Physica B-condensed Matter最新文献_第3页

Polarization effect on the Auger recombination coefficient in single InGaN/GaN quantum wells InGaN/GaN量子阱中极化效应对俄歇复合系数的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-18 DOI: 10.1016/j.physb.2025.417278

V.S. Slipokurov , A.V. Zinovchuk

引用次数: 0

Investigations on electronic structure and transport property modifications of La0.7Ca0.3-xKxMnO3 ceramics La0.7Ca0.3-xKxMnO3陶瓷的电子结构及输运性能改性研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-18 DOI: 10.1016/j.physb.2025.417279

Pratik Lakhani , Paresh Sidhdhapura , Mayur Vala , Tanvi Dudhrejiya , Nirali Udani , Sandhya Dodia , Gaurav Jadav , Pankaj Solanki , Dhananjay Dhruv , Sergei A. Sharko , J.H. Markna , Bharat Kataria

{"title":"Investigations on electronic structure and transport property modifications of La0.7Ca0.3-xKxMnO3 ceramics","authors":"Pratik Lakhani , Paresh Sidhdhapura , Mayur Vala , Tanvi Dudhrejiya , Nirali Udani , Sandhya Dodia , Gaurav Jadav , Pankaj Solanki , Dhananjay Dhruv , Sergei A. Sharko , J.H. Markna , Bharat Kataria","doi":"10.1016/j.physb.2025.417279","DOIUrl":"10.1016/j.physb.2025.417279","url":null,"abstract":"<div><div>The partial substitution of monovalent alkali metal K+ at the divalent Ca2+ site in La0.7Ca0.3MnO3 manganites (LCKMO) leads to remarkable structural, electronic, and magnetic modifications. This report combines structural, transport, magneto transport, and X-ray photoelectron spectroscopy (XPS) studies to examine these modifications in LCKMO samples with varying alkali metal content. X-ray diffraction (XRD) confirmed the orthorhombic crystal structure and single-phasic nature, while transport and magnetoresistance studies highlighted the effects of K+ substitution on the metal-insulator transition temperature (TP) and resistivity. X-ray Photoelectron Spectra (XPS) analysis decodes the Mn3+/Mn4+ mixed-valence states, providing insights into the Jahn-Teller (JT) distortions and double-exchange (DE) mechanisms manipulating the observed magnetic behaviour. These findings highlight the carping interplay of structural and electronic modifications in tailoring the functional properties of manganites for potential technological applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417279"},"PeriodicalIF":2.8,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Observation of exchange bias properties in Lu substituted BiFeO3 观察 Lu 取代 BiFeO3 的交换偏置特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-18 DOI: 10.1016/j.physb.2025.417263

K. Krishna Rao, T. Durga Rao, K. Naga Raju, B. Sattibabu

{"title":"Observation of exchange bias properties in Lu substituted BiFeO3","authors":"K. Krishna Rao, T. Durga Rao, K. Naga Raju, B. Sattibabu","doi":"10.1016/j.physb.2025.417263","DOIUrl":"10.1016/j.physb.2025.417263","url":null,"abstract":"<div><div>Bi1-xLuxFeO3, x = 0.00, 0.03, 0.05 and 0.07 compounds were synthesized using the solid-state reaction method. Room temperature structural analysis was carried out for the prepared compounds through Rietveld refinement. The studies showed that the compounds were stabilized in a rhombohedral R3c structure at room temperature. UV–visible spectroscopy measurements revealed a slight widening in the optical band gap, from 2.03 eV to 2.08 eV, with the increase in x. The magnetic measurements indicated that remanent magnetization and coercive fields increased with the increase in the Lu substitution. Interestingly, the substituted compounds exhibited exchange bias properties under zero field cooled conditions. Polarization measurements indicated better ferroelectric polarization hysteresis loops observed in the compounds with higher Lu substitution. Impedance measurements demonstrated an improved insulating behaviour with Lu substitution. The grain and grain boundary resistances were extracted using a two-parallel RC circuit model. Additionally, the materials exhibited a negative temperature coefficient of resistance, as was evidenced by the ac conductivity measurements in all the prepared compounds.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417263"},"PeriodicalIF":2.8,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Computational insights into structural, elastic, optoelectronic, and thermodynamic properties of silver-based germanium ternary halide perovskites 银基锗三元卤化物钙钛矿的结构、弹性、光电和热力学性质的计算见解

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-17 DOI: 10.1016/j.physb.2025.417265

