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Anomalous metallic conductivity and short-range ferromagnetic correlation in high-pressure synthesized pyrochlore Hg2Ir2O7 高压合成热绿石 Hg2Ir2O7 中的反常金属导电性和短程铁磁相关性
Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2872
Jianfa Zhao, Zhenghao Deng, Jun Zhang, Yi Peng, Luchuan Shi, B. Min, Lei Duan, Wenmin Li, Lipeng Cao, J. Chen, Zhiwei Hu, R. Yu, Changqing Jin
Iridates show fascinating properties due to the unpredictable ground states of their Ir cations. Generally, Ir5+(5d4) systems exhibit insulating nonmagnetic states owing to the strong spin-orbit coupling (SOC). Herein a new pyrochlore iridates Hg2Ir2O7 with an Ir5+ charge state synthesized by high-pressure technique is reported. Hg2Ir2O7 crystallizes in the typical cubic pyrochlore crystal structure. The Ir5+ valence state is evidenced by the XAS spectrum. Surprisingly, Hg2Ir2O7 displays short-range ferromagnetic correlations at low temperatures as evidenced by S-shape field-dependent magnetization curves, positive magnetoresistance, and magnetic excitations in specific heat. Furthermore, it also shows metallic conduction and large electron component of specific heat. These results all indicate that Ir5+ in Hg2Ir2O7 deviates from SOC-dominated insulating nonmagnetic states.
铱酸盐因其铱阳离子不可预测的基态而显示出迷人的特性。一般来说,Ir5+(5d4) 体系由于具有很强的自旋轨道耦合(SOC)而表现出绝缘的非磁性态。本文报道了一种通过高压技术合成的具有 Ir5+ 电荷态的新型热绿石铱化物 Hg2Ir2O7。Hg2Ir2O7 结晶为典型的立方热长石晶体结构。XAS 光谱证明了其 Ir5+ 价态。令人惊讶的是,Hg2Ir2O7 在低温下显示出短程铁磁相关性,这表现在 S 型磁场相关磁化曲线、正磁阻和比热激磁。此外,它还显示出金属传导性和比热中的大电子分量。这些结果都表明,Hg2Ir2O7 中的 Ir5+ 偏离了以 SOC 为主导的绝缘非磁态。
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引用次数: 0
Asymmetric acoustic splitting with the dual-layers of binary metagratings 双层二元晶格的非对称声学分裂
Pub Date : 2024-02-12 DOI: 10.1209/0295-5075/ad2870
Zhengang Liu, Shuai Chang, Shibei Xue, Fangfang Ju, Shengyou Qian
Here, we exhibit the asymmetric acoustic splitting with the dual-layers of binary metagratings (BMs), i.e., BM1 and BM2. For the positive incidence (PI) normally from the BM1 side, acoustic waves are freely transmitted through the BM1 and split into two beams with the transmitted angles at θt = 45º and θt =−45º, then the two beams are freely transmitted through the BM2 with the transmitted angles at θt =−45º and θt = 45º. For the negative incidence (NI) normally from the BM2 side, acoustic waves are wholly reflected. Hence, the asymmetric acoustic splitting is observed. Here, the dual-layers of BMs are exemplified by the coating cells with different period lengths. Excellent agreement can be observed between the numerical simulations and the theoretical analysis. Our proposal may be applied in noise control and acoustic communication. Keywords: Acoustic asymmetric splitting, binary metagrating
在这里,我们展示了双层双元层(即 BM1 和 BM2)的不对称声波分裂。在正入射(PI)情况下,声波通常从 BM1 一侧自由穿过 BM1,并分裂成两束声波,传播角度分别为 θt = 45º 和 θt = 45º,然后两束声波又自由穿过 BM2,传播角度分别为 θt = 45º 和 θt = 45º。对于通常从 BM2 一侧的负入射角 (NI),声波被完全反射。因此,可以观察到不对称的声波分裂。在这里,双层 BM 由具有不同周期长度的涂层单元来举例说明。数值模拟结果与理论分析结果非常吻合。我们的建议可应用于噪声控制和声学通信。关键词声学不对称分裂、二元元晶
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引用次数: 0
Probing the angular distribution of terrestrial cosmic-ray nuclei 探测地球宇宙射线核的角度分布
Pub Date : 2024-02-09 DOI: 10.1209/0295-5075/ad27f2
R. Sedrati, Reda Attallah, Dallel Bouchachi
Understanding how atmospheric cosmic rays are distributed on Earth is crucial for simulating cosmic ray setups and detectors for rare event detection. The accuracy and reliability of such simulations and experiments depend on obtaining this information. This study focuses on analyzing the impact of key parameters in the PARMA model on the angular distributions of terrestrial cosmic ray nuclei. These parameters include geomagnetic cutoff rigidity, atmospheric depth and solar activity. Moreover, angular distributions of various particles, including protons, electrons, neutrons, and muons, were systematically calculated over relevant rigidities, solar modulations, and altitudes. For this purpose, the latest version of the Excel-based Program for calculating Atmospheric Cosmic-ray Spectrum EXPACS (v.4.13), which relies on updated experimental data, was used. The results of the calculations showed clear trends in the angular distributions of all cosmic ray species as a function of the model parameters. These findings provide valuable insights into the dynamics of cosmic rays in our solar system. Moreover, they can contribute to developing more accurate models for predicting the distribution of cosmic rays on Earth’s surface.
