Physica B-condensed Matter最新文献

Study of the isotopic effect and the influence of cooling rate on pining mechanism in organic superconductor κ-(BEDTTTF)2Cu[N(CN)2]Br 有机超导体κ-(BEDTTTF)2Cu[N(CN)2]Br的同位素效应及冷却速率对针尖机制的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-10-02 DOI: 10.1016/j.physb.2025.417883

Omar Sliman , Ahmed Tirbiyine , J. Elqars , A. Bourdyme , Mohammed Bellioua , N. El ghazal , Hassan Elouaddi , Youssef Ait Ahmed , Mohammed Id elamel

{"title":"Study of the isotopic effect and the influence of cooling rate on pining mechanism in organic superconductor κ-(BEDTTTF)2Cu[N(CN)2]Br","authors":"Omar Sliman , Ahmed Tirbiyine , J. Elqars , A. Bourdyme , Mohammed Bellioua , N. El ghazal , Hassan Elouaddi , Youssef Ait Ahmed , Mohammed Id elamel","doi":"10.1016/j.physb.2025.417883","DOIUrl":"10.1016/j.physb.2025.417883","url":null,"abstract":"<div><div>This study investigates the impact of the cooling rate on pinning efficiency and vortex dynamics of the deuterated and hydrogenated organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. It also examines the effect of magnetic field on the critical transition temperature and the isotopic effect. Slow cooling enhances pinning strength, while rapid cooling weakens pinning efficiency and shifts vortex regime transitions to lower magnetic fields, particularly in the deuterated compound. This suppression of vortex pinning by fast cooling is inconsistent with the simple pinning effect and can be explained by the ethylene-disorder-domain model. The dominant pinning mechanism is not significantly affected by the cooling rate in the hydrogenated compound, but is radically affected in deuterated one. The critical transition temperature decreases with the magnetic field, and the test of the isotopic effect confirms that the mechanism responsible for superconductivity is far from conventional in our compound, and reveals a weak isotope effect, suggesting that interlayer coupling plays a significant role in layered organic superconductors.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417883"},"PeriodicalIF":2.8,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223252","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

Strengthening mechanisms for multicomponent Cu(Al)/Fe(Cr,Ni) alloys produced via dual-wire electron beam additive manufacturing 双线电子束增材制造多组分Cu(Al)/Fe（Cr,Ni）合金的强化机理

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-10-02 DOI: 10.1016/j.physb.2025.417884

А. Panfilov, A. Zykova, D. Gurianov, N. Savchenko, E. Kolubaev, A. Vorontsov

引用次数: 0

Enhancing critical current density in ex-situ MgB2 via high-temperature sintering with SiC and MgH2 additives SiC和MgH2添加剂高温烧结提高非原位MgB2临界电流密度

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-10-01 DOI: 10.1016/j.physb.2025.417882

Nurhidayah Mohd Hapipi , Soo Kien Chen , Abdul Halim Shaari , Mohd Mustafa Awang Kechik , Kean Pah Lim , Aliah Nursyahirah Kamarudin , Muhammad Kashfi Shabdin , Kar Ban Tan , Oon Jew Lee , Muralidhar Miryala

{"title":"Enhancing critical current density in ex-situ MgB2 via high-temperature sintering with SiC and MgH2 additives","authors":"Nurhidayah Mohd Hapipi , Soo Kien Chen , Abdul Halim Shaari , Mohd Mustafa Awang Kechik , Kean Pah Lim , Aliah Nursyahirah Kamarudin , Muhammad Kashfi Shabdin , Kar Ban Tan , Oon Jew Lee , Muralidhar Miryala","doi":"10.1016/j.physb.2025.417882","DOIUrl":"10.1016/j.physb.2025.417882","url":null,"abstract":"<div><div>In this study, ex-situ magnesium diboride (MgB2) powders were co-added with 5 wt% silicon carbide (SiC) and varying amounts of magnesium hydride, MgH2 (x = 0, 3, 6 mol.%). All samples were sintered at 900 °C and 1000 °C. X-ray diffraction analysis revealed that sintering undoped samples at 1000 °C reduced MgB2 phase due to the formation of MgB4 and MgO secondary phases. However, the addition of 6 mol.% MgH2 in samples sintered at 1000 °C increased the MgB2 phase fraction to 43.0 %. Scanning Electron Microscopy showed enhanced grain connectivity and smaller grain size, which greatly improved the critical current density to 22517 A/cm2 at 20 K under self-field. The co-addition of MgH2 also improved the Tc-onset from 35.9 K (pure MgB2) to 38.4 K and narrowed transition width, ΔTc. This study shows that the co-addition of MgH2 and SiC to ex-situ MgB2, especially at high sintering temperatures, improved the superconducting properties of the samples.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417882"},"PeriodicalIF":2.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223253","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

