JETP Letters最新文献_第7页

Influence of the Spin Hall Effect on the Resonance Frequency and Magnetic Susceptibility of a Magnonic Waveguide 自旋霍尔效应对磁波导谐振频率和磁化率的影响

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603622

O. S. Temnaya, S. A. Nikitov

引用次数: 0

Electronic Raman Scattering Thermometry of Disordered Solids 无序固体的电子拉曼散射测温

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603737

E. I. Battalova, S. S. Kharintsev

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Generation and Absorption of Photons by a Two-Level Atom Ultrastrongly Coupled to an Electromagnetic Field 双能级原子与电磁场的超强耦合对光子的产生和吸收

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024604020

A. V. Kozlovskii

{"title":"Generation and Absorption of Photons by a Two-Level Atom Ultrastrongly Coupled to an Electromagnetic Field","authors":"A. V. Kozlovskii","doi":"10.1134/S0021364024604020","DOIUrl":"10.1134/S0021364024604020","url":null,"abstract":"Within the Rabi quantum model, it has been shown theoretically that a two-level atom ultrastrongly coupled to an electromagnetic field generates or absorbs photons. Photons can be generated if the field is initially in the vacuum state. Under certain initial states of the atom + field system, the absorption of photons is possible in the field mode in the ultrastrong atom–field coupling regime. If the atom is initially in the ground (unexcited) state and the field is in the vacuum state, photons can be generated under resonance condition ωa ≈ ωf or ξ ≡ ωa/ωf ≈ 1, where ωa and ωf are the atomic transition and field frequencies, respectively, in the ultrastrong coupling regime. At the negative detuning when ξ ( ll ) 1 or ωa ( ll ) ωf, Rabi oscillations of the average number of photons ({{langle hat {n}rangle }_{t}}) with (0 leqslant {{langle hat {n}rangle }_{t}} leqslant {{n}_{{max }}} gg 1) are observed in the case of the ultrastrong coupling with the atom–field coupling constant (tilde {g} equiv {text{|}}g{text{|/}}{{omega }_{{text{f}}}} sim 1); in this case, the population of the excited atomic state is Pe(t) ≈ 0.5. At a large positive detuning when ξ ( gg ) 1, photons are not generated, i.e., (langle hat {n}rangle approx 0), and the atom remains in the initial state, i.e., Pe(t) ≈ 0. The statistics of photons in the generation regime is nearly chaotic: the variance of photons is much larger than the level of the coherent field state (i.e., is super-Poisson). Field photons are absorbed without the excitation of the atom in the ultrastrong coupling regime in the case of the coherent initial state of the field ((langle hat {n}(t = 0rangle > 0)) for certain positive detuning values. In this case, the field becomes sub-Poisson.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"720 - 726"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604020.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940688","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

Small-Scale Light Structures in a Kerr Medium 克尔介质中的小尺度光结构

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603646

V. P. Ruban

引用次数: 0

Anomalous Behavior of Long-Wavelength Optical Phonons in a Relaxor Ferroelectric PbNi1/3Nb2/3O3 铁电弛豫器PbNi1/3Nb2/3O3中长波长光学声子的反常行为

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603300

N. K. Derets, A. I. Fedoseev, T. A. Smirnova, J.-H. Ko, S. G. Lushnikov

{"title":"Anomalous Behavior of Long-Wavelength Optical Phonons in a Relaxor Ferroelectric PbNi1/3Nb2/3O3","authors":"N. K. Derets, A. I. Fedoseev, T. A. Smirnova, J.-H. Ko, S. G. Lushnikov","doi":"10.1134/S0021364024603300","DOIUrl":"10.1134/S0021364024603300","url":null,"abstract":"The paper presents the results of studying the vibrational spectrum of the PbNi1/3Nb2/3O3 (PNN) crystal using Raman scattering in the temperature range from 100 to 650 K, including the region of the “diffuse phase transition” with a maximum permittivity at ({{T}_{m}} = 150{kern 1pt} ) K at a frequency of 10 kHz. Polarized light scattering spectra in PNN are similar to those observed in a number of studied relaxor ferroelectrics with a perovskite structure (AB{kern 1pt} '{kern 1pt} B{kern 1pt} ''{kern 1pt} {{O}_{3}}). Analysis of the temperature evolution of phonon modes allowed us to identify special points in the dynamics of the PNN crystal lattice at ({{T}_{1}} = 280{kern 1pt} ) K and ({{T}_{m}} = 150{kern 1pt} ) K. It is shown that anomalies in the temperature behavior of optical phonons in the vicinity of ({{T}_{1}}) can be associated with the dynamics of polar nanoregions, the nature of which changes from dynamic to static. In the studied temperature range, a sequence of phase transformations is proposed for PNN crystals.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"741 - 746"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603300.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941063","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