了解大气宇宙射线在地球上的分布情况,对于模拟宇宙射线装置和探测罕见事件的探测器至关重要。这些模拟和实验的准确性和可靠性取决于能否获得这些信息。本研究主要分析 PARMA 模型中关键参数对地球宇宙射线核角度分布的影响。这些参数包括地磁截止刚度、大气深度和太阳活动。此外,还系统地计算了各种粒子(包括质子、电子、中子和μ介子)在相关刚度、太阳调制和高度上的角度分布。为此,使用了基于最新实验数据的 Excel 大气宇宙射线频谱计算程序 EXPACS(v.4.13)的最新版本。计算结果显示,所有宇宙射线种类的角度分布与模型参数的函数关系趋势明显。这些发现为了解太阳系中宇宙射线的动力学提供了宝贵的见解。此外,它们还有助于开发更精确的模型来预测宇宙射线在地球表面的分布。
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引用次数: 0
Pair production by electromagnetic fields in a modified Robertson-Walker universe 改良罗伯逊-沃克宇宙中电磁场的成对作用
Pub Date : 2024-02-09 DOI: 10.1209/0295-5075/ad27f4
Kenan Sogut, M. Salti, O. Aydoğdu
We investigate the relativistic quantum dynamics of the spinless particles in a Robertson-Walker spacetime (RWS) in the framework of gravity’s rainbow (RG) when homogeneous electromagnetic fields exist. Exact solutions of the Klein-Gordon equation (KGE) are obtained and the amount of the created pairs is calculated by employing the Bogoliubov transformation method (BTM). The effects of homogeneous electromagnetic fields interacting with gravitational fields on particle production rate are discussed.
我们在重力虹(RG)框架内研究了存在同质电磁场时罗伯逊-沃克时空(RWS)中无自旋粒子的相对论量子动力学。研究获得了克莱因-戈登方程(KGE)的精确解,并利用波哥留布夫变换方法(BTM)计算了所产生的粒子对的数量。讨论了同质电磁场与引力场相互作用对粒子生成率的影响。
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引用次数: 0
Pair production by electromagnetic fields in a modified Robertson-Walker universe 改良罗伯逊-沃克宇宙中电磁场的成对作用
Pub Date : 2024-02-09 DOI: 10.1209/0295-5075/ad27f4
Kenan Sogut, M. Salti, O. Aydoğdu
We investigate the relativistic quantum dynamics of the spinless particles in a Robertson-Walker spacetime (RWS) in the framework of gravity’s rainbow (RG) when homogeneous electromagnetic fields exist. Exact solutions of the Klein-Gordon equation (KGE) are obtained and the amount of the created pairs is calculated by employing the Bogoliubov transformation method (BTM). The effects of homogeneous electromagnetic fields interacting with gravitational fields on particle production rate are discussed.
我们在重力虹(RG)框架内研究了存在同质电磁场时罗伯逊-沃克时空(RWS)中无自旋粒子的相对论量子动力学。研究获得了克莱因-戈登方程(KGE)的精确解,并利用波哥留布夫变换方法(BTM)计算了所产生的粒子对的数量。讨论了同质电磁场与引力场相互作用对粒子生成率的影响。
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引用次数: 0
Probing the angular distribution of terrestrial cosmic-ray nuclei 探测地球宇宙射线核的角度分布
Pub Date : 2024-02-09 DOI: 10.1209/0295-5075/ad27f2
R. Sedrati, Reda Attallah, Dallel Bouchachi
Understanding how atmospheric cosmic rays are distributed on Earth is crucial for simulating cosmic ray setups and detectors for rare event detection. The accuracy and reliability of such simulations and experiments depend on obtaining this information. This study focuses on analyzing the impact of key parameters in the PARMA model on the angular distributions of terrestrial cosmic ray nuclei. These parameters include geomagnetic cutoff rigidity, atmospheric depth and solar activity. Moreover, angular distributions of various particles, including protons, electrons, neutrons, and muons, were systematically calculated over relevant rigidities, solar modulations, and altitudes. For this purpose, the latest version of the Excel-based Program for calculating Atmospheric Cosmic-ray Spectrum EXPACS (v.4.13), which relies on updated experimental data, was used. The results of the calculations showed clear trends in the angular distributions of all cosmic ray species as a function of the model parameters. These findings provide valuable insights into the dynamics of cosmic rays in our solar system. Moreover, they can contribute to developing more accurate models for predicting the distribution of cosmic rays on Earth’s surface.
