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Нестационарная фотоэдс в периодически поляризованном кристалле MgO : LiNbO-=SUB=-3-=/SUB=-
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.02.54291.519
М.А. Брюшинин, В. В. Куликов, И.А. Соколов, Е. Н. Савченков, Н. И. Буримов, С. М. Шандаров, А. Р. Ахматханов, М.А. Чувакова, В. Я. Шур
The diffusion mode of the non-steady-state photo-EMF excitation is investigated in periodically poled MgO:LiNbO₃ crystal at light wavelength λ=457 nm. The signal excitation is carried out along the polar axis of the crystal; the dependencies of the signal amplitude versus the phase modulation frequency, intensity and spatial frequency of the interference pattern are studied in this geometry. The analysis of these dependencies allows determining the photoelectric parameters of the material – the type, value and relaxation time of the photoconductivity, as well as the diffusion length of charge carriers.
研究了周期极化MgO:LiNbO₃晶体在波长λ=457 nm处的非稳态光- emf激发的扩散模式。信号激励沿晶体极轴方向进行;研究了信号幅值与相位调制频率、干涉图样的强度和空间频率的关系。通过对这些依赖关系的分析,可以确定材料的光电参数——光导率的类型、值和弛豫时间,以及载流子的扩散长度。
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引用次数: 0
Прецессионная динамика намагниченности одноосной наночастицы в области ферромагнитного резонанса 铁磁共振区域单轴纳米微粒磁化动力学
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.06.55664.56
А. М. Шутый, Т.М. Василевская, Дмитрий Игоревич Семенцов, С. В. Елисеева
The influence of the shape parameter (oblateness) of a uniaxial ellipsoidal nanoparticle on the dynamics of its magnetic moment upon magnetization along the symmetry axis and excitation by a weak transverse high-frequency field in the region of parameters where the equilibrium magnetic moment of the nanoparticle and the external static field is noncollinear has been studied. It is shown that as the oblateness increases, the irregularity of the oscillations increases, which at first affects only their amplitude, but then also the time dependence. The intervals of the shape parameter (or frequency), where various nonlinear modes of precession are realized - dynamic bistability, complex spatial attractors and chaos, were revealed using bifurcation diagrams.
研究了单轴椭球形纳米粒子的形状参数(扁率)对纳米粒子沿对称轴磁化和受弱横向高频场激励时的磁矩动力学特性的影响,其中纳米粒子的平衡磁矩与外静场非线性共线。结果表明,随着扁率的增加,振荡的不规则性增加,这首先只影响振幅,然后影响时间依赖性。利用分岔图揭示了实现各种非线性进动模式的形状参数(或频率)区间——动态双稳态、复杂空间吸引子和混沌。
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引用次数: 0
Проявление обменного взаимодействия электронов, разделенных потенциальным барьером в двойных квантовых ямах, в эффекте Керра 电子在双量子坑中被潜在屏障隔开的交换作用表现为克尔效应。
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.01.53927.478
М.М. Дегоев, Михаил Михайлович Афанасьев, В.К. Калевич, К. В. Кавокин, Н. В. Козырев, G. Karczewski, Юрий Георгиевич Кусраев
In tunnel-coupled quantum wells of different widths, it was found that the spin dynamics arising from resonant pulsed optical pumping of an exciton in the narrow well includes the dynamics of electron spin polarization in the wide well, although the electron level in the wide well is 55 meV lower than the electron level in the narrow well. An analysis of the obtained results showed that the observed effect is caused by the exchange interaction of spin-polarized electrons in the wide well with exciton states in the narrow well.
在不同宽度的隧道耦合量子阱中,虽然宽阱中的电子能级比窄阱中的电子能级低55 meV,但窄阱中激子共振脉冲光抽运产生的自旋动力学包含了宽阱中电子自旋极化的动力学。对所得结果的分析表明,所观察到的效应是由宽阱中的自旋极化电子与窄阱中的激子态交换相互作用引起的。
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引用次数: 0
Процессы переключения в керамике твердых растворов на основе Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=- 卡-= -= - 3-= - SUB - 7-= -2- 2-= -2- O-= -6-= - SUB -= - SUB
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.09.56250.166
О. С. Гусева, О. В. Малышкина
In this work, ceramic samples with a structure of the type of tetragonal tungsten bronzes, composition Са0.3Ba0.7Nb2O6 (CBN30) pure and with modifying additives SrTiO3, KTaO3 or LiTaO3 (5 mass %) were studied by the oscillographic method. It is shown that the introduction of modifying additives into CBN30 ceramics leads to an increase in the reversal polarization and to a decrease in dielectric losses, both at room temperature and at high temperatures. The introduction of LiTaO3 impurity into the CBN30 composition leads to the greatest increase in the reversal polarization. In contrast to ceramics based on lead zirconate titanate, which have a perovskite type structure, the introduction of SrTiO3 into CBN30 (having the structure of tetragonal tungsten bronzes) does not significantly improve the ferroelectric properties. It has been found that at temperatures above 100 °C for pure CBN30 ceramics, above 165 °C for CBN30 + 5% SrTiO3 and CBN30 + 5% KTaO3, and above 200 оС for CBN30 + 5% LiTaO3, there is a strong increase in dielectric losses. The contribution of dielectric losses to switching processes makes it impossible to determine the temperature of the ferroelectric phase transition for solid solutions based on CBN30 from the temperature dependences of dielectric hysteresis loops.
