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

Active learning-based automated construction of Hamiltonian for structural phase transitions: a case study on BaTiO₃. 基于主动学习的结构相变哈密顿自动构建：关于 BaTiO3 的案例研究。

IF 4.6 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-15 DOI: 10.1088/1361-648X/ad882a

Mian Dai, Yixuan Zhang, Nuno Fortunato, Peng Chen, Hongbin Zhang

引用次数: 0

Possible structures of skyrmion states in chiral ferromagnetic films with spatially modulated uniaxial anisotropy. 具有空间调制单轴各向异性的手性铁磁薄膜中的天电离状态的可能结构。

IF 4.6 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-15 DOI: 10.1088/1361-648X/ad8ea1

R M Vakhitov, A A Akhmetova, M A Filippov

引用次数: 0

Synthesis and characterization of p-CuO/n-ZnO heterostructured composite thin films for the detection of formaldehyde gas. 用于检测甲醛气体的 p-CuO/n-ZnO 异质结构复合薄膜的合成与表征。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-15 DOI: 10.1088/1361-648X/ad8f23

Sarika Yadav, P Nagaraju, Sameena Begum, M Swathi, Kurugundla Gopi Krishna, J K Ojha, G R Turpu

{"title":"Synthesis and characterization of p-CuO/n-ZnO heterostructured composite thin films for the detection of formaldehyde gas.","authors":"Sarika Yadav, P Nagaraju, Sameena Begum, M Swathi, Kurugundla Gopi Krishna, J K Ojha, G R Turpu","doi":"10.1088/1361-648X/ad8f23","DOIUrl":"10.1088/1361-648X/ad8f23","url":null,"abstract":"We report the synthesis and characterization of pure CuO and CuO-ZnO nanostructured composite thin films sprayed on particle-free glass substrates using chemical spray pyrolysis method. The films were systematically analyzed through microstructural, morphological, chemical, and gas-sensing studies. X-ray diffraction (XRD) studies confirmed the polycrystalline nature of the films, with a predominant monoclinic phase along the (002) direction. Key structural parameters, such as crystallite size, dislocation density, strain, and the number of crystallites per unit area, were reported from XRD analysis. Field emission scanning electron microscopy revealed a bundled-like morphology witha uniform particle distribution, enhancing the surface area for effective gas interaction. X-ray photoelectron spectroscopy results indicated that Cu and Zn ions existed predominantly in the 2+ oxidation state, contributing to the films' reactivity. Significantly, the gas sensing studies were investigated with static liquid distribution method, highlighting the remarkable performance of the 30 wt.% CuO-ZnO composite thin film. This composite exhibited a substantial response to 5 ppm formaldehyde at ambient conditions, showing a recovery time of 22 s and a response time of 15 s. These findings underscore the potential of CuO-ZnO composites for efficient formaldehyde gas sensing applications, marking a notable advancement in the field of environmental monitoring.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142581391","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

Spin injection from a magnetically near-compensated state in GdFeCo and inverse spin Hall eﬀect in electron-hole compensated metal YH₂. 钆铁钴（GdFeCo）中磁近补偿态的自旋注入以及电子-空穴补偿金属 YH2 中的逆自旋霍尔效应。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-15 DOI: 10.1088/1361-648X/ad9371

Ikuo Yamazaki, Yukihiro Koinuma, Tatsuro Hanajiri, Pham Van Van Thach, Sina Ranjbar, Satoshi Sumi, Hiroyuki Awano, Osamu Nakamura, Shigehiko Hasegawa, Masamichi Sakai