了解大气宇宙射线在地球上的分布情况,对于模拟宇宙射线装置和探测罕见事件的探测器至关重要。这些模拟和实验的准确性和可靠性取决于能否获得这些信息。本研究主要分析 PARMA 模型中关键参数对地球宇宙射线核角度分布的影响。这些参数包括地磁截止刚度、大气深度和太阳活动。此外,还系统地计算了各种粒子(包括质子、电子、中子和μ介子)在相关刚度、太阳调制和高度上的角度分布。为此,使用了基于最新实验数据的 Excel 大气宇宙射线频谱计算程序 EXPACS(v.4.13)的最新版本。计算结果显示,所有宇宙射线种类的角度分布与模型参数的函数关系趋势明显。这些发现为了解太阳系中宇宙射线的动力学提供了宝贵的见解。此外,它们还有助于开发更精确的模型来预测宇宙射线在地球表面的分布。
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引用次数: 0
Weak gravitational lensing by multi horizons black hole 多视界黑洞的弱引力透镜效应
Pub Date : 2024-02-07 DOI: 10.1209/0295-5075/ad2729
Farzan Mushtaq, Tiecheng Xia, Muhammad Yasir, Aitazaz Ahsan
We investigate the weak gravitational lensing caused by multi horizon black hole (MHBH) on light. Using the Gauss-Bonnet theorem, which demonstrates that light bending is a topological and global phenomenon, we are able to deduce the deflection angle of light in the weak field limits. First, we use the Gauss-Bonnet theorem to estimate the Gaussian optical curvature and determine the MHBH deflection angle for spherically balanced spacetime. Further, we evaluate the deflection angle of light within the plasma medium framework. Likewise, the impact of plasma and the non-plasma medium clearly illustrate the dynamics of the deflection angle by multi horizons black hole. Keywords: Weak gravitational lensing; deflection angle; Gauss-Bonnet theorem.
我们研究了多视界黑洞(MHBH)对光的弱引力透镜作用。高斯-波内定理证明了光的弯曲是一种拓扑和全局现象,利用该定理,我们能够推导出光在弱场极限下的反射角。首先,我们利用高斯-波内定理估算高斯光学曲率,并确定球面平衡时空的 MHBH 视角。此外,我们还在等离子体介质框架内评估了光的反射角。同样,等离子体介质和非等离子体介质的影响也清楚地说明了多视界黑洞脱射角的动态变化。关键词弱引力透镜;脱射角;高斯-波内特定理。
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引用次数: 0
Weak gravitational lensing by multi horizons black hole 多视界黑洞的弱引力透镜效应
Pub Date : 2024-02-07 DOI: 10.1209/0295-5075/ad2729
Farzan Mushtaq, Tiecheng Xia, Muhammad Yasir, Aitazaz Ahsan
We investigate the weak gravitational lensing caused by multi horizon black hole (MHBH) on light. Using the Gauss-Bonnet theorem, which demonstrates that light bending is a topological and global phenomenon, we are able to deduce the deflection angle of light in the weak field limits. First, we use the Gauss-Bonnet theorem to estimate the Gaussian optical curvature and determine the MHBH deflection angle for spherically balanced spacetime. Further, we evaluate the deflection angle of light within the plasma medium framework. Likewise, the impact of plasma and the non-plasma medium clearly illustrate the dynamics of the deflection angle by multi horizons black hole. Keywords: Weak gravitational lensing; deflection angle; Gauss-Bonnet theorem.
