Journal of Superconductivity and Novel Magnetism最新文献_第2页

Magnetic and Anomalous Transport Properties of High-Temperature ε-Mn3Ga 高温ε-Mn3Ga的磁性和异常输运性质

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-15 DOI: 10.1007/s10948-026-07245-1

Shicheng Wang, Xiaoyu Ren, Yunrui Liu, Yushan Li, Kunpeng Su, Haiou Wang, Shuai Huang, Lin Yang

{"title":"Magnetic and Anomalous Transport Properties of High-Temperature ε-Mn3Ga","authors":"Shicheng Wang, Xiaoyu Ren, Yunrui Liu, Yushan Li, Kunpeng Su, Haiou Wang, Shuai Huang, Lin Yang","doi":"10.1007/s10948-026-07245-1","DOIUrl":"10.1007/s10948-026-07245-1","url":null,"abstract":"<div>We report a systematic study of the structural, magnetic, and transport properties of ε-Mn3Ga (Mn72Ga28), a high-temperature hexagonal D019 phase (space group P63/mmc) that has received little attention relative to its low-temperature η counterpart. X-ray diffraction confirms phase-pure ε-type ordering. Magnetic measurements uncover a series of temperature-driven spin rearrangements: antiferromagnetic ordering at ~ 400 K, a magnetic-state rearrangement near 300 K, a magnetoelastic anomaly around 200 K, and a possible spin-reorientation transition below 50 K. The alloy shows metallic behavior with a resistivity minimum near 40 K and an upturn at lower temperatures, consistent with disorder-induced scattering. Transport measurements reveal a pronounced anomalous Hall effect with a scaling exponent α ≈ 2, indicating dominant intrinsic and side-jump contributions. In addition, an extra Hall signal of 0.441 µΩ·cm appears at 50 K, which cannot be accounted for by the ordinary Hall effect or the measured magnetization, pointing to the possible role of noncoplanar spin textures in the frustrated triangular Mn sublattice. Our results establish ε-Mn3Ga as a system in which temperature-dependent spin evolution is directly coupled to Hall transport, offering a well-defined antiferromagnetic framework for exploring Berry-curvature-driven phenomena.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986165","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

Enhanced Critical Temperature Up to 87.5 K in the Single Crystals of the Incommensurate Spin-Ladder Cuprate Bi-Doped Sr(_{10-x})Ca(_x)Cu(_{17})O(_{29+delta }) 不相称自旋阶梯铜双掺杂Sr (_{10-x}) Ca (_x) Cu (_{17}) O单晶临界温度提高至87.5 K(_{29+delta })

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-14 DOI: 10.1007/s10948-026-07242-4

Gourav Vaid, Alex Andrews, Babu Varghese, D. Jaiswal-Nagar

{"title":"Enhanced Critical Temperature Up to 87.5 K in the Single Crystals of the Incommensurate Spin-Ladder Cuprate Bi-Doped Sr(_{10-x})Ca(_x)Cu(_{17})O(_{29+delta })","authors":"Gourav Vaid, Alex Andrews, Babu Varghese, D. Jaiswal-Nagar","doi":"10.1007/s10948-026-07242-4","DOIUrl":"10.1007/s10948-026-07242-4","url":null,"abstract":"<div>We report the growth of high-quality single crystals of the incommensurate spin-ladder system Bi-doped Sr(_{10-x})Ca(_x)Cu(_{17})O(_{29+delta }) using an optimized self-flux pressure technique, exhibiting an enhanced superconducting transition temperature of T(_c) = 87.5 K compared to previous reports [1–5]. The as-grown crystals were systematically characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction (SCXRD) confirming their morphology and chemical homogeneity. Structural refinements confirm the incorporation of a small amount of Bi into the SCCO lattice through partial substitution of Bi(^{3+}) at the Sr(^{2+})/Ca(^{2+}) sites while preserving the orthorhombic crystal structure. Magnetization and resistivity measurements revealed an improvement in the superconducting transition temperature of Bi-doped Sr(_{10-x})Ca(_x)Cu(_{17})O(_{29}) single crystals. The enhanced superconducting T(_c) is likely brought about by the optimized self-flux pressure technique process as well as Bi(^{3+}) substitution at the Sr(^{2+})/Ca(^{2+}) sites resulting in a possible enhanced ladder-hole concentration in Bi-doped Sr(_{10-x})Ca(_x)Cu(_{17})O(_{29}) crystals.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986151","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