{"title":"Spin injection from a magnetically near-compensated state in GdFeCo and inverse spin Hall eﬀect in electron-hole compensated metal YH2.","authors":"Ikuo Yamazaki, Yukihiro Koinuma, Tatsuro Hanajiri, Pham Van Van Thach, Sina Ranjbar, Satoshi Sumi, Hiroyuki Awano, Osamu Nakamura, Shigehiko Hasegawa, Masamichi Sakai","doi":"10.1088/1361-648X/ad9371","DOIUrl":"https://doi.org/10.1088/1361-648X/ad9371","url":null,"abstract":"Rare-earth-transition-metal (RE-TM) ferrimagnets are excellent materials for spin encode/decode operations via spin transport in nonmagnetic regions. This superior performance stems from two key factors. First, the antiferromagnetic coupling between RE4f and TM3d sublattices reduces both the spin-transfer-torque switching time and inter-device magnetic-coupling. Second, the RE-TM ferrimagnets function as spin injectors/ejectors, with the TM3d sublattice solely responsible for carrier spin polarization (p), similar to conventional ferromagnetic metals. We performed spin transport experiments using the sign change of p in RE-TM, which exhibits a positive value above the magnetization compensation temperature and a negative value below it. We measured temperature dependencies of the transverse resistances (RT) of electron-hole compensated metal YH2under out-of-plane spin-polarized current injection/ejection from GdFeCo (Gd:Fe:Co=25:66:9). The abrupt change in loop polarity of the out-of-plane ﬁeld dependence of RT in YH2between 290 and 300 K, which aligns with the out-of-ﬁeld curve of the polar Kerr rotation in GdFeCo electrodes, strongly suggests that the observed RT results from the inverse spin Hall eﬀect (ISHE) in YH2. We analytically formulated ISHE in terms of the electron and hole spin currents injected from the spin sources, enabling regression analysis to assess the spin transport characteristics of a GdFeCo/YH2/GdFeCo magnetic double heterostructure. To explain the observed Hall voltages, enhancements in both the spin diﬀusion length of YH2and the spin injection eﬃciency are necessary.&#xD.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142639263","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

Charge-driven first-order magnetic transition in NiPS₃. NiPS3 中电荷驱动的一阶磁性转变。

IF 4.6 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-15 DOI: 10.1088/1361-648X/ad8ea0

Junik Hwang, Seonghoon Park, Beom Hyun Kim, Junghyun Kim, Je-Geun Park, Seung-Ho Baek

引用次数: 0

Coverage- and temperature-induced self-metalation of tetraphenyltransdibenzoporphyrin on Cu(111). 铜（111）上四苯基反式二苯并卟啉的覆盖和温度诱导的自金属化。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-14 DOI: 10.1088/1361-648X/ad92d2

Majid Shaker, Maximilian Muth, Julien Steffen, Alisson Ceccatto Dos Santos, Simon Jaekel, Rajan Adhikari, Lampros-Pascal Gazetas, Christoph Oleszak, A de Siervo, Norbert Jux, Andreas Gorling, Ole Lytken, Hans-Peter Steinrück

{"title":"Coverage- and temperature-induced self-metalation of tetraphenyltransdibenzoporphyrin on Cu(111).","authors":"Majid Shaker, Maximilian Muth, Julien Steffen, Alisson Ceccatto Dos Santos, Simon Jaekel, Rajan Adhikari, Lampros-Pascal Gazetas, Christoph Oleszak, A de Siervo, Norbert Jux, Andreas Gorling, Ole Lytken, Hans-Peter Steinrück","doi":"10.1088/1361-648X/ad92d2","DOIUrl":"https://doi.org/10.1088/1361-648X/ad92d2","url":null,"abstract":"We have investigated the adsorption and self-metalation of free-base tetraphenyltransdibenzoporphyrin (2H-TPtdBP) on Cu(111) as a function of coverage and temperature using scanning tunneling microscopy, X-ray photoelectron spectroscopy, temperature programmed desorption, and density-functional theory calculations. At low coverages (<0.16 molecules/nm2), we observe isolated individual molecules with an inverted conformation and no self-metalation up to 363 K. At higher coverages, both the formation of ordered islands and self-metalation are observed over time already at room temperature, and accelerate upon heating to 363 K. At 423 K, complete self-metalation occurs for all coverages up to the completed first layer. By comparing our results for 2H-TPtdBP to the existing literature on other tetraphenyl-based porphyrins, we demonstrate how adsorption and self-metalation can be tailored by the choice of substituents.&#xD.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622286","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

Finite-frequency noise, Fano factor, ΔT-noise and cross-correlations in double quantum dots. 双量子点中的有限频率噪声、法诺因子、ΔT 噪声和交叉相关性。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-14 DOI: 10.1088/1361-648X/ad92d4

