The European Physical Journal B最新文献_第7页

Why and how did the COVID pandemic end abruptly? 为什么 COVID 大流行会戛然而止？

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-14 DOI: 10.1140/epjb/s10051-024-00733-0

Marcelo A. Moret, James C. Phillips

引用次数: 0

Half Landau–Zener ramp to a quantum phase transition in a dissipative single spin model 耗散单自旋模型中的半兰道-齐纳斜坡到量子相变

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-13 DOI: 10.1140/epjb/s10051-024-00749-6

Sei Suzuki

引用次数: 0

Fractality in resistive circuits: the Fibonacci resistor networks 电阻电路中的分形：斐波纳契电阻网络

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-13 DOI: 10.1140/epjb/s10051-024-00750-z

Petrus H. R. dos Anjos, Fernando A. Oliveira, David L. Azevedo

引用次数: 0

Scheduling meetings: are the odds in your favor? 安排会议：你的胜算大吗？

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-13 DOI: 10.1140/epjb/s10051-024-00742-z

Katherine Brown, Harsh Mathur, Onuttom Narayan

{"title":"Scheduling meetings: are the odds in your favor?","authors":"Katherine Brown, Harsh Mathur, Onuttom Narayan","doi":"10.1140/epjb/s10051-024-00742-z","DOIUrl":"10.1140/epjb/s10051-024-00742-z","url":null,"abstract":"<p>Polling all the participants to find a time when everyone is available is the ubiquitous method of scheduling meetings nowadays. We examine the probability of a poll with <i>m</i> participants and <span>(ell )</span> possible meeting times succeeding, where each participant rejects <i>r</i> of the <span>(ell )</span> options. For large <span>(ell )</span> and fixed <span>(r/ell ,)</span> we can carry out a saddle-point expansion and obtain analytical results for the probability of success. Despite the thermodynamic limit of large <span>(ell ,)</span> the ‘microcanonical’ version of the problem where each participant rejects exactly <i>r</i> possible meeting times, and the ‘canonical’ version where each participant has a probability <span>(p = r/ell )</span> of rejecting any meeting time, only agree with each other if <span>(mrightarrow infty .)</span> For <span>(mrightarrow infty ,)</span> <span>(ell )</span> has to be <span>(O(p^{-m}))</span> for the poll to succeed, i.e., the number of meeting times that have to be polled increases exponentially with <i>m</i>. Equivalently, as a function of <i>p</i>, there is a discontinuous transition in the probability of success at <span>(p sim 1/ell ^{1/m})</span>. If the participants’ availability is approximated as being unchanging from one week to another, i.e., <span>(ell )</span> is limited, a realistic example discussed in the text of the paper shows that the probability of success drops sharply if the number of participants is greater than approximately 4.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 8","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-024-00742-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227813","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

Exact ground states for pentagon chains with spin–orbit interaction 具有自旋轨道相互作用的五边形链的精确基态

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-12 DOI: 10.1140/epjb/s10051-024-00757-6

Zsolt Gulacsi

引用次数: 0

Non-additive stochastic model for supercooled liquids: new perspectives for glass science 过冷液体的非加性随机模型：玻璃科学的新视角

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-12 DOI: 10.1140/epjb/s10051-024-00761-w

Antonio Cesar do Prado Rosa Jr., Elias Brito, Wanisson Santana, Clebson Cruz

引用次数: 0

Polarization evolution equation for exchange-strictionally formed type II multiferroic materials 交换摩擦形成的 II 型多铁性材料的极化演化方程

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-10 DOI: 10.1140/epjb/s10051-024-00756-7

Pavel A. Andreev, Mariya Iv. Trukhanova

{"title":"Polarization evolution equation for exchange-strictionally formed type II multiferroic materials","authors":"Pavel A. Andreev, Mariya Iv. Trukhanova","doi":"10.1140/epjb/s10051-024-00756-7","DOIUrl":"10.1140/epjb/s10051-024-00756-7","url":null,"abstract":"<p> Multiferroics are materials where a single cell of a magnetically ordered crystal forms an electric dipole moment. In this work, we derive an equation for the evolution of the macroscopic density of the electric dipole moment (polarization of the system). For this purpose, we employ the quantum hydrodynamic method, which allows us to derive equations for the evolution of the macroscopic functions of quantum systems starting with the microscopic description. Here, we do not consider the microscopic level of individual electrons and ions; rather, we start our analysis from the combination of ions in the cells of the crystal. We present an effective Hamiltonian for the evolution of such intermediate-scale objects. We also apply the equation for the electric dipole moment of the single cell, which is re-contracted in the corresponding operator. Using this operator and the wave function of the combination of ions in the cell, we define the macroscopic density of the electric dipole moment. Finally, we apply the nonstationary Schrodinger equation with the chosen Hamiltonian in order to derive the equation for the evolution of the polarization which describes the dipole formed by the exchange-striction mechanism in type II multiferroic materials. The interaction-defined term in the polarization evolution equation is found to be proportional to the fourth space derivative of a mixed product (triple scalar product) of three spin-density vectors. Conditions are discussed for the regime where the interaction appears in a smaller order on the space derivatives.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 8","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141943191","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