Magneto-Electronic Thermal Conductivity within the Anderson Lattice Model: An Application to Colossal Magnetoresistive Manganites (Re1-X AX MnO3) Anderson晶格模型中的磁电子热导率：在巨磁阻锰矿（Re1-X AX MnO3）中的应用

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-14 DOI: 10.1007/s10948-026-07244-2

Rahul Saini, Sunil Panwar

{"title":"Magneto-Electronic Thermal Conductivity within the Anderson Lattice Model: An Application to Colossal Magnetoresistive Manganites (Re1-X AX MnO3)","authors":"Rahul Saini, Sunil Panwar","doi":"10.1007/s10948-026-07244-2","DOIUrl":"10.1007/s10948-026-07244-2","url":null,"abstract":"<div>Using the variational approach, the present study probes the magneto-electronic thermal conductivity (METC) of mixed-valence manganite systems Re₁₋ₓAₓMnO₃, where rare earth ions (La, Pr, Nd) are partially substituted by divalent alkaline earth cations (Ca, Sr, Ba). These compounds characteristically display colossal magnetoresistance (CMR). Using a two-band (ℓ-b) Anderson Lattice Model Hamiltonian, we study these materials in the strong electron-lattice Jahn-Teller (JT) coupling regime. This approach is similar to the two-fluid model and (ℓ-b) hybridisation. Key model Parameters such as local coulomb repulsion (U), Hund’s rule coupling (JH) between eg and t2g spins, and hybridisation (V) between ℓ-polarons and d-electrons of the same spin affect METC. We applied the variational method to examine the temperature dependence of electrical resistivity ρ(T) and electronic specific heat C(T) in doped CMR manganites. Our main findings shows: METC increases with temperature, peaks at low temperatures, and decreases at higher temperatures for fixed values of hybridisation ‘V’, Hund’s coupling ‘JH’, and doping ‘x’; When entering the metallic state, METC rises sharply and is strongly influenced by an applied magnetic field, which suppresses the peak and restores lattice thermal conductivity; This anomaly arises from thermal phonon scattering by spin fluctuation, not JT distortion modification at the transition temperature Tc; At low temperatures, METC shows typical crystalline character, with grain boundary scattering the main mechanism limiting heat transfer; and Because of high electrical resistivity, we only considered the electronic contribution to total thermal conductivity. Our qualitative findings align with experimental results.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986150","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

Design and Characterization of a High-sensitivity Search Coil Magnetometer for Low-frequency Geomagnetic Measurements 用于低频地磁测量的高灵敏度搜索线圈磁强计的设计与表征

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-12 DOI: 10.1007/s10948-026-07241-5