我们研究了多视界黑洞(MHBH)对光的弱引力透镜作用。高斯-波内定理证明了光的弯曲是一种拓扑和全局现象,利用该定理,我们能够推导出光在弱场极限下的反射角。首先,我们利用高斯-波内定理估算高斯光学曲率,并确定球面平衡时空的 MHBH 视角。此外,我们还在等离子体介质框架内评估了光的反射角。同样,等离子体介质和非等离子体介质的影响也清楚地说明了多视界黑洞脱射角的动态变化。关键词弱引力透镜;脱射角;高斯-波内特定理。
{"title":"Weak gravitational lensing by multi horizons black hole","authors":"Farzan Mushtaq, Tiecheng Xia, Muhammad Yasir, Aitazaz Ahsan","doi":"10.1209/0295-5075/ad2729","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2729","url":null,"abstract":"\u0000 We investigate the weak gravitational lensing caused by multi horizon black hole (MHBH) on light. Using the Gauss-Bonnet theorem, which demonstrates that light bending is a topological and global phenomenon, we are able to deduce the deflection angle of light in the weak field limits. First, we use the Gauss-Bonnet theorem to estimate the Gaussian optical curvature and determine the MHBH deflection angle for spherically balanced spacetime. Further, we evaluate the deflection angle of light within the plasma medium framework. Likewise, the impact of plasma and the non-plasma medium clearly illustrate the dynamics of the deflection angle by multi horizons black hole. Keywords: Weak gravitational lensing; deflection angle; Gauss-Bonnet theorem.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"23 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139797252","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
Reflective mode conversions between extensional and flexural waves by ultrathin oblique anisotropic tri-component resonators 超薄斜向各向异性三分量谐振器在延伸波和挠曲波之间的反射模式转换
Pub Date : 2024-02-06 DOI: 10.1209/0295-5075/ad26af
Fengyi Chen, Qiujiao Du, Fengming Liu, Pai Peng
In this letter, we report a theoretical study for the conversions between extensional and flexural modes for Lame waves. The incident extensional waves can be completely converted into reflected flexural waves, or vice versa. The used structure is oblique anisotropic tri-component resonators with locally dipolar resonators. Without special optimization designs, the thickness of conversion device is much smaller than the working wavelengths (1/150 and 1/15 for the extensional and flexural waves, respectively). Our proposed design is more feasible for low-frequency application scenarios.
在这封信中,我们报告了一项关于拉姆波的伸展模式和挠曲模式之间转换的理论研究。入射延伸波可以完全转换为反射挠曲波,反之亦然。所使用的结构是带有局部偶极谐振器的斜向各向异性三分量谐振器。如果没有特殊的优化设计,转换装置的厚度远小于工作波长(延伸波和挠曲波分别为 1/150 和 1/15)。我们提出的设计方案更适合低频应用场景。
{"title":"Reflective mode conversions between extensional and flexural waves by ultrathin oblique anisotropic tri-component resonators","authors":"Fengyi Chen, Qiujiao Du, Fengming Liu, Pai Peng","doi":"10.1209/0295-5075/ad26af","DOIUrl":"https://doi.org/10.1209/0295-5075/ad26af","url":null,"abstract":"\u0000 In this letter, we report a theoretical study for the conversions between extensional and flexural modes for Lame waves. The incident extensional waves can be completely converted into reflected flexural waves, or vice versa. The used structure is oblique anisotropic tri-component resonators with locally dipolar resonators. Without special optimization designs, the thickness of conversion device is much smaller than the working wavelengths (1/150 and 1/15 for the extensional and flexural waves, respectively). Our proposed design is more feasible for low-frequency application scenarios.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"32 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139861741","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
Reflective mode conversions between extensional and flexural waves by ultrathin oblique anisotropic tri-component resonators 超薄斜向各向异性三分量谐振器在延伸波和挠曲波之间的反射模式转换
Pub Date : 2024-02-06 DOI: 10.1209/0295-5075/ad26af
Fengyi Chen, Qiujiao Du, Fengming Liu, Pai Peng
In this letter, we report a theoretical study for the conversions between extensional and flexural modes for Lame waves. The incident extensional waves can be completely converted into reflected flexural waves, or vice versa. The used structure is oblique anisotropic tri-component resonators with locally dipolar resonators. Without special optimization designs, the thickness of conversion device is much smaller than the working wavelengths (1/150 and 1/15 for the extensional and flexural waves, respectively). Our proposed design is more feasible for low-frequency application scenarios.
在这封信中,我们报告了一项关于拉姆波的伸展模式和挠曲模式之间转换的理论研究。入射延伸波可以完全转换为反射挠曲波,反之亦然。所使用的结构是带有局部偶极谐振器的斜向各向异性三分量谐振器。如果没有特殊的优化设计,转换装置的厚度远小于工作波长(延伸波和挠曲波分别为 1/150 和 1/15)。我们提出的设计方案更适合低频应用场景。
{"title":"Reflective mode conversions between extensional and flexural waves by ultrathin oblique anisotropic tri-component resonators","authors":"Fengyi Chen, Qiujiao Du, Fengming Liu, Pai Peng","doi":"10.1209/0295-5075/ad26af","DOIUrl":"https://doi.org/10.1209/0295-5075/ad26af","url":null,"abstract":"\u0000 In this letter, we report a theoretical study for the conversions between extensional and flexural modes for Lame waves. The incident extensional waves can be completely converted into reflected flexural waves, or vice versa. The used structure is oblique anisotropic tri-component resonators with locally dipolar resonators. Without special optimization designs, the thickness of conversion device is much smaller than the working wavelengths (1/150 and 1/15 for the extensional and flexural waves, respectively). Our proposed design is more feasible for low-frequency application scenarios.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"24 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139801729","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
期刊
Europhysics Letters
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