本文采用示波法研究了结构为四方钨青铜、成分为Са0.3Ba0.7Nb2O6 (CBN30)纯净、添加SrTiO3、KTaO3或LiTaO3(质量% 5)改性剂的陶瓷样品。结果表明,在CBN30陶瓷中加入改性添加剂,无论在室温还是高温下,都能提高陶瓷的反转极化,降低陶瓷的介电损耗。在CBN30成分中引入LiTaO3杂质后,反转极化的增加幅度最大。与具有钙钛矿型结构的锆钛酸铅陶瓷相比,将SrTiO3引入CBN30(具有四方钨青铜结构)并没有显著改善其铁电性能。研究发现,纯CBN30陶瓷在100℃以上,CBN30 + 5% SrTiO3和CBN30 + 5% KTaO3在165℃以上,CBN30 + 5% LiTaO3在200 оС以上时,介质损耗明显增加。介电损耗对开关过程的贡献使得基于CBN30的铁电相变温度无法从介电磁滞回线的温度依赖性来确定固溶体的铁电相变温度。
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引用次数: 0
Особенности плоскостной магнитной анизотропии и доменной структуры пленок FeNi, осажденных в присутствии магнитного поля различной конфигурации 芬尼薄膜的平面磁各向异性和域结构的特征,在不同配置的磁场下被包围。
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.06.55640.17h
А. В. Свалов, Вячеслав Элизбарович Иванов, C.В. Андреев, В. Н. Лепаловский, Андрей Фещенко, Е. В. Кудюков, И. А. Макарочкин, Г. В. Курляндская
FeNi films in circular shape with 3 mm in diameter obtained by magnetron sputtering in the presence of a constant magnetic field of various configurations are studied. The presence of a field created by a permanent magnet with a diameter of 1.2 mm, the magnetization of which is oriented perpendicular to the plane of the substrate, leads to the formation of a vortex-like magnetic structure in the film, characterized by diffuse domain walls.
研究了在恒定磁场作用下磁控溅射制备的直径为3mm的圆形FeNi薄膜。由直径为1.2 mm的永磁体产生的磁场的存在,其磁化方向垂直于衬底平面,导致薄膜中形成涡状磁性结构,其特征是漫射畴壁。
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引用次数: 0
Энергетический спектр и спектр оптического поглощения экзоэдрального фуллерена С-=SUB=-70-=/SUB=-Br-=SUB=-10-=/SUB=- в модели Хаббарда 哈伯德模型中的能量谱和光学吸收光谱
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.01.53939.470
А. В. Силантьев
Energy spectrum exohedral fullerene С70Br10 with the Cs symmetry groups have been obtained within the Hubbard model and static fluctuation approximation. The energy states have been classified using the methods of group theory, and the allowed transitions in the energy spectra of molecule С70Br10 have been determined. On the basis of the energy spectrum of exohedral fullerene С70Br10 is given an interpretation of experimentally observed optical absorption bands molecule С70Br10.
在Hubbard模型和静态涨落近似下,得到了具有Cs对称基团的外面体富勒烯С70Br10的能谱。利用群论方法对分子能态进行了分类,并确定了分子С70Br10能谱中允许的跃迁。根据外面体富勒烯С70Br10的能谱,给出了实验观察到的分子С70Br10光学吸收带的解释。
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引用次数: 0
Теплофизические свойства и фазовые переходы сегнетоэлектрика PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=- в области высоких температур 热力学家PbFe-= =SUB - 5-= -Nb-= =SUB - 5-= =SUB - 5-= =SUB -3-= =SUB
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.03.54754.562
С. Н. Каллаев, А. Г. Бакмаев, З. М. Омаров
The thermophysical properties of the ferroelectric PbFe0.5Nb0.5O3 in the temperature range 300–800 K are studied. Anomalies in the heat capacity and thermal diffusion are found in the region of the diffuse ferroelectric transition Tc~380 K, the Burns temperature Td~670 K, and the intermediate temperature T^*~470 K. The dominant phonon heat transfer mechanisms in a ferroelectric with a nanopolar structure.
