The European Physical Journal B最新文献_第2页

The optical properties in quantum wells with trigonometric confinement potential 三角约束势量子阱的光学性质

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-27 DOI: 10.1140/epjb/s10051-025-01052-8

T. Ozdemir, E. B. AL, F. Ungan

引用次数: 0

Ecological sensitivities to the interplay of Allee effects, prey refuge and supplementary food resources in a predator–prey system 捕食者-食饵系统中对狭道效应、猎物避难所和补充食物资源相互作用的生态敏感性

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-26 DOI: 10.1140/epjb/s10051-025-01050-w

Subarna Roy, Bapin Mondal, Shubhadeep Ghosh, Pankaj Kumar Tiwari

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Chaos in thin-film ferroelectric materials under periodic electric fields with variable shapes 变形状周期性电场作用下薄膜铁电材料的混沌

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-25 DOI: 10.1140/epjb/s10051-025-01038-6

Nguezbai Jacob, Kengne Romaric, Douvagai, Malwe Boudoue Hubert, Mibaile Justin, Serge Y. Doka

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Hamiltonian dynamics and extrinsic electric field indirect coupling as a tool for management of neuronal activity in a generalized two dimensional Hindmarsh–Rose model 哈密顿动力学和外源电场间接耦合作为广义二维Hindmarsh-Rose模型中神经元活动管理的工具

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-23 DOI: 10.1140/epjb/s10051-025-01044-8

N. S. Mundih, A. Mvogo, D. Belobo Belobo, C. B. Tabi, T. C. Kofané

{"title":"Hamiltonian dynamics and extrinsic electric field indirect coupling as a tool for management of neuronal activity in a generalized two dimensional Hindmarsh–Rose model","authors":"N. S. Mundih, A. Mvogo, D. Belobo Belobo, C. B. Tabi, T. C. Kofané","doi":"10.1140/epjb/s10051-025-01044-8","DOIUrl":"10.1140/epjb/s10051-025-01044-8","url":null,"abstract":"<p>In this work, we investigate a generalized two dimensional Hindmarsh−Rose neuronal model which single out the distinct roles of the Hamiltonian and its time-derivative (instantaneous power) in shaping the neuronal activity of neurons coupled indirectly by an extrinsic electric field adjustable by an experimenter. By imposing a periodic extrinsic field, we demonstrate how neurons are driven into complete synchronization by the extrinsic electric field and we identify critical thresholds values of the amplitude and the frequency of the extrinsic electric field below which neuronal activity with amplitude death occurs. Strikingly, exceeding these thresholds values triggers a rebound of oscillatory activity. Analytical calculations using the Helmholtz’s theorem yield closed−form expressions for the Hamiltonian along with its instantaneous power reveal that the contributions of the extrinsic electric field add up in each neuron. Intensive numerical simulations confirm the existence of sharp amplitude and frequency boundaries separating regimes of neuronal silencing and revival of neuronal dynamics. Moreover, variations in neuronal radius are shown to modulate excitability through capacitance effects, with larger cells exhibiting suppressed oscillations. Our results highlight crucial mechanisms by which modulated extrinsic electric fields regulate neuronal behavior offering potential control strategies for neuromodulation applications.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110491","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

Magnetism and electronic dynamics in CuCr2-xSnxS4 spinels studied by transferred hyperfine fields at 119Sn and muon spin rotation and relaxation 利用119Sn转移超精细场和介子自旋和弛豫研究了CuCr2-xSnxS4尖晶石的磁性和电子动力学

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-22 DOI: 10.1140/epjb/s10051-025-01046-6

Elaheh Sadrollahi, Cynthia P. C. Medrano, Magno A. V. Heringer, E. M. Baggio Saitovitch, Lilian Prodan, Vladimir Tsurkan, F. Jochen Litterst

{"title":"Magnetism and electronic dynamics in CuCr2-xSnxS4 spinels studied by transferred hyperfine fields at 119Sn and muon spin rotation and relaxation","authors":"Elaheh Sadrollahi, Cynthia P. C. Medrano, Magno A. V. Heringer, E. M. Baggio Saitovitch, Lilian Prodan, Vladimir Tsurkan, F. Jochen Litterst","doi":"10.1140/epjb/s10051-025-01046-6","DOIUrl":"10.1140/epjb/s10051-025-01046-6","url":null,"abstract":"<div><p>We investigated magnetization, muon spin rotation and relaxation (µSR), and <sup>119</sup>Sn Mössbauer spectroscopy on Sn substituted CuCr<sub>2-<i>x</i></sub>Sn<sub><i>x</i></sub>S<sub>4</sub> (<i>x</i> = 0.03 and 0.08) spinel compounds. The magnetization and µSR results reveal similar additional low-temperature magnetic transitions around 80 K and 40 K as found for the undoped material, indicating a magnetic ground state deviating from a simple collinear ferromagnet. The observed changes in the Mössbauer spectra are less pronounced and are discussed in view of the different positions of the local probes µ<sup>+</sup> and <sup>119</sup>Sn and their different magnetic coupling to the magnetic Cr lattice. Above 80 K, both µSR and Mössbauer spectra show temperature-dependent inhomogeneous broadening either due to structural or charge disorder and changing spin dynamics that can be related to a precursor magnetic phase above the well-defined static low-temperature phase.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-01046-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100807","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