Excess Entropy of Metallic Glasses and Its Relation to the Glass-Forming Ability of Maternal Melts 金属玻璃的超熵及其与母熔体玻璃形成能力的关系

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024602975

A. S. Makarov, R. A. Konchakov, G. V. Afonin, J. C. Qiao, N. P. Kobelev, V. A. Khonik

引用次数: 0

Nanostructured Gd2O3:Yb Micropowder for Antibacterial Hyperthermia 纳米结构Gd2O3:Yb微粉用于抗菌热疗

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603233

D. P. Shcherbinin, D. V. Bulyga, I. N. Saraeva, E. R. Tolordava, A. A. Peunkov, D. M. Dolgintsev, A. N. Babkina, A. V. Ivanov, S. I. Kudryashov

{"title":"Nanostructured Gd2O3:Yb Micropowder for Antibacterial Hyperthermia","authors":"D. P. Shcherbinin, D. V. Bulyga, I. N. Saraeva, E. R. Tolordava, A. A. Peunkov, D. M. Dolgintsev, A. N. Babkina, A. V. Ivanov, S. I. Kudryashov","doi":"10.1134/S0021364024603233","DOIUrl":"10.1134/S0021364024603233","url":null,"abstract":"A method has been proposed for photoinduced hyperthermia of pathogenic Gram-negative bacteria P. aeruginosa using Gd2O3:Yb micropowder. It is based on the possibility of laser excitation of anti-Stokes luminescence on ytterbium ions in the gadolinium oxide micropowder, which allows us, on the one hand, to heat the powder to the required temperature and, on the other hand, to accurately control the powder temperature using remote luminescent thermometry. It has been demonstrated that the long-term irradiation of the Gd2O3:Yb micropowder with 1035-nm nanosecond laser radiation changes the shape of anti-Stokes luminescence spectra associated with micropowder heating in the range from 27 to 63°C. The application of the proposed photoinduced hyperthermia method to a mixture of solutions of the Gd2O3:Yb micropowder and P. aeruginosa bacteria demonstrates a decrease in the bacterial population by 90%.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"788 - 793"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603233.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940691","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

Compensation of the Effect of the Imperfection of the Nuclotron/JINR Lattice on the Proton Polarization near an Integer Spin Resonance (Brief Review) 核/JINR晶格缺陷对整数自旋共振附近质子极化影响的补偿（综述）

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603695

Yu. N. Filatov, A. M. Kondratenko, N. N. Nikolaev, Yu. V. Senichev, M. A. Kondratenko, S. V. Vinogradov, E. D. Tsyplakov, A. I. Chernyshov, A. V. Butenko, S. A. Kostromin, V. P. Ladygin, E. M. Syresin, E. A. Butenko, I. L. Guryleva, A. A. Melnikov, A. E. Aksentev

{"title":"Compensation of the Effect of the Imperfection of the Nuclotron/JINR Lattice on the Proton Polarization near an Integer Spin Resonance (Brief Review)","authors":"Yu. N. Filatov, A. M. Kondratenko, N. N. Nikolaev, Yu. V. Senichev, M. A. Kondratenko, S. V. Vinogradov, E. D. Tsyplakov, A. I. Chernyshov, A. V. Butenko, S. A. Kostromin, V. P. Ladygin, E. M. Syresin, E. A. Butenko, I. L. Guryleva, A. A. Melnikov, A. E. Aksentev","doi":"10.1134/S0021364024603695","DOIUrl":"10.1134/S0021364024603695","url":null,"abstract":"A number of open questions remain in the manipulation of the spins of colliding beams, which is a key aspect in the operation of polarized beam colliders such as the Nuclotron-based ion collider facility (JINR, Dubna, Russia) and the electron ion collider (BNL, United States). The spin transparency regime, which is the only realistic regime to control the deuteron polarization, has not yet been approved experimentally. With the existing configuration of the JINR accelerator complex, a pilot spin transparency experiment could be performed on a proton beam in the Nuclotron synchrotron. The dynamics of the proton beam polarization during the fast crossing of spin resonance guided by spin navigators based on regular orbit-steerer dipoles has been analyzed in this work. A scheme has been designed to compensate the coherent action of Nuclotron lattice imperfections on spin. In this scheme, the spin field induced by lattice imperfections is determined from the adiabatic deviation of spins in the resonance region, taking into account the synchrotron energy modulation. Integer-resonance strengths can be compensated down to the limits conditioned by orbital beam emittances. The numerical simulation of the proposed spin compensator has confirmed that the spin transparency regime in an imperfect Nuclotron lattice with a strongly distorted closed orbit can be experimentally verified.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"779 - 787"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940693","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

