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Effect of divalent cations(Co^(2+) and Ni^(2+)) on microstructure,physical properties and application of NdFeO_(3)

Journal of Rare Earths 2025年第1期43卷 89-97,I0004页

作者： M.M.Arman Materials Science Lab(1) Physics DepartmentFaculty of ScienceCairo UniversityGiza12613Egypt

The nanocrystalline samples Nd_(1-x)M_(x)FeO_(3)(x=0.0 and 0.1;M:Co^(2+)and Ni^(2+))were prepared using the citrate combustion *** X-ray diffraction(XRD)pattern confirmed that the nanoparticles were synthesized in an orthorhombic *** particle size of Nd_(1-x)M_(x)FeO_(3) is in the range of 29-59 *** selected area electron diffraction(SAED)indicates the samples were prepared in a polycrystalline *** samples Nd_(1-x)M_(x)FeO_(3)(x=0.0 and 0.1;M:Co^(2+)and Ni^(2+))have anti ferromagnetic *** Fe^(3+)spins are aligned antiparallel,forming the antiferromagnetic(AFM)properties,which are affected by many factors such as the bond angle between the Fe^(3+)(Fe^(3+)-O_(2)--Fe^(3+))and the Dzyaloshinskii-Moriya(D-M)*** doping of Co^(2+)and Ni^(2+)ions in NdFeO_(3) enhances the magnetic properties of the NdFeO_(3).The saturation magnetization(Ms)of Nd_(0.90)Co_(0.10)FeO_(3) increases 1.8times more than that of NdFeO_(3).The exchange bias field(HEX)of the Co-doped sample is two times greater than that of NdFeO_(3).The magnetic anisotropy constant(K)of the 10%Co-doped sample increases by 11 factors compared to that of NdFeO_(3).The Tauc plot illustrates that the samples have a direct optical *** divalent cation substitution(Co^(2+)and Ni^(2+))decreases the optical band gap of NdFeO_(3),leading to the recommendation of using the samples Nd_(0.90)Co_(0.10)FeO_(3) and Nd_(0.90)Ni_(0.10)FeO_(3) in photocatalysis of dye degradation from *** removal efficiencies of Cr6+at pH=6 are 88.06%,85.54%,and 85.52%for the samples NdFeO_(3),Nd_(0.90)Co_(0.10)FeO_(3),and Nd_(0.90)Ni_(0.10)FeO_(3),*** Freundlich isotherm mode is the best-fit model for NdFeO_(3) to adsorb Cr6+ions from aqueous solutions.

关键词： Optical properties Nanoparticles Magnetic properties Perovskites Removal efficiency Rareearths

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Reducing the measurement errors in nonadiabatic holonomic quantum computers

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Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 60-66页

作者： Guo-Fu Xu department of physics Shandong UniversityJinan 250100China

Nonadiabatic holonomic quantum computers serve as the physical platform for nonadiabatic holonomic quantum *** quantum computation has entered the noisy intermediate-scale era,building accurate intermediate-scale nonadiabatic holo-nomic quantum computers is clearly *** that measurements are the sole means of extracting information,they play an indispensable role in nonadiabatic holonomic quantum ***,developing methods to reduce measurement errors in nonadiabatic holonomic quantum computers is of great ***,while much attention has been given to the research on nonadiabatic holonomic gates,the research on reducing measurement errors in nonadiabatic holonomic quantum computers is severely *** this study,we propose a measurement error reduction method tailored for intermediate-scale nonadiabatic holonomic quantum *** reason we say this is because our method can not only reduce the measurement errors in the computer but also be useful in mitigating errors originating from nonadiabatic holonomic *** these features,our method significantly advances the construction of accurate intermediate-scale nonadiabatic holonomic quantum computers.