研究了铁电体PbFe0.5Nb0.5O3在300 ~ 800 K范围内的热物理性质。在弥漫性铁电跃迁Tc~380 K区、Burns温度Td~670 K区和中间温度T^*~470 K区发现了热容和热扩散的异常。具有纳米极结构的铁电体中主要声子传热机制。
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引用次数: 0
Магнитоимпеданс в сульфиде марганца, замещенного лютецием 路德会取代硫化锰中的磁阻抗
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.02.54293.527
Максим Николаевич Ситников, С. С. Аплеснин, А. М. Харьков, Х. Абдельбаки, Ф В Зеленов
The components of the impedance, the impedance of the LuxMn1-xS solid solution (x < 0.2) in the temperature range of 80-500 K and the frequency of 100-106 Hz were studied. A change in the sign of the magnetoimpedance in concentration and temperature is found. The contribution of the reactive and active components to the magnetoimpedance is determined. The correlation of magnetoimpedance temperatures with the temperatures of the maximum attenuation of ultrasound and electrosound has been established. The frequency dependences of the reactive part of the impedance are described in the Cole-Cole model.
研究了LuxMn1-xS固溶体(x < 0.2)在温度为80 ~ 500 K、频率为100 ~ 106 Hz范围内的阻抗组成。发现了磁阻抗符号在浓度和温度上的变化。确定了无功和有功分量对磁阻抗的贡献。建立了磁阻抗温度与超声和电声最大衰减温度的相关性。在Cole-Cole模型中描述了阻抗无功部分的频率依赖性。
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引用次数: 0
Микроструктура сферолитовых тонких пленок цирконата-титаната свинца 圆球薄膜钛铅微结构
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.08.56155.140
М. В. Старицын, В. П. Пронин, И.И. Хинич, С.В. Сенкевич, Е.Ю. Каптелов, И. П. Пронин, А.С. Елшин, Е. Д. Мишина
The features of the microstructure of radiant spherulites in lead zirconate titanate thin films are studied using scanning electron and nonlinear optical microscopy by varying the blocks size of the perovskite structure. It is shown that with an increase in the radius of the spherulite (or the size of blocks), the angle of rotation of the growth axis increases, the speed of the angle of rotation, and the magnitude of the signal of the second optical harmonic It is assumed that the reasons determining specifics of the structure and signal of the second optical harmonic are associated with a change in the magnitude of mechanical stresses in the films that arise due to a change in the phase density at perovskite phase crystallization from low-temperature pyrochlore phase or at perovskite phase recrystallization
利用扫描电子显微镜和非线性光学显微镜研究了锆钛酸铅薄膜中辐射球粒的微观结构特征。结果表明,随着球晶半径(或块状)的增大,生长轴的旋转角度增大,旋转角度的速度增大,假设,决定结构和第二光谐波信号的具体原因与薄膜中机械应力的大小变化有关,这种机械应力的大小变化是由于钙钛矿相结晶时从低温焦绿石相结晶或钙钛矿相再结晶时相密度的变化引起的
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引用次数: 0
Фазовые переходы в фрустрированном кобальтите TmBaCo-=SUB=-4-=/SUB=-O-=SUB=-7-=/SUB=- -= ytet -伊甸园字幕组=-翻译:
Pub Date : 2023-01-01 DOI: 10.21883/ftt.2023.09.56257.138
З. А. Казей, В. В. Снегирев, М. С. Столяренко
For the first time, changes in lattice parameters (metrics) during a structural transition in stoichiometric cobalt TmBaCo4O7+x with x~ 0 (iodometric titration method) obtained by quenching from 900-950oC were investigated by direct X-ray method. It was found that during the structural transition TS~220-240 K, the Delta a/a parameter does not detect any features, parameters b and c experience jumps of different sign and different magnitude Delta b/b~3.5·10-3 and Delta c/c~-4.0·10-3, which leads to a jump in the volume of Delta V/V~ -0.5·10-3. The distortion value eo ~ -3.5·10-3 remains constant with increasing temperature and disappears abruptly during the transition.The distortion of the structure is accompanied by abnormal behavior of the Young's Delta E(T)/E0 module in the TS region. In the region of the expected magnetic phase transition of the cobalt subsystem, anomalies on the Young's modulus curve Delta E(T)/E0 were not detected, and a strong absorption peak at T~ 96 K on the internal friction dependence q-1(T) is, apparently, a sign of a developed short-range order.
本文首次用直接x射线法研究了900 ~ 950℃淬火得到的x~ 0(碘滴定法)化学计量钴TmBaCo4O7+x在结构转变过程中晶格参数(度量)的变化。研究发现,在结构跃迁TS~220 ~ 240 K期间,δ a/a参数没有探测到任何特征,参数b和c经历了不同符号和不同量级的δ b/b~3.5·10-3和δ c/c~-4.0·10-3的跳跃,导致δ V/V~ -0.5·10-3体积的跳跃。变形值eo ~ -3.5·10-3随温度升高保持恒定,在转变过程中突然消失。结构的变形伴随着TS区杨氏δ E(T)/E0模的异常行为。在钴子系统的预期磁相变区域,杨氏模量曲线δ E(T)/E0未检测到异常,并且在T~ 96 K处对内摩擦依赖q-1(T)有很强的吸收峰,这显然是一个发展的短程顺序的标志。
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引用次数: 0
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Физика твердого тела
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