Electronic and optical properties of biaxially strained Al1-xGaxN and In1-xGaxN 双轴应变Al1-xGaxN和In1-xGaxN的电子和光学性质

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-10-01 DOI: 10.1016/j.physb.2025.417877

Abdelhakim Meziani , Hakan Hikmet Gürel , Azzedine Telia

{"title":"Electronic and optical properties of biaxially strained Al1-xGaxN and In1-xGaxN","authors":"Abdelhakim Meziani , Hakan Hikmet Gürel , Azzedine Telia","doi":"10.1016/j.physb.2025.417877","DOIUrl":"10.1016/j.physb.2025.417877","url":null,"abstract":"<div><div>This study presents a comprehensive first-principles investigation of the structural, electronic, and optical properties of Al1-xGaxN and In1-xGaxN ternary alloys (x = 0, 0.25, 0.5, 0.75, 1) under biaxial strain conditions ranging from −6 % to +6 %. Density functional theory (DFT) with the PBE and TB-mBJ functionals was employed to obtain accurate predictions of band structures and dielectric responses. The results reveal that biaxial strain induces significant band-gap modulation—up to ∼1.5 eV in Al-rich alloys and ∼1.1 eV in In-rich alloys—providing tunability across a broad spectral range from the ultraviolet to the near-infrared. The imaginary part of the dielectric function, ε2 (ω), exhibits clear strain-induced shifts: tensile strain leads to a pronounced redshift and intensity enhancement, particularly in Ga- and In-rich alloys, while compressive strain induces a blueshift. The refractive indices nx and nz exhibit systematic composition- and strain-dependent trends, increasing monotonically with the incorporation of Ga or In and displaying notable anisotropy under strain. Specifically, tensile strain enhances both nx and nz by up to ∼0.3–0.4 across the alloy series, whereas compressive strain reduces them. Comparative analysis between Al1-xGaxN and In1-xGaxN highlights distinct strain sensitivities, reflecting differences in bond character and electronic polarizability. These findings demonstrate that a strategic combination of composition and strain engineering can effectively tailor the optoelectronic response of III-nitride alloys for applications in UV–visible light emitters, detectors, and high-efficiency photonic devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417877"},"PeriodicalIF":2.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223248","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

Dielectric and thermal properties of the ferroelectric NH4HSO4 close to phase transitions 铁电NH4HSO4的介电和热性质接近相变

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-30 DOI: 10.1016/j.physb.2025.417871

A. Kiraci , H. Yurtseven

{"title":"Dielectric and thermal properties of the ferroelectric NH4HSO4 close to phase transitions","authors":"A. Kiraci , H. Yurtseven","doi":"10.1016/j.physb.2025.417871","DOIUrl":"10.1016/j.physb.2025.417871","url":null,"abstract":"<div><div>This work gives the analysis of the dielectric and thermal properties close to the second order and first order types of ferroelectric-paraelectric phase transitions in ferroelectrics, in particular, NH4HSO4. The power-law formula is used by adapting the Kouvel-Fisher (KF) method describing the magnetization (<math><mrow><mi>M</mi></mrow></math>) and magnetic susceptibility (<math><mrow><msub><mi>χ</mi><mi>M</mi></msub></mrow></math>) in the case of the spontaneous polarization (<math><mrow><msub><mi>P</mi><mi>S</mi></msub></mrow></math>) and the dielectric constant (<math><mrow><mi>ϵ</mi></mrow></math>), respectively, in ferroelectric systems. Similar treatment is performed to describe the heat capacity (<math><mrow><msub><mi>C</mi><mi>P</mi></msub></mrow></math>) and the thermal expansivity (<math><mrow><msub><mo>∝</mo><mi>P</mi></msub></mrow></math>) close to the phase transitions in NH4HSO4.</div><div>We show that the variations of <math><mrow><msub><mi>P</mi><mi>S</mi></msub></mrow></math> and <math><mrow><mi>ϵ</mi></mrow></math> with the temperature near the upper Curie point (TC1 <math><mrow><mo>≅</mo></mrow></math> 270 K) exhibit linearity for the second order transition in NH4HSO4. A linear variation is also obtained between the <math><mrow><msub><mi>C</mi><mi>P</mi></msub></mrow></math> and <math><mrow><msub><mo>∝</mo><mi>P</mi></msub></mrow></math> with the temperature close to the lower Curie point (TC2 <math><mrow><mo>≅</mo></mrow></math> 160 K) for the first order transition in this crystal. Experimental data are used from the literature for our analysis. Our approach given here to describe dielectric and thermal properties of NH4HSO4 close to the Curie points, can be applied to some other ferroelectric materials.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417871"},"PeriodicalIF":2.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223249","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

