Journal of the Korean Physical Society最新文献

{"title":"Impact of Cu-substitution on the dielectric properties and electronic structure of cobalt nanoferrites","authors":"P. J. Banshiwal,&nbsp;A. K. Meena,&nbsp;S. Chandra,&nbsp;D. Meena,&nbsp;M. K. Gora,&nbsp;S. P. Pareek,&nbsp;A. Kumar","doi":"10.1007/s40042-025-01364-z","DOIUrl":"10.1007/s40042-025-01364-z","url":null,"abstract":"<div><p>This work studied the dielectric characteristics and electronic structure of cobalt nanoferrites with Cu substitutions. Here, Cu_<i>x</i>Co_1–<i>x</i>Fe₂O₄ (0.0 ≤ <i>x</i> ≤ 1.0, in step <i>x</i> = 0.2) (CCFO) series was synthesized by utilizing the sol–gel self-combustion process. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and an impedance analyzer were used to analyze each sample. FTIR Spectroscopy has confirmed the existence of one absorption band due to Fe–O interaction. Further nitrate group, the bending vibrations of H–O–H and carbonyl group were identified at 1380–1418 cm⁻¹, 1533–1581 cm⁻¹, and 2312–2360 cm⁻¹. Several vibrational modes were found in the material, which revealed three different Raman modes: <i>E</i>_g, <i>T</i>_2g, and <i>A</i>_1g. The elemental chemical states of CCFO nanoparticles were investigated employing XPS and exhibited the Fe, Co, and Cu atoms valence states are Fe³⁺, Co²⁺, Cu²⁺, and Cu⁺. Adding Cu²⁺ ions to these ferrites increased the metal oxide bonds and decreased the relative oxygen vacancy. The dielectric behavior of the proposed series is evaluated with frequencies between 100 Hz and 1 MHz, and the findings are then described in terms of the dielectric constant. As the frequency increased, the dielectric constant dropped and at more significant frequencies, it became constant. The results of the dielectric properties revealed that interfacial polarization causes the typical Maxwell–Wagner type dielectric dispersion. The study indicates that these materials may be used to manufacture microwave antennas to decrease energy losses and other purposes. It shows that distinct copper concentrations in cobalt ferrite nanoparticles could successfully alter their electronic and dielectric properties.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"969 - 980"},"PeriodicalIF":0.8,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074143","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}

{"title":"Thermal fluctuation of Fe-Ge ordering in Fe5-xGeTe2 single crystals","authors":"Nguyen Huu Lam,&nbsp;Trinh Thi Ly,&nbsp;Nguyen-Hoang Dang,&nbsp;Ganbat Duvjir,&nbsp;Hyo-Bin Ahn,&nbsp;Changgu Lee,&nbsp;Jungdae Kim","doi":"10.1007/s40042-025-01361-2","DOIUrl":"10.1007/s40042-025-01361-2","url":null,"abstract":"<div><p>Fe_5-xGeTe₂ is a magnetic van der Waals material with a relatively high Curie temperature near room temperature. Fe_5-xGeTe₂ exhibits unique magnetic properties due to its chemical and structural complexities. In this study, we employed scanning tunneling microscopy (STM) to investigate the thermal fluctuation of Fe-Ge ordering in Fe_5-xGeTe₂. At low temperatures (79 K), the Fe_5-xGeTe₂ surface exhibits distinct order with √3 × √3 periodicity resulting from the ordered Fe(1) atoms located in the outermost Fe₅Ge sublayer, while Fe deficient area shows 1 × 1 hexagonal lattice. At room temperature, on the other hand, structural fluctuations occur as thermal energy drives Fe(1) atom diffusion via a vacancy-mediated process. This results in the temporal rearrangement of the √3 × √3 and 1 × 1 regions at their boundaries. These findings provide important insights into the structural and magnetic properties of Fe_5-xGeTe₂.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"963 - 968"},"PeriodicalIF":0.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073563","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}

