Physica B-condensed Matter最新文献

{"title":"Impact of Bi2O3 on the optical, structural, thermal, and nuclear radiation shielding properties of lead zinc borate glass","authors":"Usman Iliyasu ,&nbsp;Mohamad Syazwan Mohd Sanusi ,&nbsp;Nor Ezzaty Ahmad ,&nbsp;M.S. Al-Buriahi ,&nbsp;Hammam Abdurabu Thabit ,&nbsp;Abubakar A. Sifawa","doi":"10.1016/j.physb.2025.417076","DOIUrl":"10.1016/j.physb.2025.417076","url":null,"abstract":"<div><div>The influence of Bi₂O₃ substitution for B₂O₃ on the structural, optical, thermal, and radiation shielding characteristics of (75-<em>x</em>)B₂O₃-20ZnO-5Pb₃O₄-<em>x</em>Bi₂O₃ glass, where <em>x</em> = 5, 10, 15, 20 mol%, was synthesized via melt-quenching. Various material characterization techniques revealed amorphous properties, increased optical density with disordered structure, lowering glass thermal resistance as Bi₂O₃ concentrations increased in the glass structure. The linear and mass attenuation coefficient obtained experimentally, Geant4, and Phy-X/PSD showed a good agreement, increasing from 3.97 to 7.137 cm⁻¹ and from 0.953 to 1.357 cm²/g at 0.15 MeV, when 5 and 20 mol% Bi₂O₃ was added. At glass thickness of 0.5 cm, the Radiation Protection Efficiency (RPE) of the samples containing 5 and 20 mol% Bi₂O₃ was 86.21 % and 97.15 %, at an energy of 0.15 MeV and increased to 99.99 % and 100 % for 2 cm. These results suggest the synthesized glasses are promising candidates for radiation shielding applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417076"},"PeriodicalIF":2.8,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519570","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}

{"title":"A comprehensive first-principles investigation of the structure, electronic, magnetic and optical properties of orthorhombic CrO2 at 14 GPa","authors":"Sarajit Biswas","doi":"10.1016/j.physb.2025.417082","DOIUrl":"10.1016/j.physb.2025.417082","url":null,"abstract":"<div><div>The structure, electronic, magnetic and optical properties of orthorhombic CrO₂ (o-CrO₂) at 14 GPa are extensively investigated from the first-principles calculations. It is revealed that the Cr-O distances and &lt;O-Cr-O angles in o-CrO₂ decrease compared to rutile CrO₂ (r-CrO₂), resulting in structural distortion in the CrO₆ octahedra. The system is half-metallic in both GGA and GGA + U (U is the Coulomb interaction) calculations with metallic/insulating up/down spin channel. The partial filling and delocalization of electrons in the Cr-3d_x²_{- y}² and O-2p_x/y state near the Fermi level results in the metallic behaviour of o-CrO₂ for the up spin channel. The ground state energy calculations confirm that ferromagnetism is stabilized in o-CrO₂, with the strength of ferromagnetism enhanced upon the application of U = 3 eV. The cooperative effect of p-d hybridization and Cr-O antiferromagnetic coupling results in the ferromagnetism in o-CrO₂. The Curie temperature (T_c) of o-CrO₂ reduces by 166 K compared to r-CrO₂ and T_c reaches towards the room temperature for U = 3 eV. Several peaks are observed both for the real [<span><math><mrow><msub><mi>ε</mi><mn>1</mn></msub><mrow><mo>(</mo><mi>ω</mi><mo>)</mo></mrow></mrow></math></span>] and imaginary [<span><math><mrow><msub><mi>ε</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>ω</mi><mo>)</mo></mrow></mrow></math></span>] parts of the dielectric function, resulting in anisotropy in the structure. The anisotropy in the structure reduces upon the application of U = 3 eV. The net electron loss function <span><math><mrow><mi>L</mi><mrow><mo>(</mo><mi>ω</mi><mo>)</mo></mrow></mrow></math></span> is augmented upon the application of U, resulting in the reduction of conductivity of o-CrO₂. More interestingly, the plasmon frequencies corresponding to the x, y and z components of L(<span><math><mrow><mi>ω</mi></mrow></math></span>) decrease upon the application of U.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417082"},"PeriodicalIF":2.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508635","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}

