Journal of Physics: Condensed Matter最新文献_第3页

Quantitative Phase Retrieval and Characterization of Magnetic Nanostructures via Lorentz (Scanning) Transmission Electron Microscopy.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adc6e3

Kayna Lee Mendoza, Haoyang Ni, Georgios Varnavides, Miaofang Chi, Colin Ophus, Amanda K Petford-Long, Charudatta Phatak

{"title":"Quantitative Phase Retrieval and Characterization of Magnetic Nanostructures via Lorentz (Scanning) Transmission Electron Microscopy.","authors":"Kayna Lee Mendoza, Haoyang Ni, Georgios Varnavides, Miaofang Chi, Colin Ophus, Amanda K Petford-Long, Charudatta Phatak","doi":"10.1088/1361-648X/adc6e3","DOIUrl":"https://doi.org/10.1088/1361-648X/adc6e3","url":null,"abstract":"Magnetic materials phase reconstruction using Lorentz transmission electron microscopy (LTEM) measurements have traditionally been achieved using longstanding methods such as off-axis holography (OAH) fast-Fourier transform (FFT) technique and the transport-of-intensity equation (TIE). The increase in access to processing power alongside the development of advanced algorithms have allowed for phase retrieval of nanoscale magnetic materials with greater efficacy and resolution. Specifically, reverse-mode automatic differentiation (RMAD) and the extended electron ptychography iterative engine (ePIE) are two recent developments of phase retrieval that can be applied to analyzing micro-to-nano- scale magnetic materials. This work evaluates phase retrieval using TIE, RMAD, and ePIE in simulations of Permalloy (Ni(_{80})Fe(_{20})) nanoscale islands, or nanomagnets. Extending beyond simulations, we demonstrate total phase retrieval and image reconstructions of a NiFe nanowire using OAH and RMAD in LTEM and ePIE in Ltz-4D-STEM experiments and determine the saturation magnetization through corroborations with micromagnetic modeling.Finally, we demonstrate the efficacy of these methods in retrieving the total phase and highlight its use in characterizing and analyzing the proximity effect of the magnetic nanostructures.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143743018","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

Addendum: Microscopic dynamics and Bose-Einstein condensation in liquid helium (2023J. Phys.: Condens. Matter35085101).

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adc063

K Trachenko

引用次数: 0

Magnetic properties and electronic structure ofJ_eff= 1/2 square lattice quantum magnet Bi₂ErO₄Cl.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adc6e5

Vaibhav Kumar Singh, Seong-Hoon Kim, Ki Wan Nam, Uma Jena, Boya Krishnamraju, Panchanan Khuntia, Edwin Kermarrec, Kee Hoon Kim, Sayantika Bhowal, Koteswararao Bommisetti

{"title":"Magnetic properties and electronic structure ofJeff= 1/2 square lattice quantum magnet Bi2ErO4Cl.","authors":"Vaibhav Kumar Singh, Seong-Hoon Kim, Ki Wan Nam, Uma Jena, Boya Krishnamraju, Panchanan Khuntia, Edwin Kermarrec, Kee Hoon Kim, Sayantika Bhowal, Koteswararao Bommisetti","doi":"10.1088/1361-648X/adc6e5","DOIUrl":"https://doi.org/10.1088/1361-648X/adc6e5","url":null,"abstract":"Two-dimensional rare-earth-based square lattice quantum magnets provide a pathway to achieve distinctive ground states characterized by unusual excitations. We investigate the magnetic, heat capacity, structural, and electronic properties of a magnetic system Bi2ErO4Cl. This compound features a structurally ideal two-dimensional square lattice composed of Er3+rare-earth magnetic ions. The single-phase polycrystalline sample was synthesized using hydrothermal, followed by a vacuum-sealed tube technique. The analysis of heat capacity and magnetic data indicates that the Er3+ion adopts aJeff= 1/2 state at low temperatures. Fitting the Curie-Weiss law to the low-temperature magnetic susceptibility data reveals a Curie-Weiss temperature of approximately -2.1 K, suggesting antiferromagnetic (AFM) interactions between the Er3+moments. Our first-principles calculations validate a two-dimensional spin model relevant to the titled Er compound. The presence of AFM interaction between the Er3+ions is further confirmed using total energy calculations (LDA+U), aligning with the experimental results. The heat capacity measurements reveal the presence of magnetic long-range orderbelowTN= 0.47 K. The magnetic heat capacity data followsT1.8power lawdependence belowTN.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143742966","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