Exploring the electronic structure, mechanical stability, thermodynamic and magnetic properties of rare-earth full-Heusler alloys Pd2GdxLa1−xIn (x = 1, 0.75, 0.5, 0.25, and 0): a DFT approach 探索稀土全赫斯勒合金 Pd2GdxLa1-xIn (x = 1, 0.75, 0.5, 0.25, and 0) 的电子结构、机械稳定性、热力学和磁学特性：一种 DFT 方法

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-10 DOI: 10.1140/epjb/s10051-024-00758-5

Halima Bouchenafa, Boucif Benichou, Badra Bouabdallah, Zakia Nabi

{"title":"Exploring the electronic structure, mechanical stability, thermodynamic and magnetic properties of rare-earth full-Heusler alloys Pd2GdxLa1−xIn (x = 1, 0.75, 0.5, 0.25, and 0): a DFT approach","authors":"Halima Bouchenafa, Boucif Benichou, Badra Bouabdallah, Zakia Nabi","doi":"10.1140/epjb/s10051-024-00758-5","DOIUrl":"10.1140/epjb/s10051-024-00758-5","url":null,"abstract":"<div><p>We have extensively studied the structural, elastic, mechanical, thermodynamic, electronic, and magnetic properties of Pd-based rare-earth full-Heusler alloys Pd<sub>2</sub>YIn (<i>Y</i> = Gd, La) and their quaternary alloys Pd<sub>2</sub>Gd<sub><i>x</i></sub>La<sub>1−<i>x</i></sub>In (<i>x</i> = 0.75, 0.5, and 0.25) using the full-potential linearized augmented-plane wave (FP-LAPW) approach in the generalized gradient (GGA) approximation based on the WIEN2k program. Our findings offer a theoretical investigation of the combined Heusler alloys Pd<sub>2</sub>Gd<sub><i>x</i></sub>La<sub>1−<i>x</i></sub>In, in which most of their properties studied here have not yet been determined. It is demonstrated that the estimated equilibrium lattice constants and spin magnetic moments and the experimental values of the parent alloys agree well. The electronic structure shows that our compounds have a metallic ferromagnetic nature, except for the Pd<sub>2</sub>LaIn alloy, which is not ferromagnetic. Furthermore, the mechanical results indicate that the studied compounds are mechanically stable, anisotropic, and exhibit ductile behavior. Consequently, it is anticipated that Pd<sub>2</sub>Gd<sub><i>x</i></sub>La<sub>1−<i>x</i></sub> In Heusler alloy will be interesting candidates in spintronic devices and transport applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 8","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-024-00758-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141943248","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

Density matrix renormalization group study of the interacting Kitaev chain with quasi-periodic disorder 具有准周期性无序的相互作用基塔耶夫链的密度矩阵重正化群研究

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-08 DOI: 10.1140/epjb/s10051-024-00690-8

K. S. C. Decker, C. Karrasch

引用次数: 0

Dependence of optical and dielectric properties on heat treatment of calcium-doped manganites 掺钙锰矿的光学和介电性质与热处理的关系

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-08-07 DOI: 10.1140/epjb/s10051-024-00741-0

Mahrous R. Ahmed, E. Kh. Shokr, I. A. Abdel-Latif, Ibrahim Y. Khaled, E. M. M. Ibrahim, Sara A. Mohamed

{"title":"Dependence of optical and dielectric properties on heat treatment of calcium-doped manganites","authors":"Mahrous R. Ahmed, E. Kh. Shokr, I. A. Abdel-Latif, Ibrahim Y. Khaled, E. M. M. Ibrahim, Sara A. Mohamed","doi":"10.1140/epjb/s10051-024-00741-0","DOIUrl":"10.1140/epjb/s10051-024-00741-0","url":null,"abstract":"<div><p>This work investigates Nd<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> (NCMO) samples, which were prepared using solid-state reaction and annealed at different temperatures (700, 800, and 900 °C). Our studies showed variations in impedance (<i>Z</i>), conductivity (σ), dielectric constant (ε), dielectric loss factor, and tan(δ) with frequency. From the analysis of AC conductivity, the semimetal behavior of the material was apparent when the annealing temperature increased. Impedance measurements showed characteristics of a capacitor’s dielectric material. The optical parameters of the NCMO samples were calculated from transmittance and reflectance measurements. The optical study showed that the samples have an indirect band energy gap. The resulting <i>E</i><sub>g</sub> values were 0.89, 0.94, 0.93, and 0.91 eV for the as-prepared sample and samples annealed at 700, 800, and 900 °C, respectively. With these energy gap values, the samples are suitable for photocatalysis applications in the visible light range, thus offering a low-cost alternative.</p><h3>Graphical abstract</h3><p>The energy gap values make these samples suitable for photocatalysis applications in the visible light range, which is considered a low-cost application.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 8","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141943193","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