Science China Physics, Mechanics & Astronomy最新文献_第8页

A stringent constraint on the fractional change of proton g-factor 质子g因子分数变化的严格约束

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-11 DOI: 10.1007/s11433-025-2863-7

Renzhi Su, Stephen J. Curran, Jeremy Darling, Minfeng Gu, J. N. H. S. Aditya, Ningyu Tang, Di Li, Zheng Zheng

引用次数: 0

A geometrically characteristic and thermodynamically consistent theory to formulate the plasticity and damage of metallic solids at large deformation 描述金属固体大变形时的塑性和损伤的几何特征和热力学一致的理论

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-10 DOI: 10.1007/s11433-025-2892-7

Wenpei Yu, Yichao Zhu, Chunyu Zhang, Biao Wang

{"title":"A geometrically characteristic and thermodynamically consistent theory to formulate the plasticity and damage of metallic solids at large deformation","authors":"Wenpei Yu, Yichao Zhu, Chunyu Zhang, Biao Wang","doi":"10.1007/s11433-025-2892-7","DOIUrl":"10.1007/s11433-025-2892-7","url":null,"abstract":"<div>A geometrically characteristic and thermodynamically consistent theory is proposed to describe the full-life mechanics of metallic solids undergoing large deformation. The theory is geometrically characteristic in the sense that the inelastic deformation caused by various crystalline defects is decomposed into a deviatoric part, a volumetric part, and a geometrically insensitive part, and the system thermodynamics is then formulated. The theory reaches its closure by including a finite-strain plastic flow rule originating from the postulate of maximum dissipation, and a set of thermodynamically consistent kinetic equations for the geometrically characteristic field quantities. The present theory is distinguished from existing ductile damage models in the following aspects. Firstly, the proposed geometrically characteristic measure of plasticity is conceptually valid throughout the whole deformation stage, enabling the calibration of the present theory simply against uniaxial loading data. Secondly, the stress calculation here is shown to be unconditionally convergent, and this is in contrast to the use of incremental tangent stiffness matrices whose eigenvalues inevitably turn negative in the softening stage. Thirdly, the anisotropic hardening behaviour can be modelled with low calibration requirements.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Enhanced Curie temperature and room-temperature 50-nm skyrmions achieved in hexagonal ferromagnet Mn5Ge3.2 synthesized via a high-pressure method 高压法合成的六方铁磁体Mn5Ge3.2获得了更高的居里温度和室温50 nm的天介子

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-09 DOI: 10.1007/s11433-025-2860-4

Yongsen Zhang, Wei Liu, Meng Shi, Shuisen Zhang, Sheng Qiu, Yaodong Wu, Jialiang Jiang, Huanhuan Zhang, Hui Han, Kang Wang, Dingfu Shao, Zhenfa Zi, Chao Ma, Haifeng Du, Mingliang Tian, Shouguo Wang, Jin Tang

{"title":"Enhanced Curie temperature and room-temperature 50-nm skyrmions achieved in hexagonal ferromagnet Mn5Ge3.2 synthesized via a high-pressure method","authors":"Yongsen Zhang, Wei Liu, Meng Shi, Shuisen Zhang, Sheng Qiu, Yaodong Wu, Jialiang Jiang, Huanhuan Zhang, Hui Han, Kang Wang, Dingfu Shao, Zhenfa Zi, Chao Ma, Haifeng Du, Mingliang Tian, Shouguo Wang, Jin Tang","doi":"10.1007/s11433-025-2860-4","DOIUrl":"10.1007/s11433-025-2860-4","url":null,"abstract":"<div>The development of new high-temperature ultrasmall-size skyrmion materials holds immense significance for the promising applications of topological spintronic devices. In this study, we demonstrate that a high-pressure synthesis technique can significantly elevate the Curie temperature of Mn5Ge3.2 crystals, from 294 to 350 K. It is possible that this enhancement arises from the combined effects of lattice contraction and increased Ge content, a conclusion supported by our Density Functional Theory calculations. Additionally, our real-space magnetic imaging reveals the stability of dipolar skyrmions with diameters of approximately 50 nm at room temperature and zero magnetic field. Our micromagnetic simulations closely replicate the diverse experimental topological magnetic textures observed. Furthermore, magnetotransport measurements indicate the potential for the electrical distinction between various topological magnetic textures in skyrmion-based devices. We also report deterministic manipulations on single dipolar skyrmions in confined nanostructures by using in-plane currents. The observation, electrical manipulation, and electrical detection of room-temperature ultrasmall topological magnetic textures underscore the potential of Mn5Ge3.2 as a promising platform for spintronic device applications.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