A primer on Kitaev Model: Basic aspects, material realization, and recent experiments.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adc6e6

Saptarshi Mandal

引用次数: 0

The physical origin of electric polarizations in two dimensional ferroelectric monolayer materials.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adc6e0

Xiao-Feng Luo, Zhuo-Peng Xia, Jin-Zhu Zhao

{"title":"The physical origin of electric polarizations in two dimensional ferroelectric monolayer materials.","authors":"Xiao-Feng Luo, Zhuo-Peng Xia, Jin-Zhu Zhao","doi":"10.1088/1361-648X/adc6e0","DOIUrl":"https://doi.org/10.1088/1361-648X/adc6e0","url":null,"abstract":"Over the past decade, a new class of ferroelectric materials with atomic-level thickness, particularly monolayer materials, has been predicted theoretically and confirmed experimentally. These two-dimensional ferroelectric materials, especially those exhibiting finite out-of-plane polarizations, have garnered significant attention in both condensed matter physics and materials science. On one hand, they offer promising avenues for the miniaturization of ferroelectric devices. On the other hand, they reveal novel physical mechanisms that go beyond those found in conventional bulk ferroelectrics, enabling the emergence of out-of-plane polarization under depolarization fields. Recent studies have identified various mechanisms capable of generating out-of-plane polarization in monolayers, a phenomenon previously considered unlikely in traditional bulk materials like ferroelectric perovskites. This review article highlights the recent advancements in understanding two-dimensional ferroelectricity in monolayer candidates. We focus primarily on the exploration of these unique mechanisms, as investigated and rationalized in recent years. Furthermore, we discuss the promising prospects in this emerging field of ferroelectricity and the bright future of two-dimensional monolayer materials.&#xD.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143743024","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

Structure and dynamics of phytantriol-glycerol mesophases: insights into the reverse micelle to lamellar phase transition.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adbeae

Matteo Rutsch, Yang Yao

{"title":"Structure and dynamics of phytantriol-glycerol mesophases: insights into the reverse micelle to lamellar phase transition.","authors":"Matteo Rutsch, Yang Yao","doi":"10.1088/1361-648X/adbeae","DOIUrl":"10.1088/1361-648X/adbeae","url":null,"abstract":"Lipidic mesophases (LMPs) are lyotropic liquid crystals formed by the self-assembly of lipid in water, offering diverse phase symmetries with unique physicochemical properties. However, a fundamental understanding of how the dynamics relate to the composition and structure remains limited. In this study, we substitute water with glycerol, which closely resembles the headgroup structure of phytantriol, as the solvent to explore phytantriol-based LMPs in a pure glycerol environment. The non-crystallizing nature of both phytantriol and glycerol enables phase studies at sub-zero temperatures. Combined small-angle x-ray scattering and differential scanning calorimetry analyses confirm the formation of reverse micelles (L2), which undergo a phase transition to lamellar phase (Lα) upon cooling. Broadband dielectric spectroscopy (BDS) reveals how the dynamics of phytantriol are governed by the composition and symmetry of the LMP: increased glycerol content decreases the relaxation time of the Debye- andα-relaxation, therefore exerting a plasticizing effect. The change in long-range order of phytantriol during theL2-Lαphase transition reveals a decrease of the conductivity relaxation time. The introduction of a net orientation of phytantriol further reveals a new relaxation process-the dipole-matrix interaction-exclusive to theLαphase. Our results highlight the value of combining BDS with structural and thermal analyses for a deeper understanding of the dynamics in soft matter systems.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143597243","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

Investigation of first-cycle voltage hysteresis in Li-rich cathode materials by magnetic Compton scattering experiments.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-28 DOI: 10.1088/1361-648X/adbf5c

