JETP Letters最新文献_第4页

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

Interplay of Domain Walls and the Supercurrent in a Topological Josephson Junction

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-28 DOI: 10.1134/S0021364024604548

K. Turyshev, Yu. Makhlin

引用次数: 0

Highly Correlated Electronic State in the Ferrimagnetic Quadruple Perovskite CuCu3Fe2Re2O12

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2024-12-28 DOI: 10.1134/S002136402460441X

A. I. Poteryaev, Z. V. Pchelkina, S. V. Streltsov, Y. Long, V. Yu. Irkhin

引用次数: 0

Digitization of 93.3-keV Recoilless γ Radiation