The spontaneous genesis of solar prominence structures driven by supergranulation in three-dimensional simulations 三维模拟中由超粒驱动的日珥结构的自发形成

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-09 DOI: 10.1007/s11433-025-2858-5

Huanxin Chen, Chun Xia, Hechao Chen

{"title":"The spontaneous genesis of solar prominence structures driven by supergranulation in three-dimensional simulations","authors":"Huanxin Chen, Chun Xia, Hechao Chen","doi":"10.1007/s11433-025-2858-5","DOIUrl":"10.1007/s11433-025-2858-5","url":null,"abstract":"<div>Solar prominences usually have a horizontally elongated body with many feet extending to the solar surface, resembling a multi-arch bridge with many bridge piers. The basic mechanism by which solar prominences acquire these common structures during their evolution, however, remains an unresolved question. For the first time, our three-dimensional magneto-frictional simulation, driven by supergranular motions, self-consistently replicates the commonly observed multi-arch bridge morphology and its characteristic structures of solar quiescent prominences in a magnetic flux rope. In comparison with traditional views, our simulations demonstrate that the spine, feet, and voids (bubbles) are inherent prominence structures spontaneously forming as the flux rope evolves to a mature state. The voids mainly consist of legs of sheared magnetic loops caused by unbalanced supergranular flows, and prominence feet settle at the bottom of helical field lines piled up from the photosphere to the spine. Similarities between the simulated prominences and observed real prominences by the Chinese Hα Solar Explorer, the New Vacuum Solar Telescope, and NASA’s Solar Dynamics Observatory suggest the high validity of our model. This work corroborates the pivotal role of photospheric supergranulation as a helicity injection source in the formation and shaping of quiescent prominence structures within the solar atmosphere, thereby paving a new avenue for future investigations into their fine dynamics and stability.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Pairing mechanism and superconductivity in pressurized La5Ni3O11 加压La5Ni3O11的配对机制和超导性

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-06 DOI: 10.1007/s11433-025-2907-0

Ming Zhang, Cui-Qun Chen, Dao-Xin Yao, Fan Yang

{"title":"Pairing mechanism and superconductivity in pressurized La5Ni3O11","authors":"Ming Zhang, Cui-Qun Chen, Dao-Xin Yao, Fan Yang","doi":"10.1007/s11433-025-2907-0","DOIUrl":"10.1007/s11433-025-2907-0","url":null,"abstract":"<div>The discovery of superconductivity (SC) with critical temperature Tc above the boiling point of liquid nitrogen in pressurized La3Ni2O7 has sparked a surge of exploration of high-Tc superconductors in the Ruddlesden-Popper (RP) phase nickelates. More recently, the RP phase nickelate La5Ni3O11, which hosts a layered structure with alternating bilayer and single-layer NiO2 planes, has been reported to accommodate SC under pressure, exhibiting a dome-shaped pressure dependence with the highest Tc ≈ 64 K, capturing a lot of interest. Here, using density functional theory (DFT) and random phase approximation (RPA) calculations, we systematically study the electronic properties and superconducting mechanism of this material. Our DFT calculations yield a band structure including two nearly decoupled sets of sub-band structures, with one set originating from the bilayer subsystem and the other from the single-layer one. RPA-based analysis demonstrates that SC in this material occurs primarily within the bilayer subsystem exhibiting an s± wave pairing symmetry similar to that observed in pressurized La3Ni2O7, while the single-layer subsystem mainly serves as a bridge facilitating the inter-bilayer phase coherence through the interlayer Josephson coupling (IJC). Since the IJC thus attained is extremely weak, it experiences a prominent enhancement under pressure, leading to the increase of the bulk Tc with pressure initially. When the pressure is high enough, the Tc gradually decreases due to the reduced density of states on the γ-pocket. In this way, the dome-shaped pressure dependence of Tc observed experimentally is naturally understood.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 5","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147363234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Deep learning extraction of overlapping galactic compact binaries and EMRI gravitational waves by coupling of ensemble separation and recursive reasoning methods 基于集合分离和递归推理方法的深度学习提取重叠星系致密双星和EMRI引力波