L. Dorosinskiy, A. Enes Yıldırım, U. Topal, M. Ali Aksan, H. Sözeri

{"title":"Design and Characterization of a High-sensitivity Search Coil Magnetometer for Low-frequency Geomagnetic Measurements","authors":"L. Dorosinskiy, A. Enes Yıldırım, U. Topal, M. Ali Aksan, H. Sözeri","doi":"10.1007/s10948-026-07241-5","DOIUrl":"10.1007/s10948-026-07241-5","url":null,"abstract":"<div>In this study, a three-axis search coil magnetometer intended for ultra-low-frequency (ULF) magnetic field measurements was designed, developed, and experimentally characterized. The sensor consists of three orthogonally arranged sensing elements, each composed of a ferromagnetic core and an individual pickup coil. Particular emphasis was placed on the optimization of core geometry, pickup coil winding configuration, and axis orthogonality to achieve low-noise performance in the sub-hertz frequency band. The scale factors of the developed sensor were experimentally determined as 126.6 mV/µT, 124.28 mV/µT, and 130.15 mV/µT for the X-, Y-, and Z-axes, respectively. The equivalent magnetic noise spectral density of each axis was measured in the 0.125–5 Hz frequency range using a dynamic signal analyzer under magnetically shielded conditions. The measured noise spectra exhibited power-law behavior in the log–log domain, with spectral slopes of − 1.17, − 0.99, and − 1.19 for the X-, Y-, and Z-axes, respectively. The X- and Z-axis sensors showed nearly parallel spectral responses, while the Y-axis exhibited a slightly flatter trend, most likely due to minor differences in core properties and pickup coil winding numbers. The minimum detectable magnetic field of the proposed sensor was determined as 52.3 pT at 1 Hz and 10.5 pT at 5 Hz. The obtained results demonstrate that the developed three-axis search coil magnetometer provides stable and low-noise performance in the ULF band, designed for the observation of possible pre-seismic ULF magnetic anomalies.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927749","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

Interplay of Magnetic Dilution and Lattice Expansion in Cu-Substituted Ni-Mn-Sn Ribbons: A Combined Heisenberg and Landau Phase Transition Model cu取代的Ni-Mn-Sn带中磁稀释和晶格膨胀的相互作用：一个海森堡和朗道相转变模型

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-05 DOI: 10.1007/s10948-026-07240-6

M. A. Aksan, G. Kirat, M. Ayyildiz

{"title":"Interplay of Magnetic Dilution and Lattice Expansion in Cu-Substituted Ni-Mn-Sn Ribbons: A Combined Heisenberg and Landau Phase Transition Model","authors":"M. A. Aksan, G. Kirat, M. Ayyildiz","doi":"10.1007/s10948-026-07240-6","DOIUrl":"10.1007/s10948-026-07240-6","url":null,"abstract":"<div>In this study, we present a dual-framework theoretical model that combines a microscopic Heisenberg Hamiltonian and a macroscopic Landau free energy expansion to clarify the magneto-structural phase transitions in Cu-substituted Ni50−xCuxMn38Sn12+B(3% at.) ribbons. Experimental results show a marked suppression of the martensitic transformation temperature with Cu substitution, despite only minimal lattice expansion ((:varDelta:a/aapprox:0.15%)). To address this discrepancy, our model demonstrates that the shift in transition temperatures is primarily caused by magnetic dilution rather than purely distance-dependent RKKY interactions. Using an inverse Mean Field Theory approach, we quantitatively demonstrate a systematic reduction in the effective nearest-neighbour exchange integral ((:{text{J}}_{1})) from 12.0 meV to 6.0 meV, resulting from the disruption of exchange paths by non-magnetic Cu (3d10). Additionally, the macroscopic Landau framework reveals that Cu substitution weakens the magneto-structural coupling term ((:lambda:{Q}^{2}{M}^{2})), significantly lowering the activation energy barrier for the phase transition. At the microscopic level, the presence of fully filled Cu-3d states leads to “orbital dilution” near the Fermi level, suppressing d-d orbital hybridization and alleviating the band-Jahn-Teller instability. This unified model successfully accounts for the reduction in thermal hysteresis, the persistence of field-induced metamagnetic behaviour, and the enhanced low-field actuation capabilities in heavily Cu-substituted Heusler alloys.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148926891","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

Microscopic Parameters of a Type-II Superconductor Measured by Small-Angle Neutron Scattering 用小角中子散射测量ii型超导体的微观参数

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-09-01 DOI: 10.1007/s10948-026-07237-1

D. Alba Venero, A.-M. Valente-Feliciano, O. O. Bernal, V. Kozhevnikov

引用次数: 0

Effect of Short-Range Magnetic Order on Pseudogap Formation in Cuprates 近程磁序对铜酸盐赝隙形成的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-28 DOI: 10.1007/s10948-026-07239-z