{"title":"Thickness modulated optical and bandgap properties at visible frequencies of GeSe thin films","authors":"Yujun Shi ,&nbsp;Min Yuan ,&nbsp;Mingyang Wei ,&nbsp;Yueming Wang ,&nbsp;Mingyang Qin ,&nbsp;Zhongxu Wei ,&nbsp;Yue Chen ,&nbsp;Jie Lian","doi":"10.1016/j.physb.2025.417085","DOIUrl":"10.1016/j.physb.2025.417085","url":null,"abstract":"<div><div>GeSe holds significant potential for solar cell and spectral absorber applications due to its excellent absorption characteristics. However, the influence of thin film thickness on GeSe optical properties remains underexplored. In this study, we achieve the modulation of GeSe thin films’ optical and bandgap properties by varying their thicknesses. Non-destructive and highly accurate spectroscopic ellipsometry is employed to determine the complex optical constants, reflectivity, and bandgaps of GeSe thin films with different thicknesses. The multicolor phenomenon of GeSe adjusted by its thickness, is interpreted by the complementary color that the wavelength absorbed by the material. A negative correlation between the bandgaps and thin film thicknesses is extracted by calculating the Tauc-plot (<em>α</em>h<em>ν</em>)^1/2. This phenomenon is verified by the first-principles calculations by applying the compressive strain along the zigzag direction. Our findings provide a solid foundation for further research and practical applications for GeSe depending on thickness.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417085"},"PeriodicalIF":2.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519462","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}

{"title":"A broadband absorber based on W−TiO2 ellipsoidal core-shell array structure","authors":"Hao Fu,&nbsp;Fang Chen,&nbsp;Wenxing Yang","doi":"10.1016/j.physb.2025.417077","DOIUrl":"10.1016/j.physb.2025.417077","url":null,"abstract":"<div><div>In this paper, we demonstrate a new broadband perfect absorber based on an ellipsoidal core-shell array structure. The perfect absorber is formed by a core-shell nano-ellipsoid array of tungsten and titanium dioxide (<span><math><mrow><mi>W</mi><mo>/</mo><mtext>Ti</mtext><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span>). Under the TM polarization, the average absorption of the designed structure reached 97.93 % from 400 nm to 1700 nm. Besides, the average absorption rate for solar radiation can reach up to 96.64 % under AM 1.5. Physical mechanisms responsible for the high -efficiency broadband absorption are elucidated of localized surface plasmon polaritons (LSPPs) on the surface of the metallic ellipsoid, and the gap plasmon resonance(GPR) resonance at the gap between adjacent shells. Besides, the effects of geometrical sizes, like the <span><math><mrow><mtext>Ti</mtext><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span> shell thickness, <span><math><mrow><mi>W</mi></mrow></math></span> core radius, polarization angle, and incidence angle on the absorption line are further explored. The asymmetric elliptical spherical structure design results in more LSPPs resonance modes being excited (Such as longitudinal mode and transverse mode). The coupling of these modes enhances broadband absorption and provides more error space for the fabrication of spherical nanoparticle array structures. Furthermore, the structure shows a high thermal emissivity of 99.13 % can be achieved when the temperature reaches 1700 K. Given that <span><math><mrow><mtext>Ti</mtext><msub><mi>O</mi><mn>2</mn></msub><mo>/</mo><mi>W</mi></mrow></math></span> have melting points above 1700 K, and the proposed structure with <span><math><mrow><mtext>Ti</mtext><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span> as shell provides low synthesis cost benefit and is used for various applications like solar energy conversion, photothermal conversion, and thermal radiators.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417077"},"PeriodicalIF":2.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550478","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}

{"title":"Engineering of high surface defects in 2D-MoS2 nanostructures through CTAB surface functionalization for highly selective CO gas sensing","authors":"Priyanka Patel ,&nbsp;Anchal Pandey ,&nbsp;Venkataramana Bonu ,&nbsp;Kishore K. Madapu ,&nbsp;Om P. Khatri ,&nbsp;Harish C. Barshilia","doi":"10.1016/j.physb.2025.417087","DOIUrl":"10.1016/j.physb.2025.417087","url":null,"abstract":"<div><div>A highly selective chemoresistive CO gas sensor is developed based on the ammonium surfactant functionalized hierarchical microspheres of 2D-MoS₂ (C-MoS₂) nanosheets. The samples were synthesized via a facile one-step hydrothermal process. The C-MoS₂ was annealed at 400 °C to prepare the CA-MoS₂. As a result, high surface area, enhanced defects, and reduced high-energy binding sites were formed in the CA-MoS₂. Detailed analysis revealed the presence of tensile strain, breakage of the lamellae, and point defects in CA-MoS₂. These conditions facilitated a fast exothermic reaction between CO gas and CA-MoS₂ following the Langmuir-Hinshelwood mechanism. The developed gas sensors are exposed to CO, NO₂, NH₃, and H₂ gases in a temperature range of 150–300 °C. The optimized CA-MoS₂ showed high selectivity and sensitivity of 4.1 % towards 80 ppm of CO at 250 °C. Good cyclic reproducibility and stability over five weeks are also observed for the sensor.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417087"},"PeriodicalIF":2.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519467","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}