Aierxiding Abulikemu, Tomoya Ando, Naruki Tsuji, Kosuke Suzuki, Manabu Takahashi, Tsuyoshi Takami, Hiroshi Sakurai

引用次数: 0

Prediction of high-T_csuperconductivity in two corrugated graphene sheets with intercalated CeH₉molecules.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-27 DOI: 10.1088/1361-648X/adc061

M A Rastkhadiv, M Pazoki

{"title":"Prediction of high-Tcsuperconductivity in two corrugated graphene sheets with intercalated CeH9molecules.","authors":"M A Rastkhadiv, M Pazoki","doi":"10.1088/1361-648X/adc061","DOIUrl":"10.1088/1361-648X/adc061","url":null,"abstract":"Recent discoveries involving high-temperature superconductivity in H3S and LaH10have sparked a renewed interest in exploring the potential for superconductivity within hydrides. These superconductors require extremely high-pressure condition (∼100GPa), rendering them virtually impractical for industrial applications. In this study, we verify the occurrence of a low pressure superconductivity phase transition in a system containing two graphene layers with sine form corrugations where CeH9doped molecules are intercalated between the layers. The lowest-order constrained variational method is applied to calculate the thermodynamic and electrical properties of the valence electrons. We examine 9900 different distributions of CeH9molecules separately for finding a second-order phase transition with maximized critical temperature. The novelty of the present work is the prediction of a superconductivity transition atTc=198.61 K for a specific distribution of CeH9molecules with applying no external pressure on the exterior surfaces of the graphene sheets. Notably, this critical temperature is approximately 65 K higher than that observed in cuprate materials (HgBa2Ca2Cu3O8+δ), which are known for their highTcvalues at room pressure. It is interesting that in this particular case, the distribution periodicity of CeH9molecules bears the closest resemblance to the periodicity of the graphene corrugations among all 9900 examined cases. Computing the energy gap of the valence electrons reveals that this critical behavior corresponds to an unconventional superconductivity phase transition exhibiting a high critical current density on the order of∼107A cm-2.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143625041","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

Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-27 DOI: 10.1088/1361-648X/adc648

J C Bellizotti Souza, Nicolas Vizarim, Cynthia J Olson Reichhardt, Charles Reichhardt, Pablo Venegas

引用次数: 0

The initial stages of silver fluorination: a scanning tunnelling microscopy investigation.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-03-27 DOI: 10.1088/1361-648X/adc649

Jazmin Aragon Sanchez, Antonio Caporale, Ilya Degtev, Luciana Di Gaspare, Luca Persichetti, Maurizio Sansotera, Adrián Gómez Pueyo, Monica De Seta, Jose Lorenzana, Luca Camilli

{"title":"The initial stages of silver fluorination: a scanning tunnelling microscopy investigation.","authors":"Jazmin Aragon Sanchez, Antonio Caporale, Ilya Degtev, Luciana Di Gaspare, Luca Persichetti, Maurizio Sansotera, Adrián Gómez Pueyo, Monica De Seta, Jose Lorenzana, Luca Camilli","doi":"10.1088/1361-648X/adc649","DOIUrl":"https://doi.org/10.1088/1361-648X/adc649","url":null,"abstract":"We use low-temperature scanning tunnelling microscopy (LT-STM) to characterize the early stages of silver fluorination. On Ag(100), we observe only one adsorbate species, which shows a bias-dependent STM topography. Notably, at negative bias voltages, VB < 0, the apparent shape can be described as a round protrusion surrounded by a moat-like depression (sombrero). As the voltage increases, the apparent shape changes, eventually evolving into a round depression. From the STM images, we determine the adsorption site to be the hollow position. On Ag(110) we find adsorbates with three distinct STM topographies. One type exhibits the same shape change with VB as observed on Ag(100), that is, from a sombrero shape to a round depression as the voltage changes from negative to positive values; the other two types are observed as round depressions regardless of VB. From the STM images, we find the three adsorbates to be sitting on the short-bridge, hollow and top position on the Ag(110) surface, with a relative abundance of 60%, 35% and 5.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730602","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