S. G. Ovchinnikov, V.I. Kuz’min, T. M. Ovchinnikova

{"title":"Effect of Short-Range Magnetic Order on Pseudogap Formation in Cuprates","authors":"S. G. Ovchinnikov, V.I. Kuz’min, T. M. Ovchinnikova","doi":"10.1007/s10948-026-07239-z","DOIUrl":"10.1007/s10948-026-07239-z","url":null,"abstract":"<div>In this paper, based on the invited talk at the Samarkand conference SISM 2026, we discuss first the superconducting phase within the generalized mean field approach with pairing induced both by short-range antiferromagnetic coupling and electron-phonon interaction and secondly the origin of a pseudogap (PG) state in high-(T_c) cuprates. This phenomenon is beyond the standard Fermi liquid state. Already in the beginning of the HTSC era, phenomenological nearly antiferromagnetic Fermi liquid (NAFL) theory has been discussed in the literature to explain nuclear magnetic resonance (NMR) and inelastic neutron scattering data. Within this approach, the PG origin is related to short-range spin fluctuations. To understand how short-range spin correlations effect the electronic structure and magnetic susceptibility in a microscopic approach, we simultaneously studied the low-doping temperature evolution of both single particle spectra and spin correlations using cluster perturbation theory (CPT) and exact diagonalization. We have determined 3 temperature regimes in the normal phase: Fermi liquid, weak PG, and strong PG, and the d-wave superconducting phase formed by a combined action of magnetic and phonon coupling.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838282","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

Crystal Structure and Magnetic Properties of the Quaternary Compound Al1.5Co2.5FeGd 季系化合物Al1.5Co2.5FeGd的晶体结构和磁性能

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-20 DOI: 10.1007/s10948-026-07238-0

Liuqing Liang, Weijun Li, Huiting Ouyang, Degui Li, Bing He

{"title":"Crystal Structure and Magnetic Properties of the Quaternary Compound Al1.5Co2.5FeGd","authors":"Liuqing Liang, Weijun Li, Huiting Ouyang, Degui Li, Bing He","doi":"10.1007/s10948-026-07238-0","DOIUrl":"10.1007/s10948-026-07238-0","url":null,"abstract":"<div>The quaternary compound Al1.5Co2.5FeGd was melted and synthesized using a vacuum arc furnace. Powder X-ray diffraction and Rietveld refinement were employed to determine its crystallographic parameters. The results reveal that Al1.5Co2.5FeGd retains a CaCu5-type structure (space group P6/mmm, No. 191). The lattice constants are refined to a = 5.1042(3) Å and c = 4.0560(2) Å. The residual factors Rp and Rwp were converged to 8.41% and 10.07%, respectively. Furthermore, magnetic measurements were performed on Al1.5Co2.5FeGd under a low applied field of 50 Oe, showing that its Curie temperature Tc is 395.2 K. High-field magnetic characterization further demonstrates that the saturation magnetization Ms, remanence Mr, and coercivity Hc decrease with increasing temperature over the measured temperature range, and weak ferrimagnetic behavior is observed at room temperature. Meanwhile, the hysteresis losses Wh at 2 K and 300 K are 184.58 kJ·m−³ and 91.54 kJ·m−³, respectively.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782714","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

Enhanced Superconducting Performance of MgB₂ Wires via Cold High-Pressure Densification and Drawing Process 冷高压致密拉拔工艺提高MgB 2导线超导性能

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-13 DOI: 10.1007/s10948-026-07234-4

Mohammed Shahabuddin, Nasser S. Alzayed, Niyaz A. Madhar, Shahid M. Ramay, Bilal Taha