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-06 DOI: 10.1007/s11433-025-2868-y

Cunliang Ma, Yibin Xie, Zhoujian Cao, Zimo Lu

{"title":"Deep learning extraction of overlapping galactic compact binaries and EMRI gravitational waves by coupling of ensemble separation and recursive reasoning methods","authors":"Cunliang Ma, Yibin Xie, Zhoujian Cao, Zimo Lu","doi":"10.1007/s11433-025-2868-y","DOIUrl":"10.1007/s11433-025-2868-y","url":null,"abstract":"<div>Among the rich spectrum of GW sources, galactic compact binaries (GCBs) and extreme mass-ratio inspirals (EMRIs) stand out as crucial targets for space-based detectors. GCBs pose challenges in signal extraction due to their overlapping nature. This paper introduces a deep learning framework designed to separate overlapping GCB and EMRI GW signals. The framework employs a two-stage approach: initially, we consider the mixed GCB waveforms as an ensemble, and an ensemble separation method is utilized to separate the mixed GCBs and EMRI signals; subsequently, a recursive reasoning process is applied to further isolate individual GCB signals from the mixed GCB ensemble. We demonstrate the model’s robust performance across varying signal-to-noise ratios (SNRs) and overlapping signal counts. The framework exhibits high separation fidelity, particularly for the ensemble separation stage, with overlap metrics exceeding 0.998 under the same parameter ranges of the training set, thereby ensuring accurate signal extraction for subsequent recursive reasoning. For the recursive reasoning process, we have empirically demonstrated that the deep learning framework is capable of effectively separating mixed GCB GW signals even when the frequency differences between them are near or marginally below the frequency resolution limit. We have also observed that the proposed framework exhibits generalization capabilities when applied to GW strain data characterized by lower SNR ranges and larger numbers of mixed GCB signals.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 concentration fluctuations on material properties of disordered alloys 浓度波动对无序合金材料性能的影响

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-06 DOI: 10.1007/s11433-025-2885-3

Han-Pu Liang, Chuan-Nan Li, Xin-Ru Tang, Xun Xu, Chen Qiu, Qiu-Shi Huang, Su-Huai Wei

{"title":"Effect of concentration fluctuations on material properties of disordered alloys","authors":"Han-Pu Liang, Chuan-Nan Li, Xin-Ru Tang, Xun Xu, Chen Qiu, Qiu-Shi Huang, Su-Huai Wei","doi":"10.1007/s11433-025-2885-3","DOIUrl":"10.1007/s11433-025-2885-3","url":null,"abstract":"<div>Alloying compound AX with another compound BX is widely used to tune material properties. For disordered alloys, due to the lack of periodicity, it has been challenging to calculate and study their material properties. The Special quasi-random structure (SQS) method has been developed and widely used to treat this issue by matching averaged atomic correlation functions to those of ideal random alloys, enabling accurate predictions of macroscopic material properties such as total energy and volume. However, in AxB1−x alloys, statistically allowed local concentration fluctuations can give rise to defect-like minority configurations, such as bulk-like AX or BX regions in the extreme, which could strongly affect calculation of some of the material properties such as semiconductor bandgap, if it is not defined properly, leading to significant discrepancies between theory and experiment. In this work, taking the bandgap as an example, we demonstrate that the calculated alloy bandgap can be significantly underestimated in standard SQS calculations when the SQS cell size is increased to improve the structural model and the bandgap is defined conventionally as the energy difference between the lowest unoccupied state and the highest occupied state, because the rare event motifs can lead to wavefunction localization and become the dominant factor in determining the “bandgap”, contrary to experiment. To be consistent with the experiment, we show that the bandgap of the alloy should be extracted from the majority configurations using a density-of-states fitting (DOSF) method. This DOSF approach resolves the long-standing issue of calculating the electronic structure of disordered semiconductor alloys. Similar approaches should also be developed to treat material properties that depend on localized alloy wavefunctions.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Effective spin-spin coupling in magnon-polarons toward acoustic-assisted probing of magnetic domains 磁非极化子中有效的自旋-自旋耦合对磁畴的声学辅助探测