Shear flow of liquid and frozen water in a silica nanochannel 二氧化硅纳米通道中液体和冷冻水的剪切流动

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-22 DOI: 10.1140/epjb/s10051-025-01045-7

Raihan Alfaridzi, Simon Stephan, Herbert M. Urbassek, Yudi Rosandi

引用次数: 0

Co2MnGe ferromagnetic Heusler alloys: magnetic characteristics and hysteretic behavior by mean field theory Co2MnGe铁磁Heusler合金：磁特性和磁滞特性的平均场理论

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-22 DOI: 10.1140/epjb/s10051-025-01047-5

A. Elhani, A. Lafhal, T. Mouhrach, E. B. Choubabi, M. El Bouziani

{"title":"Co2MnGe ferromagnetic Heusler alloys: magnetic characteristics and hysteretic behavior by mean field theory","authors":"A. Elhani, A. Lafhal, T. Mouhrach, E. B. Choubabi, M. El Bouziani","doi":"10.1140/epjb/s10051-025-01047-5","DOIUrl":"10.1140/epjb/s10051-025-01047-5","url":null,"abstract":"<div><p>In this study, we have successfully explored the magnetic properties and hysteresis behavior of the Heusler compound Co₂MnGe. To this end, the material was modeled as a mixed-spin ferromagnetic Ising system (5/2, 2) and the analysis was conducted using the mean-field approximation, based on the Gibbs-Bogoliubov inequality applied to the free energy. We examined the effect of various physical parameters, including exchange interactions, crystalline anisotropies, external magnetic field and temperature on the overall magnetic and hysteretic behavior of the system. The theoretical model highlighted the existence of both first- and second-order phase transitions, as well as the high sensitivity of hysteresis loops to variations in these parameters. Remarkable phenomena were also observed, such as the multiplicity of saturation values for ground-state magnetization and the formation of complex hysteresis loops. Finally, the results obtained are broadly in line with those reported in the literature, attesting to the relevance of this approach to the analysis of the magnetic properties of Heusler alloys.</p><h3>Graphical abstract</h3><p>The structure of Co<sub>2</sub>MnGe, often known as the L2<sub>1</sub> structure, is a member of space group 225 (Fm<sup>−</sup>3m)</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100811","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

Thermodynamic properties and superstatistics of graphene under a constant magnetic field 恒定磁场下石墨烯的热力学性质和超统计量

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-21 DOI: 10.1140/epjb/s10051-025-01042-w

Assimiou M. Yarou, Daniel S. Takou, Amidou Boukari, Guingarey Issoufou, Finagnon A. Dossa, Gabriel Y. H. Avossevou

引用次数: 0

Dynamic hysteresis properties of multilayer square lattices modeled by the spin-7/2 Ising system under oscillating magnetic fields 振荡磁场下自旋-7/2 Ising系统多层方格的动态迟滞特性

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-20 DOI: 10.1140/epjb/s10051-025-01039-5

Mehmet Batı

引用次数: 0

Energy harvesting out of colored Lévy fluctuations, by a nonlinear piezoelectric transducer 利用非线性压电换能器，从彩色lsamy波动中收集能量

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-09-17 DOI: 10.1140/epjb/s10051-025-01041-x

M. E. Giuliano, A. D. Sánchez

{"title":"Energy harvesting out of colored Lévy fluctuations, by a nonlinear piezoelectric transducer","authors":"M. E. Giuliano, A. D. Sánchez","doi":"10.1140/epjb/s10051-025-01041-x","DOIUrl":"10.1140/epjb/s10051-025-01041-x","url":null,"abstract":"<p>This study investigates the performance of a nonlinear piezoelectric energy harvester subjected to <span>(alpha )</span>-stable Lévy noise, which features infinite variance and long-tail distributions. Using numerical simulations, we analyze how the harvester’s nonlinear restoring potential interacts with these non-Gaussian fluctuations to enhance both average power output and efficiency. Our findings show that as the stability parameter <span>(alpha )</span> decreases from 2 (Gaussian noise), the system exploits the large jumps characteristic of Lévy processes, achieving significant improvements in energy harvesting, even under weak noise conditions. We also observe distinct efficiency behaviors for different load times, including a valley-shaped trend for high values of <span>(alpha )</span>. This work builds upon previous studies—J. I. Deza, R. R. Deza, and H. S. Wio. Epl. 100:38001, 2012.—that explored harvesters driven by noise within the framework of Tsallis entropy, allowing a direct comparison between Lévy and Tsallis processes. By extending the analysis to the infinite variance regime, this study highlights the broader potential of nonlinear systems to harvest energy from realistic, broadband environmental fluctuations.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073661","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