{"title":"Enhanced Superconducting Performance of MgB₂ Wires via Cold High-Pressure Densification and Drawing Process","authors":"Mohammed Shahabuddin, Nasser S. Alzayed, Niyaz A. Madhar, Shahid M. Ramay, Bilal Taha","doi":"10.1007/s10948-026-07234-4","DOIUrl":"10.1007/s10948-026-07234-4","url":null,"abstract":"<div>MgB₂ wires fabricated by the advanced magnesium infiltration process (AMIP) were subjected to different drawing steps and cold high-pressure densification (CHPD) at 0.8 GPa. Four samples were compared: as-drawn A1 and further-drawn A2, together with their CHPD-pressed counterparts, AP1 and AP2. X-ray diffraction confirmed the phase purity of MgB₂, with lattice parameters of (a = 3.0882) Å and (c = 3.5261) Å. SEM analysis revealed a substantial reduction in porosity and improved grain compaction following CHPD. The wire-core area decreased by 19% from A1 to AP1 and by 6.5% from A2 to AP2, confirming effective densification. Magnetization measurements showed nearly identical superconducting transition temperatures (Tc approx 36.6 K) for all samples, indicating that CHPD modified the microstructure without affecting the phase composition. Drawing alone enhanced the low-field critical current density (Jc) by improving grain connectivity. At 0 T and 20 K, A2 exhibited a Jc of 2.51 × 105 A/cm², representing a 19% improvement over A1. Combining drawing with CHPD produced a further enhancement, with AP2 reaching 2.7 × 105 A/cm² at 0 T and 20 K, corresponding to an overall improvement of 28%. At 3T, Jc increased from (1.52 × 104) to (1.83 × 104) A/cm², representing a 20% improvement in field performance compared with the unpressed wires. The irreversibility field (Hirr) remained nearly unchanged at approximately 5.8 T, confirming that the observed performance gains originated primarily from improved grain connectivity and reduced porosity. The optimized combination of drawing and CHPD therefore provides a practical route toward industrial-grade MgB₂ wires for high-field applications operating near 20 K.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751702","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

Piper Nigrum Assisted Green Synthesis of Cr3+ Doped Nickel-Zinc Spinel Ferrite Nanoparticles for Photocatalytic Activity Piper Nigrum辅助绿色合成Cr3+掺杂镍锌尖晶石铁氧体纳米粒子的光催化活性

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-13 DOI: 10.1007/s10948-026-07230-8

Shital P. Nawale, Kalyani K. Deshmukh, Punam B. Dube, Pratik S. Patil, A. P. Keche, K. M. Jadhav

{"title":"Piper Nigrum Assisted Green Synthesis of Cr3+ Doped Nickel-Zinc Spinel Ferrite Nanoparticles for Photocatalytic Activity","authors":"Shital P. Nawale, Kalyani K. Deshmukh, Punam B. Dube, Pratik S. Patil, A. P. Keche, K. M. Jadhav","doi":"10.1007/s10948-026-07230-8","DOIUrl":"10.1007/s10948-026-07230-8","url":null,"abstract":"<div>In the current work, Cr-substituted nickel-zinc spinel ferrite magnetic nanoparticles (NPs) with the configuration Ni0.7Zn0.3CrxFe2−xO4 (x = 0.0–0.4) were developed using the extract of Piper nigrum (black pepper) as both a chelating agent and an eco-friendly fuel. X-ray diffraction (XRD) and Rietveld analysis verified that the constructed material exhibits single-phase formation with a cubic spinel structure. Lattice parameter decreases with Cr substitution, from 8.372 Å to 8.356 Å. The formation of the spinel phase was further confirmed by Fourier transform infrared (FTIR) spectroscopy, which revealed two distinct absorption bands within the 400–600 cm− 1 region. Raman spectroscopic investigation identified five distinct vibrational modes. Scanning electron microscopy (SEM) analysis of typical samples showed a compact microstructure composed of uniformly distributed spherical grains. Elemental analysis using (EDAX) spectra revealed the existence of all the desired elements. BET analysis showed an enhanced surface area for typical samples with x = 0.1 and 0.3. The VSM technique was employed to demonstrate the reduction in magnetic properties at room temperature after Cr3+ doping. The band gap energy determined from UV-vis spectroscopy decreases from 1.75 eV to 1.59 eV after doping with Cr3+ ions. Photocatalytic activity was evaluated using methylene blue (MB) under sunlight. The higher photocatalytic degradation activity of the sample with concentration x = 0.3 was 86.10% compared with the other samples.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751703","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