关键词： quantum holonomy quantum computation measurement errors

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Masking quantum information in multipartite systems via Fourier and Hadamard matrices

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Communications in Theoretical physics 2025年第2期77卷 101-111页

作者： Chen-Ming Bai Meng-Ya Wang Su-Juan Zhang Lu Liu department of Mathematics and physics Shijiazhuang Tiedao University

Quantum information masking（QIM） is a crucial technique for protecting quantum data from being accessed by local subsystems. In this paper, we introduce a novel method for achieving1-uniform QIM in multipartite systems utilizing a Fourier matrix. We further extend this approach to construct an orthogonal array with the aid of a Hadamard matrix, which is a specific type of Fourier matrix. This allows us to explore the relationship between 2-uniform QIM and orthogonal arrays. Through this framework, we derive two distinct 2-uniform quantum states,enabling the 2-uniform masking of original information within multipartite ***, we prove that the maximum number of quantum bits required for achieving a2-uniformly masked state is 2~n-1, and the minimum is 2n-1+ 3. Moreover, our scheme effectively demonstrates the rich quantum correlations between multipartite systems and has potential application value in quantum secret sharing.

关键词： multipartite systems quantum information masking Fourier matrix orthogonal arrays

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Growth of stimulated Raman instability by a density-modulated electron beam in laser-plasma interactions

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Communications in Theoretical physics 2025年第1期77卷 164-171页

作者： Pinki Yadav Devki Nandan Gupta Jyotsna Sharma department of physics and Astrophysics University of DelhiDelhi 110007India department of physics South Asian UniversityNew Delhi 110068India department of physics Motilal Nehru CollegeUniveristy of DelhiDelhi 110021India

A way to enhance the growth of stimulated Raman instability in laser-plasma interactions was *** relies on the application of density modulation of a co-propagating electron beam in *** the stimulated Raman scattering process,an electromagnetic pump wave decays into a low-frequency wave and a scattered electromagnetic sideband *** this process,the pump wave produces an oscillatory velocity associated with the plasma electrons and the beam *** oscillatory velocities combine with the existing low-frequency mode,producing ponderomotive force that drives high-frequency sideband *** sidebands couple to the pump wave,driving the beam-mode.A modulation of the electron beam density enhances the growth rate of the *** theoretical calculations show about 40%enhancements in growth of Raman instability at resonance(where the electron beam density modulation parameter approaches to unity)for the plasma density of the order of 10^(18)cm^(-3).

关键词： Raman instability fluid dynamics plasma fusion

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The dynamic effects of solar eclipses of October 25,2022,and October 14,2023,on GPS-derived total electron content

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Geodesy and Geodynamics 2025年第1期16卷 75-86页

作者： Vishal Chauhan Vishakha Rakesh Singh Shishupal Singh Vikram Singh Om Prakash Singh department of physics Graphic Era Hill University department of Petroleum Engineering Graphic Era (Deemed to be University) department of physics St.John's College department of Applied Sciences & Humanities Institute of Engineering & Technology

This study analyzes total electron content(TEC) variations during two solar eclipse events that occurred on October 25, 2022, and October 14, 2023. The solar eclipse of October 25, 2022, was a partial solar eclipse, while the eclipse of October 14, 2023, was an annular solar eclipse. For this study, the data of eight International GNSS Service(IGS) stations from different eclipse coverage zones are used to analyze TEC variations. It is found that the stations located in the maximum eclipse cover zone exhibited notable decreases in TEC values. The minimum variation of about 11.76% in TEC values is observed at the station situating in about 20 percent eclipse cover zone, while it varies from 22% to 38% at the stations falling in about 60 percent eclipse cover zone. The highest variation in TEC values of about 44% is found at the stations in about 80 percent eclipse cover zone. The time of occurrence of maximum depletion in TEC values at each station is in line with their longitudinal sequence. Atmospheric gravity waves(AGWs) are also observed by performing wavelet analysis on TEC data. The global TEC maps visualize and confirm observed TEC variations, providing spatial and temporal insights into the ionospheric response. This analysis highlights the influence of station location and eclipse coverage on the magnitude and spatial distribution of TEC variations.

