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Thermal transport in Yb-based 1-2-20 materials 镱基 1-2-20 材料中的热传输
Europhysics Letters Pub Date : 2024-02-06 DOI: 10.1209/0295-5075/ad26b0
C. Ekuma
{"title":"Thermal transport in Yb-based 1-2-20 materials","authors":"C. Ekuma","doi":"10.1209/0295-5075/ad26b0","DOIUrl":"https://doi.org/10.1209/0295-5075/ad26b0","url":null,"abstract":"\u0000 Lattice thermal transport properties of heavy fermion YbT$_2$Zn$_{20}$-based (T = Co, Rh, and Ir) 1-2-20 compounds are calculated with single-mode relaxation-time approximation and full solution of linearized phonon Boltzmann transport equation from first-principles anharmonic phonon calculations. We predict low lattice thermal conductivity $kappa_L$ with a maximum value of $sim24.16,$mW/m-K at 85.14 K, 137.29 mW/m-K at 9.67 K, and 23.55 mW/m-K at 67.50 K and $sim12.02,$, 40.04, and 10.30 mW/m-K at room temperature for YbCo$_2$Zn$_{20}$, YbRh$_2$Zn$_{20}$, and YbIr$_2$Zn$_{20}$, respectively. Based on the analysis of the cumulative $kappa_L$ as a function of the phonon mean-free path and the frequency-dependent joint density of states at various temperatures, we attribute the low $kappa_L$ to a rattling mode with an average characteristic rattling frequency $omegasim2.67,$THz that enhanced phonon scattering processes, which reduced the phonon mean-free paths, suppressed the phonon lifetime, and enhanced the probability of three-phonon scattering events. The predicted low $kappa_L$, especially in YbCo$_2$Zn$_{20}$ and YbIr$_2$Zn$_{20}$, are promising for thermoelectric and thermal management applications.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"264 26‐43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139799569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal transport in Yb-based 1-2-20 materials 镱基 1-2-20 材料中的热传输
Europhysics Letters Pub Date : 2024-02-06 DOI: 10.1209/0295-5075/ad26b0
C. Ekuma
{"title":"Thermal transport in Yb-based 1-2-20 materials","authors":"C. Ekuma","doi":"10.1209/0295-5075/ad26b0","DOIUrl":"https://doi.org/10.1209/0295-5075/ad26b0","url":null,"abstract":"\u0000 Lattice thermal transport properties of heavy fermion YbT$_2$Zn$_{20}$-based (T = Co, Rh, and Ir) 1-2-20 compounds are calculated with single-mode relaxation-time approximation and full solution of linearized phonon Boltzmann transport equation from first-principles anharmonic phonon calculations. We predict low lattice thermal conductivity $kappa_L$ with a maximum value of $sim24.16,$mW/m-K at 85.14 K, 137.29 mW/m-K at 9.67 K, and 23.55 mW/m-K at 67.50 K and $sim12.02,$, 40.04, and 10.30 mW/m-K at room temperature for YbCo$_2$Zn$_{20}$, YbRh$_2$Zn$_{20}$, and YbIr$_2$Zn$_{20}$, respectively. Based on the analysis of the cumulative $kappa_L$ as a function of the phonon mean-free path and the frequency-dependent joint density of states at various temperatures, we attribute the low $kappa_L$ to a rattling mode with an average characteristic rattling frequency $omegasim2.67,$THz that enhanced phonon scattering processes, which reduced the phonon mean-free paths, suppressed the phonon lifetime, and enhanced the probability of three-phonon scattering events. The predicted low $kappa_L$, especially in YbCo$_2$Zn$_{20}$ and YbIr$_2$Zn$_{20}$, are promising for thermoelectric and thermal management applications.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"173 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139859592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inflationary α-attractor from type IIB/F theory 来自 IIB/F 型理论的膨胀α-牵引器
Europhysics Letters Pub Date : 2024-02-01 DOI: 10.1209/0295-5075/ad3778
A. Sarkar, Buddhadeb Ghosh
{"title":"Inflationary α-attractor from type IIB/F theory","authors":"A. Sarkar, Buddhadeb Ghosh","doi":"10.1209/0295-5075/ad3778","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3778","url":null,"abstract":"\u0000 We derive an α=1/3-- attractor potential of slow-roll inflation in the warped D brane set-up featuring three intersecting D7 branes under T6 /ZN type of CY3-compactification within type IIB/F theory with some near-conifold regions. The underlying quadratic structure of the kinetic poles is found to arise from a correction in the Kähler potential when an extra contribution of open string moduli is turned on. While the closed string sector of the moduli spectrum is completely stabilized via quantum corrections of perturbative and non-perturbative origin, the open string sector plays the lead role in driving the inflationary expansion in the radial direction. A generic asymptotic behavior of the inflaton field near the pole boundaries manifests as the slow-roll plateau in canonical field space, which becomes responsible for giving universal predictions of the cosmological parameters. We find that the presence of the open strings near conifold regions brings the realization of pole inflation in the present set up.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"172 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140464036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Unusual magnetic behavior of cubic double perovskite Ba2YIrO6 with Ir5+(5d 4) ions 含有 Ir5+(5d 4) 离子的立方双包晶石 Ba2YIrO6 的异常磁性行为