{"title":"Tensor network method for solving the Ising model with a magnetic field","authors":"Myung-Hoon Chung","doi":"10.1007/s40042-025-01350-5","DOIUrl":"10.1007/s40042-025-01350-5","url":null,"abstract":"<div><p>We study the two-dimensional square lattice Ising ferromagnet and antiferromagnet with a magnetic field by using tensor network method. Focusing on the role of gauge fixing, we present the partition function in terms of a tensor network. The tensor has a different symmetry property for ferromagnets and antiferromagnets. The tensor network of the partition function is interpreted as a multiple product of the one-dimensional quantum Hamiltonian. We perform infinite density matrix renormalization group to contract the two-dimensional tensor network. We present the numerical result of magnetization and entanglement entropy for the Ising ferromagnet and antiferromagnet side by side. To determine the critical line in the parameter space of the temperature and magnetic field, we use the half-chain entanglement entropy of the one-dimensional quantum state. The entanglement entropy precisely indicates the critical line forming the parabolic shape for the antiferromagnetic case, but shows the critical point for the ferromagnetic case.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"957 - 962"},"PeriodicalIF":0.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073908","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}

{"title":"Stability analysis of Bose gas: effect of external trapping and three-body interaction with Gross–Pitaevskii equation in Tonks–Girardeau regimes","authors":"Rajmohan Sasireka,&nbsp;Olivier Tiokeng Lekeufack,&nbsp;Ambikapathy Uthayakumar,&nbsp;Subramaniyan Sabari","doi":"10.1007/s40042-025-01354-1","DOIUrl":"10.1007/s40042-025-01354-1","url":null,"abstract":"<div><p>In this work, we investigate the stability aspects of quintic Gross–Pitaevskii (GP) equation with the presence and absence of external trapping potential for a Bose gas (BG) in both the Tonks–Girardeau (TG) and the super Tonks–Girardeau (sTG) regimes. For this purpose, we compute both analytically and numerically a pure quintic GP equation with the presence of the scattering lengths. Using the time-dependent variational approach, we derive the equations of motion and effective potential of the system for both cases. Through the effective potential, we discuss the stability properties of pure quintic GP equation and obtain the modulational instability condition of BECs. The variational results are verified by means of direct numerical simulations using split-step Crank–Nicolson method and the observed results are in agreement with the analytical predictions.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"945 - 956"},"PeriodicalIF":0.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074225","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}

{"title":"Optimization of ozone generator sizing and performance using response surface modeling and metaheuristic algorithms: a comparative study of HLOA and LCA","authors":"Elmabrouk Khelifi,&nbsp;Mohammed Nadjib Brahami,&nbsp;Imen Souhila Bousmaha,&nbsp;Mostefa Brahami,&nbsp;Said Nemmich,&nbsp;Seyf Eddine Bechekir,&nbsp;Mokhtaria Jbilou,&nbsp;Meriem Belabed","doi":"10.1007/s40042-025-01302-z","DOIUrl":"10.1007/s40042-025-01302-z","url":null,"abstract":"<div><p>This study investigates the optimization of a dielectric barrier discharge (DBD) cylindrical-shaped ozone generator, crucial for air purification and water treatment. The research focuses on the effects of voltage, electrode length, and discharge gap on ozone concentration, ozone generation rate, and energy efficiency, aiming to enhance performance while minimizing energy consumption. Systematic experiments were conducted by varying generator parameters at the APELEC Laboratory, Djillali Liabes University of Sidi-Bel-Abbes, Algeria, yielding a peak ozone concentration of 53.32 mg/L and an energy efficiency of 5.82 g/Wh. To enhance understanding and performance, response surface modeling (RSM) was employed to develop a mathematical model that elucidates the relationships between performance metrics and generator parameters. This model facilitated the identification of optimal parameter combinations to maximize ozone concentration and efficiency. In a novel approach, two advanced metaheuristic algorithms the liver cancer algorithm (LCA) and the horned lizard optimization algorithm (HLOA) were utilized. The HLOA achieved an improved ozone concentration of 57.35 mg/L and an energy efficiency of 5.88 g/Wh, surpassing the LCA’s results of 56.9 mg/L and 5.76 g/Wh. The results provide valuable insights for enhancing ozone generators, demonstrating the effectiveness of combining RSM with metaheuristic approaches. This hybrid method not only clarifies parameter relationships but also establishes a new benchmark for future research in ozone generator optimization.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 9","pages":"856 - 874"},"PeriodicalIF":0.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896748","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}