Crépieux Adeline, Quynh Duong, Mireille Lavagna

{"title":"Finite-frequency noise, Fano factor, ΔT-noise and cross-correlations in double quantum dots.","authors":"Crépieux Adeline, Quynh Duong, Mireille Lavagna","doi":"10.1088/1361-648X/ad92d4","DOIUrl":"https://doi.org/10.1088/1361-648X/ad92d4","url":null,"abstract":"A theoretical study on electrical current fluctuations in a double quantum dot connected to electronic reservoirs is presented, with the aim of deriving the finite-frequency noise, the Fano factor and the ΔT-noise. We establish a general expression for the noise in terms of Green functions in the double quantum dot and self-energies in the reservoirs. This result is then applied to model double quantum dots in various situations. For a non-interacting double quantum dot, we have highlighted several interesting features in the physical properties of this system. In particular, we have demonstrated the possibility of obtaining a significant reduction in zero-frequency noise and Fano factor either when the system is placed in a given operating regime, or when a temperature gradient is applied between the two reservoirs, resulting in a negative ΔT-noise being generated. In addition, in the vicinity of honeycomb vertices, a sign change is observed in the finite-frequency cross-correlator between the two reservoirs, in contrast to what is obtained for the zero-frequency cross-correlator, which remains negative throughout the (ε1,ε2)-plane, ε1, ε2 being the level energies in each of the two dots. By using an approximate first-level numerical approach, we finally study how the finite-frequency noise in a double quantum dot evolves under the influence of Coulomb interactions.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622370","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

Drastic enhancement of electronic correlations induced by hydrogen insertion in the cerium intermetallic compound CeFeSi. 铈金属间化合物 CeFeSi 中氢插入引起的电子相关性急剧增强。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-14 DOI: 10.1088/1361-648X/ad92d3

Jeremy Sourd, Baptiste Vignolle, Etienne Gaudin, Sebastien Burdin, Sophie Tencé

引用次数: 0

Thickness-dependent structural and growth evolution in relation to dielectric relaxation behavior and correlated barrier hopping conduction mechanism in Ni0.5Co0.5Fe2O4 ferrite thin films. 厚度依赖性结构和生长演变与 Ni0.5Co0.5Fe2O4 铁氧体薄膜的介电弛豫行为和相关势垒跳变传导机制的关系。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-14 DOI: 10.1088/1361-648X/ad92d5

Somnath Sahu, Shashi Priya Balmuchu, Pamu Dobbidi

{"title":"Thickness-dependent structural and growth evolution in relation to dielectric relaxation behavior and correlated barrier hopping conduction mechanism in Ni0.5Co0.5Fe2O4 ferrite thin films.","authors":"Somnath Sahu, Shashi Priya Balmuchu, Pamu Dobbidi","doi":"10.1088/1361-648X/ad92d5","DOIUrl":"https://doi.org/10.1088/1361-648X/ad92d5","url":null,"abstract":"Ferrite thin films are explored due to their promising properties, which are essential in various advanced electronic devices. However, depositing a film with pure phase and uniform microstructure is challenging. The Ni0.5Co0.5Fe2O4 ferrite thin films are deposited using pulsed laser deposition (PLD) technique to explore the effect of thickness on structural properties, growth evolution, temperature-dependent dielectric behavior, and conduction mechanisms. Microstructural analysis revealed that the films are uniformly grown, exhibiting surface roughness ranging from  2 to 4 nm. The dielectric response, adhering to a modified Debye model, exhibited multiple relaxation processes, with notable changes in the dielectric constant and loss as film thickness increased. Impedance spectra exhibited both space charge and dipolar relaxation phenomena, corroborated by Cole-Cole and electrical modulus plots. The analysis of the imaginary electric modulus using the Kohlrausch-Williams-Watts (KWW) function revealed non-Debye-type relaxation in all deposited films, characterized by thermally activated broad peaks. Conductivity decreased up to a certain film thickness, and the frequency exponent derived from Jonscher's power law suggested a correlated barrier hopping model for AC conduction. Activation energies improved with film thickness up to 125 nm, consistent with a constant energy barrier for polarons during relaxation and conduction phases. The film with 125 nm thickness exhibited the optimal dielectric properties, with the maximum dielectric constant, minimum dielectric loss, and highest activation energy. These findings highlight the potential of dense, uniformly grown films with high dielectric constants and low dielectric losses for advanced electronic device applications.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622576","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

Electronic Properties of Polyaniline-Graphene Nanocomposites Synthesized via Solution Mixing Method. 通过溶液混合法合成的聚苯胺-石墨烯纳米复合材料的电子特性

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-14 DOI: 10.1088/1361-648X/ad92ec

Soumyasuravi Thakur, Neeraj Rathee, Nirat Ray

引用次数: 0