Europhysics Letters Pub Date : 2024-02-01 DOI: 10.1209/0295-5075/ad219f
T. Jia, Zhi Zeng
{"title":"Unusual magnetic behavior of cubic double perovskite Ba2YIrO6 with Ir5+(5d\u0000 4) ions","authors":"T. Jia, Zhi Zeng","doi":"10.1209/0295-5075/ad219f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad219f","url":null,"abstract":"\u0000 Using density functional calculations, we investigate the electronic structure and magnetism of double-perovskite Ba2YIrO6 to explore the origin of its unusual magnetic behavior. Our results show that the breakdown of expected j = 0 nonmagnetic state of Ir5+(5d\u0000 4) in Ba2YIrO6 is induced by both bandwidth and exchange interaction. In addition, the bandwidth effect makes the system behave like metal, while the antiferromagnetic interaction between Ir ions should be responsible for the insulator behavior. Moreover, the strong geometrical frustration in Ir triangular unit prevents the formation of long-range magnetic order.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"37 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140464745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by I. Arraut 对 I. Arraut 所著 "通过修正对称性推导出的塔利-费舍定律和暗物质效应 "的评论
Europhysics Letters Pub Date : 2024-01-31 DOI: 10.1209/0295-5075/ad2728
L. F. O. Costa, F. Frutos-Alfaro, Jos'e Nat'ario, Michael Soffel
{"title":"Comment on \"The Tully-Fisher law and dark matter effects derived via modified symmetries\" by I. Arraut","authors":"L. F. O. Costa, F. Frutos-Alfaro, Jos'e Nat'ario, Michael Soffel","doi":"10.1209/0295-5075/ad2728","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2728","url":null,"abstract":"It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that General Relativity can generate effects equivalent to dark matter, based on a\"new modified symmetry that emerges at galactic scale\". We show that (i) the spacetime considered is unphysical, violating energy conditions everywhere; (ii) actually no new symmetry emerges, which results from incorrect definitions of angular momentum, velocity, and arclength in the proposed geometry; (iii) no Tully-Fisher law, or flat rotation curves are obtained either, they simply result from a series of errors in the equations.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"35 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140475971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 a critical magnetic field on the control of scalar neutral boson pair production in the context of Lorentz-symmetry violation 临界磁场对违反洛伦兹对称性的标量中性玻色子成对产生的控制的影响
Europhysics Letters Pub Date : 2024-01-29 DOI: 10.1209/0295-5075/ad2946
A. G. Jirón Vicente, A. Obispo, Daniel Espinoza Loayza, Juan Carlos Quispe Huarcaya, Luis B. Castro
{"title":"Effect of a critical magnetic field on the control of scalar neutral boson pair production in the context of Lorentz-symmetry violation","authors":"A. G. Jirón Vicente, A. Obispo, Daniel Espinoza Loayza, Juan Carlos Quispe Huarcaya, Luis B. Castro","doi":"10.1209/0295-5075/ad2946","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2946","url":null,"abstract":"\u0000 This study investigates the production of neutral scalar boson pairs in static electromagnetic fields resulting from Lorentz-symmetry violation (LSV), with a focus on the parity-even sector of the CPT-even photon sector in the Standard Model Extension (SME). Utilizing a cross-configuration involving inhomogeneous static electric fields and homogeneous static magnetic fields, the analysis of the probability of bosons pair production identifies three different regimes determined by a critical magnetic field. Below the critical value, creation is exponentially suppressed; at the critical value, the number density of created bosons remains constant, and above the critical field, there is exponential amplification. This behavior prompts an additional investigation using von Neumann entanglement entropy to analyze fluctuations in the bosonic vacuum.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140489507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The formation of large aggregates by Brownian growth and the onset of a runaway process 通过布朗增长形成大聚集体以及失控过程的开始
Europhysics Letters Pub Date : 2024-01-26 DOI: 10.1209/0295-5075/ad2340
Ben Schubert, Jürgen Blum, Matthias Isensee, Noah S. Molinski, Adrian Pöppelwerth, Ingo von Borstel, R. Schräpler, D. Balapanov, Andrei Vedernikov