关键词： Solar eclipse Ionosphere GPS TEC AGW

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Fast and robust production of quantum superposition states by the fractional shortcut to adiabaticity

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Communications in Theoretical physics 2025年第1期77卷 54-64页

作者： Guan-Qiang Li Hao Guo Yu-Qi Zhang Bo Yang Ping Peng department of physics and Institute of Theoretical physics Shaanxi University of Science and TechnologyXi'an 710021China

The fractional shortcut to adiabaticity(f-STA)for the production of quantum superposition states is proposed firstly via a three-level system with aΛ-type linkage pattern and a four-level system with a tripod *** fast and robust production of the coherent superposition states is studied by comparing the populations for the f-STA and the fractional stimulated Raman adiabatic passage(f-STIRAP).The states with equal proportions can be produced by fixing the controllable parameters of the driving pulses at the final moment of the whole *** effects of the pulse intensity and the time delay of the pulses on the production process are discussed by monitoring the populations on all of the quantum *** particular,the spontaneous emission arising from the intermediate state is investigated by the quantum master *** result reveals that the f-STA exhibits superior advantages over the f-STIRAP in producing the superposition states.

关键词： quantum population transfer shortcut to adiabaticity coherent superposition states dark states spontaneous emission

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Evolution from the Kondo phase to the RKKY phase in the small impurity spacing regime of the two-impurity Anderson model

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Chinese physics B 2025年第2期34卷 97-109页

作者： Hou-Min Du Yu-Liang Liu department of physics Renmin University of ChinaBeijing 100872China

Understanding the quantum critical phenomena is one of the most important and challenging tasks in condensed matter physics and the two-impurity Anderson model(TIAM) is a good starting point for this exploration. To this end,we employ the algebraic equation of motion approach to calculate the TIAM and analytically obtain the explicit singleparticle impurity Green function under the soft cut-off approximation(SCA). This approach effectively incorporates the impurity spacing as an intrinsic parameter. By solving the pole equations of the Green function, we have, for the first time, qualitatively calculated the spectral weight functions of the corresponding low-energy excitations. We find that when the impurity spacing is less than one lattice distance, the dynamic Rudermann–Kittel–Kasuya–Yosida(RKKY) interaction effectively enters, resulting in a rapid increase in the spectral weights of the RKKY phase, which ultimately surpass those of the Kondo phase;while the spectral weights of the Kondo phase are strongly suppressed. From the perspective of spectral weights, we further confirm the existence of a crossover from the Kondo phase to the RKKY phase in the TIAM. Based on these results, the reasons for the phenomenon of the Kondo resonance splitting are also discussed.

关键词： multiple-point correlation function soft cut-off approximation Kondo resonance splitting RKKY interaction

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Supersymmetric hybrid inflation in light of CMB experiments and swampland conjectures

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Chinese physics C 2025年第1期49卷 114-126页

作者： Waqas Ahmed Shabbar Raza Center for Fundamental physics and School of Mathematics and physics Hubei Polytechnic UniversityHuangshi 435003China department of physics Federal Urdu University of ArtsScience and TechnologyKarachi 75300Pakistan

In this study,we revisit supersymmetric(SUSY)hybrid inflation within the context of considering the latest Cosmic Microwave Background(CMB)observations and swampland *** demonstrate that SUSY hybrid inflation remains consistent with Planck 2018 data when radiative,soft mass,and supergravity(SUGRA)corrections are applied to the scalar *** is commonly perceived that SUSY hybrid inflation with a minimal Kahler potential results in a gauge symmetry breaking scale M of O(10^(15))GeV,leading to issues with the proton decay *** our analysis,we introduce a novel parameter space that alleviates the proton decay issue by achieving M~10^(16) GeV with M_(S)^(2)*** scenario necessitates a soft SUSY breaking scale|M_(S)|■10^(6) ***,we find that the tensor-to-scalar ratio r spans from 10^(-16) to 10^(-6),indicating a very small *** small ratio allows the modified swampland criteria to hold,although satisfying the trans-Planckian censorship conjecture(TCC)remains *** address this,we also explo non-minimal Kahler *** fixing the spectral index at n_(S)=0.9665,consistent with the central value of Planck 2018 data,and setting M=2×10^(16)GeV,we present our *** show that the canonical measure of primordial gravitational waves,r,for M_(S)=1 TeV,m_(3/2)=1 TeV,and k_(S)1 and N=2,ranges from 10^(-5) to 0.01,rendering it detectable by Planck and upcoming experiments such as LiteBIRD,Simons Observatory,PRISM,PIXIE,CORE,CMB-S4,and ***,we outline the parametric space and provide benchmark points for the non-minimal case to ensure compatibility with both the modified swampland conjecture and TCC.