Theoretical investigations of mechanical, magnetic and thermoelectric properties of Zr2VX(X= Al, Ga, In) full Heusler alloys Zr2VX（X= Al, Ga, In）全Heusler合金力学、磁性和热电性能的理论研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-30 DOI: 10.1016/j.physb.2025.417866

Hind Alqurashi , Obaidallah A. Algethami , Eesha Andharia , Bothina Hamad , Ahmed Zakaria , K. Ayuel

{"title":"Theoretical investigations of mechanical, magnetic and thermoelectric properties of Zr2VX(X= Al, Ga, In) full Heusler alloys","authors":"Hind Alqurashi , Obaidallah A. Algethami , Eesha Andharia , Bothina Hamad , Ahmed Zakaria , K. Ayuel","doi":"10.1016/j.physb.2025.417866","DOIUrl":"10.1016/j.physb.2025.417866","url":null,"abstract":"<div><div>Density-functional-theory calculations were carried out to elucidate the structural, magnetic, and thermoelectric properties of the full-Heusler compounds Zr2VX (X = Al, Ga, In). All three compounds adopt the cubic L21 structure (space group Fm <math><mrow><mover><mn>3</mn><mo>‾</mo></mover></mrow></math> m) and satisfy the Born–Huang criteria, with elastic moduli that place them in the ductile regime. Spin-polarized electronic-structure analysis predicts ferromagnetic ordering and Curie temperatures well above ambient, underscoring their promise for spintronic devices. Boltzmann-transport calculations (constant-relaxation-time approximation) further indicate competitive thermoelectric performance; in particular, Zr2VGa attains a room-temperature figure of merit ZT ≈ 2.4, markedly higher than values reported for most Heusler systems studied to date. The synergy of mechanical robustness, high-temperature ferromagnetism, and sizeable ZT highlights Zr2VX alloys as versatile candidates for multifunctional energy and spin-electronic applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417866"},"PeriodicalIF":2.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223251","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

Investigation of up-conversion luminescence properties and optical temperature sensing behavior in CaMoO4: Pr3+/ Yb3+ phosphors CaMoO4: Pr3+/ Yb3+荧光粉的上转换发光特性和光学感温行为研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-29 DOI: 10.1016/j.physb.2025.417869

Francisco Enilton Alves Nogueira , João Paulo Costa do Nascimento , Felipe Felix do Carmo , Tallison Oliveira Abreu , Marcelo Antonio Santos da Silva , Ronaldo Santos da Silva , Charanjeet Singh , Antonio Sergio Bezerra Sombra

{"title":"Investigation of up-conversion luminescence properties and optical temperature sensing behavior in CaMoO4: Pr3+/ Yb3+ phosphors","authors":"Francisco Enilton Alves Nogueira , João Paulo Costa do Nascimento , Felipe Felix do Carmo , Tallison Oliveira Abreu , Marcelo Antonio Santos da Silva , Ronaldo Santos da Silva , Charanjeet Singh , Antonio Sergio Bezerra Sombra","doi":"10.1016/j.physb.2025.417869","DOIUrl":"10.1016/j.physb.2025.417869","url":null,"abstract":"<div><div>CaMoO4:Pr3+/Yb3+ phosphors were synthesized employing the solid-state reaction, whereas the temperature dependence of up-conversion (UC) luminescence properties under 980 nm excitation and the potential application as an optical temperature sensor were investigated. X-ray diffraction (XRD) analysis demonstrated the absence of secondary phase, confirming the formation of a single phase for the materials investigated and that co-doped samples have the same structure as CaMoO4. Phosphors were excited at 980 nm demonstrating blue, green, red emissions correlated to transitions from Pr3+ ions. Moreover, optical temperature-sensing properties were analyzed employing the Fluorescence Intensity Ratio (FIR) technique, whereas relative (SR) and absolute (SA) sensitivities were calculated from Thermally Coupled Levels (TCL) and Non-Thermally Coupled Levels (NTCL) from Pr3+ ions. The highest sensitivity values were obtained for NTCL 600 nm/650 nm, with SA = 14.81 × 10−3 K−1 and SR = 1.93 % K−1 demonstrating that the CaMoO4:Pr3+/Yb3+ system could be employed as optical temperature sensors in the high-temperature region.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"718 ","pages":"Article 417869"},"PeriodicalIF":2.8,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189696","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