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-05 DOI: 10.1007/s11433-025-2884-7

Chongzhou Wang, Chensong Hua, Weichao Yu

{"title":"Effective spin-spin coupling in magnon-polarons toward acoustic-assisted probing of magnetic domains","authors":"Chongzhou Wang, Chensong Hua, Weichao Yu","doi":"10.1007/s11433-025-2884-7","DOIUrl":"10.1007/s11433-025-2884-7","url":null,"abstract":"<div>We develop an effective spin-spin coupling framework to describe magnon-phonon hybridization in magnetoelastic systems, where both quasiparticles carry intrinsic spin angular momentum. The strength of the magnon-polaron anticrossing is shown to depend explicitly on the relative orientation of magnon and phonon spins, providing a unified framework for understanding chiral coupling. To validate this theory, we introduce a self-consistent frequency-domain micromagnetic simulation method incorporating full magnetoelastic coupling, which efficiently captures the dispersion and excitation dynamics of hybrid modes with excellent agreement between numerical and analytical results. Based on the polarization-selective magnon excitation governed by magnon-phonon spin alignment, we propose a scheme for acoustic-assisted probing of magnetic domains by exploiting polarization-controlled elastic waves. This work offers a new perspective for spin mechanics, where the spin degrees of freedom of both phonons and magnons are treated on equal footing, revealing their joint role in mediating coherent magnetoelastic couplings.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Non-reciprocal coupling induced chaotic states in nonlinear optical model 非线性光学模型中的非互易耦合混沌态

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-05 DOI: 10.1007/s11433-025-2886-3

Penghong Yu, Juan Chen, Luojia Wang, Yanyan He, Xiaoxiong Wu, Zhaohui Dong, Xianfeng Chen, Luqi Yuan

引用次数: 0

Evolution of structure and density wave order in La3Ni2O7−δ single crystals at ambient pressure La3Ni2O7−δ单晶在常压下的结构演化与密度波序

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-05 DOI: 10.1007/s11433-025-2883-5

Kaibao Fan, Mengzhu Shi, Zhiwei Wang, Houpu Li, Mei Du, Xianhui Chen

{"title":"Evolution of structure and density wave order in La3Ni2O7−δ single crystals at ambient pressure","authors":"Kaibao Fan, Mengzhu Shi, Zhiwei Wang, Houpu Li, Mei Du, Xianhui Chen","doi":"10.1007/s11433-025-2883-5","DOIUrl":"10.1007/s11433-025-2883-5","url":null,"abstract":"<div>The recent discovery of high-temperature superconductivity in bilayer nickelate La3Ni2O7−δ single crystals under high pressure has sparked significant interest in the correlated electronic physics and unconventional pairing mechanisms within Ruddlesden-Popper phase nickelates, where the oxygen content plays a crucial role in both structure and superconductivity. Here we report the evolution of the structure and density wave order in La3Ni2O7−δ single crystals at ambient pressure under various oxygen annealing conditions. Structural analysis reveals that with the increase of annealing oxygen pressure, La3Ni2O7−δ undergoes a structural phase transition from an orthorhombic to a tetragonal phase. Magnetic torque measurements indicate that the density wave order, present in the orthorhombic phase, vanishes upon transition to the tetragonal structure, accompanied by an abrupt change in carrier concentration. A phase diagram illustrating the dependence of both the crystal structure and density wave order on the annealing oxygen pressure is mapped. Our findings suggest a promising pathway for studying the interplay between structure, density wave order, and superconductivity in bulk nickel-based materials.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 4","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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