{"title":"The formation of large aggregates by Brownian growth and the onset of a runaway process","authors":"Ben Schubert, Jürgen Blum, Matthias Isensee, Noah S. Molinski, Adrian Pöppelwerth, Ingo von Borstel, R. Schräpler, D. Balapanov, Andrei Vedernikov","doi":"10.1209/0295-5075/ad2340","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2340","url":null,"abstract":"\u0000 In an experiment onboard a microgravity sounding rocket, we observed the growth of agglomerates consisting of μm-sized silica spheres under well-defined conditions. After an initial short charge-induced growth phase, the charge-neutralized agglomerates grew due to Brownian-motion induced collisions, first in an orderly fashion and thereafter, due to the temporal increase in particle concentration, in a runaway process. The latter is characterized by the detachment of large oligarch agglomerates. We modeled the growth using a mean-field approximation as well as a Monte Carlo technique.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"49 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139594713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Variable brane tension and dark energy 可变鹤膜张力与暗能量
Europhysics Letters Pub Date : 2024-01-26 DOI: 10.1209/0295-5075/ad233f
Naman Kumar
{"title":"Variable brane tension and dark energy","authors":"Naman Kumar","doi":"10.1209/0295-5075/ad233f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad233f","url":null,"abstract":"\u0000 In this letter, we show that in a particular braneworld scenario with variable brane tension, we obtain matter acting as dark energy (in the sense that it has an effective Equation of State equivalent to that of dark energy) while a scalar field on the brane plays the role of matter. This result is interpreted from the Friedmann equation obtained from our model that exactly matches the standard Friedmann equation of General Relativity with a cosmological constant Λ in terms of the aforementioned quantities. The universe is assumed to consist of only matter and dark energy in this model which is a good approximation for our universe.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"31 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139595276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Orbital selectivity in Sn adatom adlayer on a Si(111) surface Si(111)表面锡金刚原子层的轨道选择性
Europhysics Letters Pub Date : 2024-01-23 DOI: 10.1209/0295-5075/ad219e
Luis Craco, S. S. Carara
{"title":"Orbital selectivity in Sn adatom adlayer on a Si(111) surface","authors":"Luis Craco, S. S. Carara","doi":"10.1209/0295-5075/ad219e","DOIUrl":"https://doi.org/10.1209/0295-5075/ad219e","url":null,"abstract":"\u0000 Unconventional quantum many-particle phenomena naturally emerges when approaching the Mott-Hubbard insulating state. Finding insulator-metal transition in correlated adatoms in semiconductor surfaces provide an ideal material platform to design electronic states which may host superconductivity in two-dimensional electron systems. To uncover the micro-scopics underlying by multi-orbital interactions, we perform density functional plus dynamical mean-field theory calculations for the all-electron 5p-band Hubbard model, unraveling a Mott assisted Kondo insulating state in the atomic Sn layer deposited onto a Si(111) surface, also referred to as α-Sn. We propose that α-Sn is an ideal testing ground to explore hidden orbital selectivity and pseudogap behavior all arising from Mottness and discuss the relevance of our results for pure and hole doped α-Sn in the context of spectroscopy and tunnelling experiments of adatom lattices.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"38 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139603548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-soliton solutions and soliton molecules of the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation for the incompressible fluid 不可压缩流体的 (2+1)-dimensional Boiti-Leonon-Manna-Pempinelli 方程的多孤子解和孤子分子
Europhysics Letters Pub Date : 2024-01-23 DOI: 10.1209/0295-5075/ad219d
Kang-Jia Wang, Feng Shi
{"title":"Multi-soliton solutions and soliton molecules of the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation for the incompressible fluid","authors":"Kang-Jia Wang, Feng Shi","doi":"10.1209/0295-5075/ad219d","DOIUrl":"https://doi.org/10.1209/0295-5075/ad219d","url":null,"abstract":"\u0000 The (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation (BLMPE) is explored in this letter. The multi-soliton solutions (MSSs) are probed via the Hirota bilinear form that is extracted by taking advantage of the Cole-Hopf transform. The soliton molecules (SMs) on the different planes such as the (x,y)-,(x,t)- and (y,t)- planes are investigated via assigning the velocity resonance mechanisms to the MSSs. The dynamic characteristics of the results are also unveiled graphically to show the corresponding physical behaviors.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"141 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139604667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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