{"title":"Oleic acid-ligated Co0.7 doped Ca0.3Fe2O4 nanoparticles: A synergistic approach for enhanced wastewater purification and magnetic hyperthermia applications","authors":"P. Rosaiah ,&nbsp;Charan Kuchi ,&nbsp;Radhalayam Dhanalakshmi ,&nbsp;Kilari Naveen Kumar ,&nbsp;Masoom Raza Siddiqui ,&nbsp;Guru Prakash Nunna ,&nbsp;Tae Jo Ko","doi":"10.1016/j.physb.2025.417079","DOIUrl":"10.1016/j.physb.2025.417079","url":null,"abstract":"<div><div>Magnetic nanoparticles have garnered considerable interest due to their multifunctional capabilities in various applications. This study focuses on the synthesis of oleic acid-anchored Co_0.7Ca_0.3Fe₂O₄ spinel nanoferrites, which were synthesized by the thermal decomposition of metal acetylacetonates in octadecene using oleic acid and oleylamine as surfactants. These nanoparticles exhibit a well-crystallized structures, narrow size distribution, and biocompatibility. The photocatalytic properties of the nanoparticles were evaluated through the degradation of the anionic Orange II and the cationic methylene blue (MB) dyes under UV light. Significant degradation efficiencies were observed; Orange II showed 92.4 % degradation within 60 min, whereas MB achieved 89.8 % over 300 min. Additionally, the specific absorption rate (SAR) of the magnetic fluids was determined via adiabatic calorimetry under varying magnetic fields and concentrations, revealing a maximum SAR of 418 W/g at a concentration of 3 mg/mL and a magnetic field of 475 Oe.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417079"},"PeriodicalIF":2.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527026","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}

{"title":"Effect of spin fluctuations on magnetoresistance and anomalous Hall effect in the chiral magnet Co8Zn8Mn4","authors":"P. Saha,&nbsp;P. Das,&nbsp;M. Singh,&nbsp;R. Rai,&nbsp;S. Patnaik","doi":"10.1016/j.physb.2025.417035","DOIUrl":"10.1016/j.physb.2025.417035","url":null,"abstract":"<div><div>The <span><math><mi>β</mi></math></span> -Mn type cubic Co-Zn-Mn compounds have received significant attention recently due to their ability to host skyrmions at room temperature. The objective of this study is to thoroughly investigate the magnetotransport properties of one member of the family (Co₈Zn₈Mn₄) and delineate the role played by different scattering mechanism in the presence of magnons and spin fluctuations. A negative magnetoresistance is observed over a wide temperature range of 55 K to 300 K. The deviation of isothermal magnetoresistance curves from linearity to non-linearity, points towards the transition from the dominance of magnons to spin fluctuations. The relationship between the anomalous Hall effect and longitudinal resistivity is studied. It reveals the dominance of skew scattering mechanism. We experimentally determine that the spin fluctuations dictate the skew-scattering mechanism in Co₈Zn₈Mn₄. Our findings shed light on the microscopic origin of magnetotransport in skyrmionic compounds.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"704 ","pages":"Article 417035"},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479884","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}

{"title":"Magnetization and Aharonov–Bohm effect from the confinement of a point charge to an attractive r−2 potential in a uniform magnetic field","authors":"J. Carvalho Veloso,&nbsp;K. Bakke","doi":"10.1016/j.physb.2025.417033","DOIUrl":"10.1016/j.physb.2025.417033","url":null,"abstract":"<div><div>We study the Aharonov–Bohm effect for bound states from the confinement of a point charge to an attractive <span><math><msup><mrow><mi>r</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span> potential under the influence of an external uniform magnetic field. By analysing the asymptotic behaviour of the radial wave function, we show that a discrete spectrum of energy can be obtained, where the bound states are achieved around the inner radius of a long nonconducting cylinder. In addition, we calculate the magnetization at zero temperature. From another perspective, we discuss the Aharonov–Bohm effect for bound states when the centrifugal term is the dominant term. We also obtain bound states around the inner radius of a long nonconducting cylinder and a discrete spectrum of energy which differs from that of the first case. We go further by calculating the magnetization at zero temperature.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417033"},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509168","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}