Izzat Khan , Amir Ullah , Nasir Rahman , Mudasser Husain , Hind Albalawi , Amani H. Alfaifi , Khamael M. Abualnaja , Wafa Mohammed Almalki , Vineet Tirth , Ahmed Azzouz-Rached , Mohammad Sohail

{"title":"Computational insights into structural, elastic, optoelectronic, and thermodynamic properties of silver-based germanium ternary halide perovskites","authors":"Izzat Khan , Amir Ullah , Nasir Rahman , Mudasser Husain , Hind Albalawi , Amani H. Alfaifi , Khamael M. Abualnaja , Wafa Mohammed Almalki , Vineet Tirth , Ahmed Azzouz-Rached , Mohammad Sohail","doi":"10.1016/j.physb.2025.417265","DOIUrl":"10.1016/j.physb.2025.417265","url":null,"abstract":"<div><div>This study explores the characteristics of AgGeX3 (X = Cl and F) using density functional theory (DFT), examining their structural, electronical, optical, elastic, thermal properties, and phonon modes. Both compounds have a perovskite-like crystal structure, with AgGeCl3 having a wider lattice constant (5.17 Å) than AgGeF3 (4.36 Å). AgGeCl3 has an indirect band gap of 0.553 eV, suitable for wide-range light absorption in optoelectronics, whereas AgGeF3 possesses a larger band gap. AgGeF3 exhibits a higher bulk modulus 53.26 GPa than AgGeCl3 28.91 GPa, implying greater resistance to deformation. Optical properties shows that AgGeCl3 have high absorption coefficient, optical conductivity, refractivity, and reflectivity which make it suitable to absorb light in visible range while AgGeF3 in UV range. By analyzing their thermal properties, AgGeF3 shows higher heat absorption (157.7 J/mol·K) and resistance to temperature changes (480 K at 20 GPa), while expanding less (6 × 10−5 K−1 at 0 GPa) and shrinking less under pressure. This makes it more stable under heat. In contrast, AgGeCl3 expands more (24 × 10−5 K−1 at 0 GPa) and resists temperature changes less (450 K at 20 GPa). These differences suggest AgGeF3 is better for applications with high pressure and sensitive temperature requirements, while AgGeCl3 is better for tasks like converting heat to electricity, creating electricity from light, and making electronics that can bend.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417265"},"PeriodicalIF":2.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Synthesis of nanocurcumin conjugated titanium dioxide bio-nanocomposites for enhanced optical, electrical, and antibacterial applications 合成纳米姜黄素共轭二氧化钛生物纳米复合材料，用于增强光学、电学和抗菌应用

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-17 DOI: 10.1016/j.physb.2025.417269

P. Anju , Hiba Muhammed , K. Arun , B.K. Bahuleyan , M.T. Ramesan

{"title":"Synthesis of nanocurcumin conjugated titanium dioxide bio-nanocomposites for enhanced optical, electrical, and antibacterial applications","authors":"P. Anju , Hiba Muhammed , K. Arun , B.K. Bahuleyan , M.T. Ramesan","doi":"10.1016/j.physb.2025.417269","DOIUrl":"10.1016/j.physb.2025.417269","url":null,"abstract":"<div><div>This study explores the synthesis of nanocurcumin (NCur) and its impact on the structural, electrical, and antibacterial properties of titanium dioxide (TiO2) through a simple solvent-free mechanical mixing. FTIR confirmed NC-TiO2 interactions, while UV–Vis spectroscopy showed a red shift and a reduced bandgap from 3.571 eV to 2.550 eV. XRD verified the crystalline retention of TiO2. Morphological analysis using optical microscopy and FE-SEM showed uniform NCur dispersion in TiO2 up to 6 wt%, beyond which agglomeration occurred. Electrical impedance studies demonstrated a 1.127-fold increase in conductivity at 100 Hz and a reduction in activation energy from 5.37 × 10−5eV to 5.00 × 10−5 at 6 wt% NCur. Additionally, the dielectric constant increased by 29 %, enhancing the material's energy storage potential. Antibacterial assays indicated that TiO2/NCur bio-nanocomposites exhibited significant antibacterial activity against E. coli, increasing efficacy by 183.33 %. These multifunctional properties make TiO2/NCur composites highly promising for applications in biosafe electronics, energy storage, and antibacterial technologies.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417269"},"PeriodicalIF":2.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Luminescence and radiative features of Gd2O3 modified and Pr3+ doped borate glass via energy transfer from Gd to Pr for blue- and UV-excited WLEDs Gd2O3修饰和Pr3+掺杂硼酸盐玻璃通过Gd到Pr的能量转移对蓝色和紫外光激发wled的发光和辐射特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-17 DOI: 10.1016/j.physb.2025.417270