Flexible copper iodide photodetector with Schottky contacts and surface plasmon resonance effect induced by silver nanoparticles 具有肖特基接触和纳米银表面等离子体共振效应的柔性碘化铜光电探测器

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-29 DOI: 10.1016/j.physb.2025.417872

S.I. Petrushenko , K. Adach , M. Fijalkowski , D. Fedonenko , S.V. Dukarov , V.M. Sukhov , A.L. Khrypunova , N.P. Klochko

{"title":"Flexible copper iodide photodetector with Schottky contacts and surface plasmon resonance effect induced by silver nanoparticles","authors":"S.I. Petrushenko , K. Adach , M. Fijalkowski , D. Fedonenko , S.V. Dukarov , V.M. Sukhov , A.L. Khrypunova , N.P. Klochko","doi":"10.1016/j.physb.2025.417872","DOIUrl":"10.1016/j.physb.2025.417872","url":null,"abstract":"<div><div>In this work, a low-cost aqueous automatic Successive Ionic Layer Adsorption and Reaction (SILAR) method used to deposit a nanostructured sulfur-doped copper iodide (CuI) film with a single-phase γ-CuI nanoflake structure on a polyethylene terephthalate (PET) substrate. The idea of one-step vacuum evaporation of silver was implemented to simultaneously obtain two back-to-back connected Schottky contacts CuI/Ag and hemispherical silver nanoparticles (AgNPs) with a diameter of ∼40 nm, capable of creating the effect of localized surface plasmon resonance (LSPR) with the fabrication of a flexible CuI@Ag/PET UV–Vis photodetector. Its photoelectric parameters show a linear dynamic range value of more than 19 dB, responsivity of 27 mA/W, specific detectivity of 5.3‧1010 Jones and external quantum efficiency of 9.1 %. Under UV, blue, green and red light illumination and bias voltage from 20 mV to 2 V, the CuI@Ag/PET UV–Vis photodetector exhibits excellent flexibility and high stability of characteristics even after 500 bending cycles.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"717 ","pages":"Article 417872"},"PeriodicalIF":2.8,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221045","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

Internal friction of interstitials in group 5 transition metals: A mean-field model for measurements interpretation 第5族过渡金属间隙的内摩擦：测量解释的平均场模型

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-29 DOI: 10.1016/j.physb.2025.417857

Paul Eyméoud , Philippe Maugis

引用次数: 0

Correlation between structure and physical properties in Cu/Al-substituted barium hexaferrites ((Ba1–xCux)(AlxFe12–x)O19; x = 0.0 to 1.0) Cu/ al取代钡六铁体((Ba1-xCux)(AlxFe12-x)O19结构与物理性质的相关性X = 0.0 ~ 1.0)

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-09-29 DOI: 10.1016/j.physb.2025.417874

G. Pushpalatha , A. GuruSampath Kumar , T. RavindraReddy , K. Suresh Babu

{"title":"Correlation between structure and physical properties in Cu/Al-substituted barium hexaferrites ((Ba1–xCux)(AlxFe12–x)O19; x = 0.0 to 1.0)","authors":"G. Pushpalatha , A. GuruSampath Kumar , T. RavindraReddy , K. Suresh Babu","doi":"10.1016/j.physb.2025.417874","DOIUrl":"10.1016/j.physb.2025.417874","url":null,"abstract":"<div><div>This study investigated the structural, magnetic, optical and vibrational properties of (Ba1–xCux)(AlxFe12–x)O19 hexaferrite nanoparticles synthesized by a simple wet-chemical c-precipitation method at the substitution level of x = 0.0–1.0. X-ray diffraction confirmed a single-phase hexagonal structure with lattice compression attributed to the smaller ionic radii of Cu2+ and Al3+. The crystallite size remained consistent at approximately 120 nm across the samples. Magnetic analysis revealed superparamagnetic behaviour at higher substitution levels, with decreased magnetization and coercivity resulting from site-specific occupation by Al3+ and Cu2+ ions. Nonlinear optical measurements using the Z-scan technique at 532 nm have shown a strong optical limiting behavior with two-photon absorption coefficients ranging from 6.3 × 10−11 to 9 × 10−11 m/W, underscoring their potential for photonic applications. FTIR spectroscopy confirmed metal–oxygen bond vibrations and the band shifts consistent with cationic substitution. These results highlight the tunable multifunctionality of Cu/Al-substituted Ba-hexaferrites, making them promising candidates for magnetic and optoelectronic devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"717 ","pages":"Article 417874"},"PeriodicalIF":2.8,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221149","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