{"title":"Enhancing the performance of As-Se-S thin films through thermal and electrical property optimization","authors":"Halemah I. El-Saeedy ,&nbsp;Ammar Qasem","doi":"10.1016/j.physb.2025.417054","DOIUrl":"10.1016/j.physb.2025.417054","url":null,"abstract":"<div><div>This study aims to perform thermal calculations for As₄₀S₄₅Se₁₅ (ASS) thin films, avoiding the need for bulk material measurements. Sheet resistance was evaluated across various thicknesses (350, 500, 700, 850, and 1000 nm) at a controlled heating rate of 5 K/min in the 350–500 K temperature range. The surface resistance curves reveal two distinct regions, with an inflection point marking the onset of crystallization, suggesting a single amorphous-to-crystalline transformation. Electron microscopy provides additional evidence of this transition, while EDX analysis confirms the film composition aligns with intended ratios. X-ray diffraction (XRD) analysis further characterizes the structural properties, highlighting an exothermic heat transfer process linked to crystallization kinetics. The study also examines electrical properties across extended and hopping states, shedding light on the impact of thickness variations on electrical behavior within the 350–500 K range.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417054"},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549590","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}

{"title":"Tuning the structural, optical, electrical and photocatalysis properties of CuFe1-xAlxS2 nanoparticles synthesized by hydrothermal method","authors":"Bhaskaraiah M ,&nbsp;Kaleemulla Shaik","doi":"10.1016/j.physb.2025.417059","DOIUrl":"10.1016/j.physb.2025.417059","url":null,"abstract":"<div><div>In this study, Aluminum (Al) substituted CuFe_1-xAl_xS₂ (<span><math><mrow><mn>0.1</mn><mo>&lt;</mo><mi>x</mi><mo>&lt;</mo><mn>0.4</mn></mrow></math></span>) nanoparticles were prepared using hydrothermal method and the effect of Al was investigated on structural, optical, chemical, and surface morphology of the prepared compunds. The synthesized nanoparticles were subjected to various characterizations such as XRD, FE-SEM, EDAX, BET, TGA and DTA, UV–Vis–NIR spectrophotometer, FT-IR, PL spectrophotometer, and XPS to study the structural, surface, chemical composition, optical, luminescence and elemental analysis, respectively. The X-ray diffraction analysis and Rietveld refinement were employed to confirm the polycrystalline tetragonal and cubic structure of the synthesized nano-particles. The morphological structure was spherical and microflake-like confirmed by SEM micrographs. The chemical analysis was carried out using EDAX spectra and elements were mapped. The specific surface area and pore diameter were determined by using BET surface analyzer. The thermal analysis was carried out using TGA and DTA and major weight loss was observed in temperature range 300–500 °C. In the visible range, the CuFe_1-<em>x</em>Al_<em>x</em>S₂ (<span><math><mrow><mn>0.1</mn><mo>&lt;</mo><mi>x</mi><mo>&lt;</mo><mn>0.4</mn></mrow></math></span>) nanoparticles exhibited direct band gap and it increased from 1.53eV to 1.73 eV with increase of Al concentration from <em>x</em> = 0 to <em>x</em> = 0.4. The composition and the functional groups were studied using FT-IR and three infrared active modes at 1045 cm⁻¹, 1640 cm⁻¹, and 3400 cm⁻¹ were observed in FT-IR spectra. The valence states of the elements were also confirmed from X-ray photoelectron spectroscopy. The CuFe_1-<em>x</em>Al_<em>x</em>S₂ nanoparticles exhibited two emission peaks at 253 nm and 532 nm in photoluminescence spectrum. Electrical Properties of CuFe_1-<em>x</em>Al_<em>x</em>S₂ (<span><math><mrow><mn>0.1</mn><mo>&lt;</mo><mi>x</mi><mo>&lt;</mo><mn>0.4</mn></mrow></math></span>) nanoparticles were studied by using the two probe method. From all these results it was confirmed that the dopant Al played an important role in tuning above all properties. The photoctalytic activity of CuFe_1-<em>x</em>Al_<em>x</em>S₂ nanoparticles was analyzed by the organic dye such as rhodamine B (RhB), methylene orange (MO) dyes. From all these properties the CuFe_1-<em>x</em>Al_<em>x</em>S₂ will be best suitable for photovoltaic and photocatalytic applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"705 ","pages":"Article 417059"},"PeriodicalIF":2.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526889","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}