I. Ullah , C.S. Sarumaha , A. Angnanon , I. Khan , M. Shoaib , S.A. Khattak , S. Kothan , G. Rooh , J. Kaewkhao

{"title":"Luminescence and radiative features of Gd2O3 modified and Pr3+ doped borate glass via energy transfer from Gd to Pr for blue- and UV-excited WLEDs","authors":"I. Ullah , C.S. Sarumaha , A. Angnanon , I. Khan , M. Shoaib , S.A. Khattak , S. Kothan , G. Rooh , J. Kaewkhao","doi":"10.1016/j.physb.2025.417270","DOIUrl":"10.1016/j.physb.2025.417270","url":null,"abstract":"<div><div>We investigate the XRD, FTIR, structure variation factors, optical absorption, luminescence and radiative behaviors of mixed Gd2O3 in a 20Li2O3-30SrO-(49-x)B2O3-xGd2O3-1Pr2O3 glass. The Judde-Ofelt (J-O) analysis of the absorption spectra is performed to deduce intensity parameters. The refractive index and Ωλ = 2, 4, 6 values are employed to evaluate the branching ratios (βR), and radiative transition probabilities (AR) of Pr3+ luminescent states. At a wavelength of 444 nm for optical pumping, critical factors such as significant optical gain, and gain bandwidth in the 3Po → 3H4 transition for designing visible laser systems are estimated. The Gd3+ ions sensitize the Pr3+ ions through ET from their 6P7/2 state to the 3PJ = 2, 1, 0 states of Pr3+ ions. The extracted Commission Internationale de l'Éclairage (CIE), correlated color temperature (CCT) and color purity (CP) values from the luminescence spectra demonstrate the emission of white light. These results have implications for WLEDs and optical amplification.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417270"},"PeriodicalIF":2.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Unstable states of non-volatile reconfigurable photonic device based on phase change material 基于相变材料的非易失性可重构光子器件的不稳定状态

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-15 DOI: 10.1016/j.physb.2025.417274

Jie Liao , Lidan Lu , Guang Chen , Yingjie Xu , Li Yang , Lianqing Zhu

引用次数: 0

XPS visualization of soft and hard Lewis base passivation of defects in MAPbI3 perovskite MAPbI3 包晶中缺陷的软路易斯基和硬路易斯基钝化的 XPS 视觉效果

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-15 DOI: 10.1016/j.physb.2025.417268

Ivan S. Zhidkov , Maxim F. Gerasimov , Victoria V. Ozerova , Lyubov A. Frolova , Marina I. Ustinova , Azat F. Akbulatov , Andrey I. Kukharenko , Pavel A. Troshin , Ernst Z. Kurmaev

{"title":"XPS visualization of soft and hard Lewis base passivation of defects in MAPbI3 perovskite","authors":"Ivan S. Zhidkov , Maxim F. Gerasimov , Victoria V. Ozerova , Lyubov A. Frolova , Marina I. Ustinova , Azat F. Akbulatov , Andrey I. Kukharenko , Pavel A. Troshin , Ernst Z. Kurmaev","doi":"10.1016/j.physb.2025.417268","DOIUrl":"10.1016/j.physb.2025.417268","url":null,"abstract":"<div><div>A new method for visualization of uncoordinated lead (Pb2+) in solution processed polycrystalline halide perovskite films is presented. The method is based on the measurements of XPS spectra with high energy resolution, which show a narrowing of the low-energy part of the Pb 4f-core level spectra due to passivation of halide vacancies with soft and hard Lewis base doping and reduction of contribution of uncoordinated lead (Pb2+) at binding energy of ∼137.8 eV. Based on XPS Pb 4f-spectra measurements the influence of size of hard Lewis base metal iodides on the passivation of surface defects in MAPbI3 perovskite is discussed. It is found that at low concentrations (1–5 %) CaI2, BaI2, AgI with metal ionic radius ≥1.0 Å the metal atoms substitute the coordinated Pb2+ atoms whereas at higher concentrations they are located at grain boundaries and passivate the uncoordinated lead sites. For hard Lewis base metal iodides with small ionic radii (0.7–0.8 Å) (MnI2, FeI2, CuI) the situation is quite different and metals occupy the interstitial positions keeping the uncoordinated Pb2+ ions to be unchanged. The use of appropriate charge-transport layers and soft Lewis base molecular modifiers can improve the crystallization of perovskite films by reducing the number of defects formed, which is also reflected in the XPS Pb 4f7/2 spectra.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"711 ","pages":"Article 417268"},"PeriodicalIF":2.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Frequency-dependent interface states and diode parameters of Au/n-Si Schottky diode with BOD-Z-EN interfacial layer in dark and under illumination 具有BOD-Z-EN界面层的Au/n-Si肖特基二极管在黑暗和光照下的频率依赖界面态和二极管参数

