Results in Physics最新文献

{"title":"Quantitative determination of the order phase transitions of multicaloric materials: The validity of n-overshoot","authors":"Mario Reis ,&nbsp;Jia Yan Law ,&nbsp;Victorino Franco","doi":"10.1016/j.rinp.2025.108320","DOIUrl":"10.1016/j.rinp.2025.108320","url":null,"abstract":"<div><div>Caloric materials have a significant response (adiabatic temperature change or isothermal entropy change) in the vicinity of a phase transition, with the magnitude and characteristics of this response being strongly dependent on the nature of the transition. It is therefore important to be able to quantitatively ascertain the order of the transition (first or second order) to predict if the phase transformation implies a significant hysteresis, which is detrimental from the application point of view. In the case of magnetocalorics, the overshoot above two of the exponent <span><math><mi>n</mi></math></span>, describing the field dependence of the isothermal entropy change, has been demonstrated to be a suitable fingerprint of first order phase transitions. In this work, we demonstrate that the criterion holds for multicaloric materials in which the magnetocaloric transformation is altered by pressure.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108320"},"PeriodicalIF":4.4,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Optical and mechanical squeezing in two-cavity optomechanical system with photon-hopping interaction","authors":"Desalegn Ayehu","doi":"10.1016/j.rinp.2025.108343","DOIUrl":"10.1016/j.rinp.2025.108343","url":null,"abstract":"<div><div>We consider a model for the creation of squeezing of the optical modes and the mechanical resonators using a broadband squeezed field with the photon-hopping interaction. We find that both the cavity modes and the mechanical resonators exhibit quadrature squeezing in the presence of an injected squeezed field for suitable values of the laser power. We also show that the photon-hopping interaction causes a decrease in the amount of squeezing of both the cavity and the mechanical modes. The minimum power required to achieve squeezing in cavity and mirror modes increases with the growth of the photon-hopping interaction.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108343"},"PeriodicalIF":4.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"L-cysteine polymorph coatings for THz sensing metasurfaces","authors":"M. Zhezhu ,&nbsp;A. Vasil’ev ,&nbsp;H. Parsamyan ,&nbsp;T. Abrahamyan ,&nbsp;G. Baghdasaryan ,&nbsp;S. Gyozalyan ,&nbsp;D.A. Ghazaryan ,&nbsp;H. Gharagulyan","doi":"10.1016/j.rinp.2025.108351","DOIUrl":"10.1016/j.rinp.2025.108351","url":null,"abstract":"<div><div>The electromagnetic response of metasurfaces can be intentionally engineered by carefully designing their unit cells. Narrowband metasurfaces, characterized by high quality factors, can serve as an efficient platform for biosensing in optical to THz regimes, to explore new structural forms of biomolecules, further elevating the capabilities of THz sensing technologies. In this study, an all-metallic metasurface featuring structural asymmetry is proposed to analyze L-Cysteine with orthorhombic and monoclinic crystallographic structures. The influence of the concentration of L-Cysteine in the monoclinic phase on the THz response of the metasurface was performed using a drop-casting method. Our findings reveal a noticeable frequency shift as analyte concentration raises, underscoring the potential for high sensitivity in detecting biomolecules. Thus, this research demonstrates that asymmetric THz metasurfaces offer rather promising detection capabilities at lower THz frequencies between two crystallographic structures of L-Cysteine, with a Q-factor of 37, and a sensitivity of 1.430 THz ml/g. We believe that our results can be of great value to the development of biosensors for improved material characterization at low frequencies.