{"title":"Rigorous modeling of stimulated Brillouin scattering-induced rogue waves in a high-power fiber amplifier","authors":"Byung Ho Kim,&nbsp;Kyoungyoon Park,&nbsp;Yoonchan Jeong","doi":"10.1007/s40042-025-01342-5","DOIUrl":"10.1007/s40042-025-01342-5","url":null,"abstract":"<div><p>Stimulated Brillouin scattering (SBS) is considered to be a huge limiting factor in the power scaling of a narrow-linewidth high-power fiber amplifier source. An in-depth comprehensive study on this matter is of great importance because the generation of a temporarily strong rogue wave (RW) in the gain fiber can give rise to catastrophic damage to the key components of the fiber amplifier source. Since the center frequency of SBS is sensitive to temperature, in this paper, we extensively model and investigate its spatio-temporal behaviors by constructing a set of generalized coupled equations between the optical and acoustic waves together with the transient analysis of the corresponding thermal effect along the fiber length, depending on two different strategies in terms of the way of the pump power increase. When the pump power was turned on slowly in a multi-step manner, it could diminish the peak power level of SBS-induced RWs by a factor of almost two relative to that of SBS-induced RWs formed when the pump power was turned on immediately in a single-step manner. The outcome of this study will be useful and helpful in analyzing and designing narrow-linewidth high-power fiber amplifier as well as investigating their thermal management.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 9","pages":"834 - 846"},"PeriodicalIF":0.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896763","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}

{"title":"Optoelectronics and thermoelectric response of halide-based perovskites CsXY3 (X = Sn and Pb; Y = Cl, Br and I) semiconductors for solar cells and renewable energy","authors":"Hayat Ullah,&nbsp;Zertasha Nazir,&nbsp;Ashfaq Ahmad,&nbsp;Muhammad Mushtaq,&nbsp;Khalid M. Alotaibi,&nbsp;Kashif Safeen,&nbsp;Akif Safeen","doi":"10.1007/s40042-025-01344-3","DOIUrl":"10.1007/s40042-025-01344-3","url":null,"abstract":"<div><p>The aim of this research paper is designed to explore a systematic comparison of structural, elastic, thermal, electronic, optical, and thermoelectric responses of halide-based cubic perovskites CsXY₃(X = Sn and Pb; Y = Cl, Br and I) semiconductors for their potential applications in optoelectronic and thermoelectric generators. Density functional theory (DFT) is used in the present work using first-principle calculations based on the full potential linearized augmented plane wave (FP-LAPW) method with WC-GGA and mBJ as exchange correlation potentials. Moreover, the thermoelectric properties of these compounds are also explored using the BoltzTrap code. The calculated structural parameters are consistent with previous experimental and theoretical results. Bulk modulus and ground-state energy decrease in both groups from Cl to I. Elastic properties show the ductile nature of these compounds except CsSnI₃. Electronic properties show that these compounds are semiconductor with direct band gap of 1.9 eV for CsPbCl₃, 1.6 eV for CsPbBr₃, 1.3 eV for CsPbI₃, 0.8 eV for CsSnCl₃, 0.4 eV for CsSnBr₃, and 0.15 eV for CsSnI₃ respectively. Optical properties like dielectric constant, refractive index, and optical conductivity, and absorption coefficients are calculated up to photon energy of 25 eV. The fluctuation of Seebeck coefficient S, electrical conductivity (σ/τ), electronic thermal conductivity (κ/τ), and thermoelectric power factor PF with respect to temperature is also studied. A comprehensive analysis of the optoelectronics and thermoelectric nature with a given band gaps was carried out, reflecting the uses of CsXY₃ (X = Sn and Pb Y = Cl, Br and I) compounds in optoelectronic and thermoelectric generators. Moreover, the super luminescent nature at high photon energy and the strong absorption in the infrared, visible, and ultraviolet energy ranges were also explored in details.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 9","pages":"892 - 908"},"PeriodicalIF":0.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896761","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}

