&nbsp;N. N. Melnik","doi":"10.1134/S106287382470850X","DOIUrl":"10.1134/S106287382470850X","url":null,"abstract":"<p>The transformation of the Raman spectra from titanium foils after their fluorination in gas mixtures was experimentally studied. It was found that fluorination leads to a strong increase in the intensity of scattering bands from the initial components of the nanocoating of titanium foils. A new strong band at 905 ± 5 cm<sup>–1</sup> and a wide continuum with a maximum at ~1700 cm<sup>–1</sup> also appear and increase in intensity after fluorination.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 12","pages":"1944 - 1948"},"PeriodicalIF":0.48,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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