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-15 DOI: 10.1016/j.physb.2025.417273

Ali Osman Tezcan , Asrın Baran Çavdar , Serkan Eymur , Nihat Tuğluoğlu

{"title":"Frequency-dependent interface states and diode parameters of Au/n-Si Schottky diode with BOD-Z-EN interfacial layer in dark and under illumination","authors":"Ali Osman Tezcan , Asrın Baran Çavdar , Serkan Eymur , Nihat Tuğluoğlu","doi":"10.1016/j.physb.2025.417273","DOIUrl":"10.1016/j.physb.2025.417273","url":null,"abstract":"<div><div>The Au/BOD-Z-EN/n-Si Schottky barrier diode was studied using capacitance/conductance-voltage (C/G-V) and capacitance/conductance-frequency (C/G-f) characteristics under different illumination intensities and in the dark. The increment in C and G at the low-frequency regions, at which the surface states at the semiconductor-organic interface can easily follow the applied ac signal, could be attributed to the surface states. Under illumination, the appearance of peaks in conductance versus logarithm of frequency (<math><mrow><msub><mi>G</mi><mi>p</mi></msub><mo>/</mo><mi>ω</mi></mrow></math>- log <math><mrow><mi>f</mi></mrow></math>) graphs confirmed such interface trap states. It was found that the interface trap density (<math><mrow><msub><mi>D</mi><mrow><mi>i</mi><mi>t</mi></mrow></msub></mrow></math>) decreases from 5.81 × 1012 eV−1cm−2 to 2.87 × 1012 eV−1cm−2 while relaxation time (τ) decreases from 15.76 μs to 3.94 μs with increasing light intensity. The results showed that the barrier height (<math><mrow><msub><mi>Φ</mi><mi>B</mi></msub></mrow></math>) dropped, going from 0.667 eV (in the dark) to 0.582 eV (100 mW/cm2). The donor concentration (<math><mrow><msub><mi>N</mi><mi>D</mi></msub></mrow></math>) rose as the illumination intensity increased, going from 5.46 × 1015 cm−3 (in the dark) to 8.08 × 1015 cm−3 (100 mW/cm2).</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"710 ","pages":"Article 417273"},"PeriodicalIF":2.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Exploration of the impact of indium-doping on the microstructural, dispersion, linear, and nonlinear optical properties of the ZnS thin films 探讨铟掺杂对ZnS薄膜微结构、色散、线性和非线性光学性质的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-15 DOI: 10.1016/j.physb.2025.417271

Abdullah Alsulami

{"title":"Exploration of the impact of indium-doping on the microstructural, dispersion, linear, and nonlinear optical properties of the ZnS thin films","authors":"Abdullah Alsulami","doi":"10.1016/j.physb.2025.417271","DOIUrl":"10.1016/j.physb.2025.417271","url":null,"abstract":"<div><div>Good quality pure and indium-doped ZnS layers (containing 4, 9, and 12 wt% In) were produced using an economical nebulizer spray pyrolysis technique. The XRD observations indicate a cubic structure for the examined indium-doped ZnS layers. The crystallite size decreased from 54.58 to 23.68 nm with the augmentation of indium content from 4 to 12 wt%. The optical band gap of the studied layers decreased from 3.53 to 2.94 eV as the indium was introduced into ZnS, although the Urbach energy values enhanced from 0.78 to 0.86 eV with the rise in indium doping from 4 to 12 wt%. Furthermore, the refractive index of the examined layers increased from 2.63 to 3.81 with the augmentation of indium content from 4 to 12 wt%. Investigating nonlinear optical properties involves augmenting the nonlinear refractive index of indium-doped ZnS layers by increasing the indium concentration from 4 to 12 wt%. The study of the optoelectrical parameters reveals enhancements in optical conductivity, optical carrier concentration, electrical conductivity, optical dielectric constants, and relaxation time through an increased indium ratio. The indium-doped ZnS exhibited n-type conductivity.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"710 ","pages":"Article 417271"},"PeriodicalIF":2.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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