{"title":"Erratum: Current status of RAON muon irradiation system (RAMIS) for μSR spectrometer at RAON","authors":"Dong Geon Kim,&nbsp;Kyoungho Tshoo,&nbsp;Seong Jae Pyeun,&nbsp;Minsik Kwag,&nbsp;Cheolmin Ham,&nbsp;Cheong Soo Lee,&nbsp;Hyo Sang Lee,&nbsp;Donghyun Kwak,&nbsp;Kwang-Bok Lee,&nbsp;Mijung Kim,&nbsp;Charles Akers,&nbsp;Sangjin Lee,&nbsp;Jae Cheon Kim,&nbsp;Taeksu Shin,&nbsp;Jae Chang Kim,&nbsp;Jae Young Jeong,&nbsp;Yong Kyun Kim,&nbsp;Junesic Park,&nbsp;Ju Hahn Lee,&nbsp;Kihong Pak,&nbsp;Yong Hyun Kim","doi":"10.1007/s40042-025-01341-6","DOIUrl":"10.1007/s40042-025-01341-6","url":null,"abstract":"","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 5","pages":"728 - 728"},"PeriodicalIF":0.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914627","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}

{"title":"Synthesis of multilayer graphene on an atomically thin SiON layer grown on a SiC substrate","authors":"Beom Ju Kim,&nbsp;Jin Wook Kim,&nbsp;Kyu Hwa Choi,&nbsp;Gun Woo Park,&nbsp;Seing Hyum Im,&nbsp;Do Hyun Kim,&nbsp;Sung Hoo Sin,&nbsp;Do Hee Lee,&nbsp;Jun-Hui Choi,&nbsp;Jae-Hyun Lee,&nbsp;Joung Real Ahn","doi":"10.1007/s40042-025-01348-z","DOIUrl":"10.1007/s40042-025-01348-z","url":null,"abstract":"<div><p>Multilayer graphene was synthesized on an atomically thin silicon oxynitride (SiON) layer. This SiON layer was itself grown on a SiC(0001) wafer. The number of graphene layers was approximately controlled through the manipulation of argon partial pressure and exposure time. Both SiC and Si wafers are standard and commercially available substrates in the semiconductor industry, underscoring the importance of growing graphene layers on these wafers without the need for a transfer process. The multilayer graphene’s characteristics were examined using Raman spectroscopy, with the number of layers determined by the ratios of the 2D and G peaks in the Raman spectra. The uniformity of the graphene layers was assessed using confocal Raman mapping. This method of directly growing multilayer graphene on SiON/SiC wafers can also be extended to other two-dimensional materials such as h-BN and MoS₂.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 9","pages":"819 - 826"},"PeriodicalIF":0.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40042-025-01348-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theory of two-dimensional surface polaritons and their propagation","authors":"Seojoo Lee,&nbsp;Ji-Hun Kang","doi":"10.1007/s40042-025-01343-4","DOIUrl":"10.1007/s40042-025-01343-4","url":null,"abstract":"<div><p>In this paper, we provide a theoretical description of the propagation of surface polaritons bound to a two-dimensional (2D) metallic plane. Specifically, we rigorously discuss how orthonormal eigenvectors for the space including the 2D plane can be obtained. These eigenvectors are shown to consist of a unique surface-bound mode, corresponding to the 2D surface polaritons (2DSPs), along with a continuum of unbound modes, referred to as radiation modes. We demonstrate that although the radiation modes do not directly characterize the propagation of the 2DSPs, they play an important role in manipulating the propagation of 2DSPs.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 9","pages":"827 - 833"},"PeriodicalIF":0.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896751","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}