Effect of Electron-Deficient Substitution on the Spin Dynamics in FeGa3 缺电子取代对FeGa3自旋动力学的影响

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603476

A. V. Tkachev, S. V. Zhurenko, M. R. Bikmukhametova, M. S. Likhanov, A. V. Shevelkov, A. A. Gippius

{"title":"Effect of Electron-Deficient Substitution on the Spin Dynamics in FeGa3","authors":"A. V. Tkachev, S. V. Zhurenko, M. R. Bikmukhametova, M. S. Likhanov, A. V. Shevelkov, A. A. Gippius","doi":"10.1134/S0021364024603476","DOIUrl":"10.1134/S0021364024603476","url":null,"abstract":"The nuclear quadrupole resonance study of the electron-deficient substitution in the promising thermoelectric material FeGa3 resulting in the poorly studied Fe0.92Re0.08Ga3 and Fe0.92Mn0.08Ga3 compounds has been carried out. The doping of compounds of this structure type promotes the study of the dependence of the thermoelectric characteristics on the electronic structure and finally makes it possible to increase the thermoelectric efficiency, which is very important for applications. Both compounds exhibit pronounced signatures of the formation of an additional acceptor band inside the main band gap, which is determined by rhenium and manganese substituent atoms. Nuclear quadrupole resonance spectra, as well as nuclear spin–lattice relaxation and its temperature evolution, are significantly different for the compounds under study. This difference is due to different statistical distributions of substituent atoms (predominant formation of homo- and heterogeneous dumbbells in the rhenium- and manganese-substituted compounds, respectively) caused by their outer electron shells.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"732 - 740"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024603476.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940687","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

Interparticle Magnetic Interactions and the Field Dependence of the Superparamagnetic Blocking Temperature in a Powder System of Ultrasmall Nickel Ferrite Particles 超小镍铁氧体颗粒粉末体系中粒子间磁相互作用及超顺磁阻塞温度的场依赖性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-01-10 DOI: 10.1134/S0021364024603865

D. A. Balaev, A. A. Krasikov, Yu. V. Knyazev, S. V. Stolyar, A. O. Shokhrina, A. D. Balaev, R. S. Iskhakov

{"title":"Interparticle Magnetic Interactions and the Field Dependence of the Superparamagnetic Blocking Temperature in a Powder System of Ultrasmall Nickel Ferrite Particles","authors":"D. A. Balaev, A. A. Krasikov, Yu. V. Knyazev, S. V. Stolyar, A. O. Shokhrina, A. D. Balaev, R. S. Iskhakov","doi":"10.1134/S0021364024603865","DOIUrl":"10.1134/S0021364024603865","url":null,"abstract":"The dependence of the superparamagnetic blocking temperature on an external magnetic field TB(H) has been studied and analyzed for a nickel ferrite nanoparticle powder system in order to establish the influence of magnetic interparticle interactions on superparamagnetic blocking. The features of this system are: (i) a small particle size (~4–5 nm on average); (ii) a pronounced “core/shell” structure of particles, in which the magnetic moment of a particle is formed by a ferrimagnetically ordered core, while the spins of the surface layer, about 1 nm thick, do not contribute to this magnetic moment. The random anisotropy model, which describes the influence of magnetic interparticle interactions on the TB value in the external field, is used to reproduce the experimental dependence TB(H) obtained by static magnetometry. The analysis has demonstrated strong magnetic interactions in the studied system, which are manifested in a sharp decrease in the TB value in the weak-field region, and has made it possible to quantitatively estimate the intensity and energy of magnetic interparticle interactions, as well as to determine the magnetic anisotropy constant of individual particles (without the influence of magnetic interparticle interactions). The role of the subsystem of surface spins, which, according to the imaginary part of the magnetic susceptibility, exhibits signatures of collective behavior, is discussed as a possible source of magnetic interparticle interactions.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 10","pages":"751 - 758"},"PeriodicalIF":1.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941059","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