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108351"},"PeriodicalIF":4.4,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"The plane wave diffraction on a flat area from randomly orientated rectangular apertures","authors":"A.Zh. Khachatrian ,&nbsp;S.H. Harutyunyan ,&nbsp;L.E. Khachikyan ,&nbsp;T.R. Muradyan ,&nbsp;G.A. Harutyunyan ,&nbsp;V.N. Aghabekyan","doi":"10.1016/j.rinp.2025.108348","DOIUrl":"10.1016/j.rinp.2025.108348","url":null,"abstract":"<div><div>The diffraction of a scalar wave field incident on a flat irregular diffraction grating with arbitrarily oriented rectangular apertures is considered. It is shown that if the random grating is illuminated from the far zone (the diffraction problem in the Fraunhofer formulation), then the diffraction field in the far zone (the Fraunhofer picture) can have a regular structure. It has been proven that the Fraunhofer diffraction pattern in the Fraunhofer formulation does not depend on the relative position of the apertures, but is determined by their relative orientation. This study highlights the important role of laser beam size and shape in diffraction problems, which is often overlooked in research.</div><div>A discussion of the statistical properties of the diffraction pattern is carried out on the basis of corresponding calculations of the scattered field intensity averaged over random parameters of the structure. The presented theoretical study explains the diffraction patterns in the form of concentrated circles observed on a system of rectangular <em>NaCl</em> microcrystals deposited randomly on a flat glass substrate. It is important that this work brings a certain understanding to the problematic of inverse diffraction problems, when symmetric diffraction patterns are associated with an ideally structured grating. At the same time, as this work shows, symmetric diffraction patterns can also be realized in the case of random gratings.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108348"},"PeriodicalIF":4.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Insights into the optoelectronic and thermoelectric properties of lead-free Rb2NaIrF6 double perovskite compound: A first-principles study","authors":"Mwende Mbilo ,&nbsp;Robinson Musembi ,&nbsp;John Peter Kachira ,&nbsp;Wisley Nyangau Onsate ,&nbsp;Fanuel Mugwanga Keheze ,&nbsp;Refilwe Edwin Mapasha","doi":"10.1016/j.rinp.2025.108349","DOIUrl":"10.1016/j.rinp.2025.108349","url":null,"abstract":"<div><div>This study investigated the structural, electronic, elastic, mechanical, thermodynamic, optical, and thermoelectric properties of the Rb₂NaIrF₆ <!-->lead-free double perovskite compound using first-principles methods. The structural stability of the perovskite was confirmed by the Goldschmidt tolerance and octahedral factors. Dynamic stability was confirmed through the negative energy of formation and positive frequency modes of the phonon dispersion curve. The dynamic stability results suggest that the studied compound could be potentially synthesised experimentally. The Rb₂NaIrF₆ compound is a direct semiconductor with electronic band gaps within the range of 2.14–3.76 eV, computed using different approximations. The mechanical stability was confirmed by the elastic calculation results. The Rb₂NaIrF₆ <!-->compound was found to be ductile, ionic, and anisotropic. The optical properties showed that Rb₂NaIrF₆ strongly absorbs light in the ultraviolet region, which is desirable for ultraviolet-photosensitive materials in optoelectronic devices. The computed thermoelectric figure of merit of the Rb₂NaIrF₆ <!-->compound is 0.81 at 1000 K, suggesting high thermoelectric efficiency. These findings demonstrate the potential of Rb₂NaIrF₆ lead-free double perovskite compound for optoelectronic and thermoelectric applications. Therefore, our investigation offers theoretical insights that can lead to the experimental synthesis and study of Rb₂NaIrF₆ <!-->lead-free double perovskites.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108349"},"PeriodicalIF":4.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"First-principles investigation of structural, electronic, optical, and mechanical properties of novel metallic ternary halides K3XBr6 (X = Sc, Y)","authors":"Jaffer Saddique ,&nbsp;Amir Ullah ,&nbsp;Khamael M. Abualnaja ,&nbsp;Ahmed Azzouz-Rached ,&nbsp;Nasir Rahman ,&nbsp;Mudasser Husain ,&nbsp;M.D. Alshahrani ,&nbsp;Amani H. Alfaifi ,&nbsp;Eman Almutib ,&nbsp;Vineet Tirth ,&nbsp;Ali Algahtani ,&nbsp;Abid Ali Khan ,&nbsp;Rajwali Khan","doi":"10.1016/j.rinp.2025.108347","DOIUrl":"10.1016/j.rinp.2025.108347","url":null,"abstract":"<div><div>This study investigates the structural, electronic, optical, and mechanical properties of novel ternary halide compounds K₃XBr₆ (X = Sc, Y) using the FP-LAPW method within the WIEN2k framework. Structural analysis confirms their cubic symmetry, with optimized lattice parameters obtained via the Birch-Murnaghan equation of state, indicating greater structural stability for K₃YBr₆ compared to K₃ScBr₆. The calculated formation energies of − 1.325  eV/atom for K₃ScBr₆ and − 2.012  eV/atom for K₃YBr₆ confirm their thermodynamic stability. Furthermore, the absence of imaginary frequencies in the phonon dispersion spectra verifies their dynamic (phonon) stability. Electronic calculations reveal that both compounds exhibit metallic behavior, with overlapping valence and conduction bands. K₃ScBr₆ demonstrates higher carrier mobility, while K₃YBr₆ offers a better overall balance of physical and electronic characteristics. The valence band structure is predominantly shaped by bromine p-orbital contributions, which play a central role in the electronic behavior. Optical analysis highlights their potential in optoelectronic applications such as lasers, solar cells, and plasmonic devices, with K₃ScBr₆ optimized for ultraviolet response and K₃YBr₆ covering both ultraviolet and visible regions. Mechanical evaluation shows that K₃ScBr₆ is harder, stiffer, and more brittle, whereas K₃YBr₆ is softer, more ductile, and exhibits higher metallicity. These results position K₃XBr₆ (X = Sc, Y) as promising candidates for next-generation electronic, optoelectronic, and photonic technologies.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108347"},"PeriodicalIF":4.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Efficient detection of specific volatile organic compounds using functionalized titanium carbide (Ti3C2Tx) MXenes","authors":"Narender Kumar ,&nbsp;Tanveer Hussain ,&nbsp;Lei Shen ,&nbsp;Yuan Ping Feng ,&nbsp;Nacir Tit","doi":"10.1016/j.rinp.2025.108346","DOIUrl":"10.1016/j.rinp.2025.108346","url":null,"abstract":"<div><div>Early diagnosis of cancer is crucially important for prescribing a therapy plan to possibly save human lives. Towards this end, one amongst the pathologies is to consider the efficient detection of volatile organic compounds (VOCs) related, for instance, to the pancreatic cancer existing in exhaled breath, bile, or urine of patients. The scope of the present investigation is to search for suitable materials used for detecting the specific VOCs with high sensitivity and selectivity. The density functional theory (DFT) is employed to study the adsorption of three representative pancreatic cancer biomarkers; namely, (i) 2-pentanone (2p-none), (ii) 4-ethyl-1–2-dimethylbenzene (4E1-2DMB), and (iii) N-nonanal (N-nonal) on the pristine titanium carbides MXenes (Ti₃C₂T_x, T_x = O, S, F) as well as doped with selected transition metals “TMs” (e.g., Co, Cu, Fe, Ni). At the level of pristine MXenes, a clear selective adsorption towards the three VOCs is obtained as compared to the interfering air molecules (N₂, O₂, CO₂, H₂O) with suitable adsorption energies ranging from −0.60 eV to −1.10 eV. Furthermore, the strongest adsorption of VOCs is always found to correspond to Ti₃C₂O₂ MXenes. Four different scenarios of TM-doping were considered and among which two cases are found to be effective to enhance the adsorptions of VOCs with effects on Fermi states. These latter two cases correspond to TM-doping O site and TM ad-atom. Adsorptions of VOCs on Cu-doped MXenes is found to have mimic effect on Fermi states and thus Cu should be excluded from the candidature. We concluded that TM-doping Ti₃C₂O₂ MXenes (with TM = Co, Fe, Ni) should be a good candidate material for fabrication of platform of disposable biosensor with high selectivity towards the detection of pancreatic cancer biomarkers.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108346"},"PeriodicalIF":4.4,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 morpho-structural and magnetic characteristics of (Co0.5Zn0.5Bi0.2Fe1.8O4)x(SiO2)100-x nanocomposites via composition and calcination temperature","authors":"Thomas Dippong ,&nbsp;Oana Cadar ,&nbsp;Ioan Petean","doi":"10.1016/j.rinp.2025.108345","DOIUrl":"10.1016/j.rinp.2025.108345","url":null,"abstract":"<div><div>The influence of various proportions of Co_0.5Zn_0.5Bi_0.2Fe_1.8O₄ (x = 25–100 %) dispersed in a SiO₂ matrix, as well as the effect of calcination temperature on the morpho-structural and magnetic characteristics of (Co_0.5Zn_0.5Bi_0.2Fe_1.8O₄)_x(SiO₂)_100-x nanocomposites (NCs) was explored using X-ray diffraction (XRD), atomic force microscopy (AFM) and vibrating sample magnetometry (VSM). At all calcination temperatures, the NC with x = 100 % showed the well crystallized ferrite phase, while the NCs with x = 25–75 % displayed well crystallized ferrite phase accompagnied by cristobalite and quartz. The particle size increased progressively from about 30 nm at low calcination temperatures (300, 600 and 900 °C) to about 100 nm at 1200 °C, along with the ferrite content in the composition. The correlation between ferrite crystallite and nanoparticle size revealed that the SiO₂ outer glaze is rather a constant layer of about 2–4 nm. The remanent magnetization, saturation magnetization, coercivity and anisotropy constant increased with the ferrite content dispersed in the SiO₂ matrix. In this regard, dispersing mixed Co-Zn-Bi ferrite nanoparticles into the SiO₂ matrix minimized the particle agglomeration, and allowed a fine tuning of particle size and magnetic characteristics. The magnetic behavior tailored by particle size, ferrite content and calcination temperature enables mixed ferrites to meet the requirements of specific applications in multifunctional materials such as magnetic coatings or thin films.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108345"},"PeriodicalIF":4.4,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Dosimetric platform and a genuine Raman protocol for passive estimation of fast-neutron fluence in irradiated SiC and SiC topped with epitaxial graphene","authors":"Jakub Jagiełło ,&nbsp;Artur Dobrowolski ,&nbsp;Tymoteusz Ciuk ,&nbsp;Rafał Prokopowicz ,&nbsp;Barbara Bieńkowska ,&nbsp;Jakub Włodarczyk ,&nbsp;Semir El-Ahmar ,&nbsp;Maciej J. Szary ,&nbsp;Mirosław Szybowicz","doi":"10.1016/j.rinp.2025.108332","DOIUrl":"10.1016/j.rinp.2025.108332","url":null,"abstract":"<div><div>The article introduces a genuine ex-situ measurement protocol to estimate the integrated flux of mostly fast (1-2 MeV) neutrons. It is verified up to the fluence of 6.5 × 10¹⁸ n/cm². A dedicated dosimetric platform comprises p-type hydrogen-intercalated quasi-free-standing epitaxial Chemical Vapor Deposition graphene on semi-insulating vanadium-compensated nominally on-axis 6H-SiC(0001) and a 100-nm-thick atomic-layer-deposited amorphous aluminum oxide encapsulation. The methodology correlates the total area under the averaged Raman spectra of SiC, between 60 cm^-1 and 1200 cm^-1, upon prior normalization to the maximum value of the longitudinal optical mode at 964 cm^-1. The patterned <em>a</em>-Al₂O₃/QFS-graphene/6H-SiC(0001) system offers two verification mechanisms — one within the graphene mesa and the other outside. Following the protocol, one can read the neutron fingerprint in the material and relate it to the integrated flux. The passive character of the method eliminates the radiological hazards associated with traditional activation methods. The approach enables localized and precise fluence control in fissile and thermonuclear facilities with a Root Mean Squared Percentage Error of the fitted model of approximately 4%.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108332"},"PeriodicalIF":4.4,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"1.3 mJ, 396 MHz hybrid chirped pulse amplification system laser with fiber-Yb:YAG crystal rod","authors":"Zhili Li ,&nbsp;Ting Luo ,&nbsp;Xinjian Pan ,&nbsp;Liming Liu ,&nbsp;Shixiang Xu","doi":"10.1016/j.rinp.2025.108344","DOIUrl":"10.1016/j.rinp.2025.108344","url":null,"abstract":"<div><div>A high-repetition-rate, hybrid chirped pulse amplification system (CPA) is presented, utilizing fiber pre-amplifier in conjunction with a Yb:YAG crystal thin rod as the main amplifier. The repetition frequency of the laser pulses is reduced from 396 MHz to several tens of kilohertz, which is necessary for burst pulse applications in industrial processing. Following the hybrid chirped amplification, the laser pulses are compressed using a grating pair compressor that provides a dispersion match with the stretcher composed of chirped fiber Bragg gratings (CFBGs). The system achieves an average output power of 32.5 W, a burst energy of 1.3mJ, and a pulse duration of 720 fs. Notably, the spectral gain narrowing effect was observed, with the narrowest spectral width recorded at 2.7 nm. The findings indicate that the nonlinear and thermal effects, which frequently arise in laser amplifiers, are effectively managed within this system. This configuration shows significant potential for improving efficiency in industrial processing as it is capable of delivering high-energy, high-power pulsed laser output. Thereby establishing it as a preferred option for ensuring optimal reliability and stability in ultrafast lasers for industrial applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"75 ","pages":"Article 108344"},"PeriodicalIF":4.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}