关键词： suppersymmetry hybrid inflation swampland conjectures

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Holographic thermodynamics of a charged AdS black hole with a global monopole

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Communications in Theoretical physics 2025年第2期77卷 148-160页

作者： Hebin Zheng Yunxian Chen Jian Tang School of physics and Astronomy China West Normal University department of physics and Electronic Science Aba Teachers College

By regarding the Newton constant GNand cosmological constant Λ as variables, in this paper we study the thermodynamics and phase transition of the Reissner-Nordstr o m anti-de Sitter(RN-Ad S) black hole with a global monopole within the framework of Ad S/CFT correspondence. We find interesting critical phenomena and phase behavior in the(grand)canonical ensembles of fixed( Q,V,C),( Φ,V,C) and( Q,V,μ). When the other parameters are fixed, the free energy decreases with the global monopole increases. In the( Q,V,C) ensemble,the range of the unstable region decreases with the increase of the global monopole. In the( Φ,V,C) ensemble, when Φ < Φc, the free energy appears as two branches, where the upper and lower branches correspond to low and high entropy, respectively. When( Q,V,μ) is fixed, a new zero-order phase transition occurs in the high-entropy phase and the low-entropy phase at certainμ-dependent temperatures. When μ increases to a certain value, this zero-order phase transition disappears. This certain value is negatively related to the magnitude of the global ***, we find that p-V criticality does not appear with the change of global ***, it is important to note that the CFT states of charged black holes with global monopoles do not correspond to van der Waals fluids. Finally, we find that charged black holes with global monopoles can better reflect thermodynamic phase transitions and critical phenomena under the Ad S/CFT correspondence. By adjusting the change of the global monopole, the thermodynamic phase transition will also change.

关键词： black holes AdS-CFT correspondence global monopole

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Effective spin dynamics of spin-orbit coupled matter-wave solitons in optical lattices

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Communications in Theoretical physics 2025年第1期77卷 172-178页

作者： Kajal Krishna Dey Golam Ali Sekh department of physics Banwarilal Bhalotia CollegeAsansol-713303West BengalIndia department of physics Kazi Nazrul UniversityAsansol-713340West BengalIndia

We consider matter-wave solitons in spin-orbit coupled Bose-Einstein condensates embedded in an optical lattice and study the dynamics of the soliton within the framework of Gross-Pitaevskii *** express spin components of the soliton pair in terms of nonlinear Bloch equations and investigate the effective spin *** is seen that the effective magnetic field that appears in the Bloch equation is affected by optical lattices,and thus the optical lattice influences the precessional frequency of the spin *** make use of numerical approaches to investigate the dynamical behavior of density profiles and center-of-mass of the soliton pair in the presence of the optical *** is shown that the spin density is periodically varying due to flipping of spinors between the two *** amplitude of spin-flipping oscillation increases with lattice *** find that the system can also exhibit interesting nonlinear behavior for chosen values of *** present a fixed point analysis to study the effects of optical lattices on the nonlinear dynamics of the spin *** is seen that the optical lattice can act as a control parameter to change the dynamical behavior of the spin components from periodic to chaotic.

关键词： spin-orbit coupled Bose-Einstein condensates effective spin dynamics regular and chaotic dynamics

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