Article
Chemistry, Physical
Rui Song, Bili Wang, Kai Feng, Jia Yao, Mengjie Lu, Jing Bai, Shuai Dong, Ming An
Summary: With the rise of two-dimensional materials, unique properties that are completely distinct from bulk counterparts continue to emerge, providing a new perspective for the study of transition metal systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Radhamadhab Das, Sudipa Bhattacharya, Shreyashi Chowdhury, Sujan Sen, Tapas Kumar Mandal, Trilochan Bhunia, Arup Gayen, M. Vasundhara, Md. Motin Seikh
Summary: In recent years, there has been great interest in the entropy stabilized oxides, known as high-entropy oxides, due to their intriguing physical properties. This study focuses on exploring the high entropy effect in the charge ordered manganite Nd0.5Sr0.5MnO3, where the balance between ferromagnetic double exchange and antiferromagnetic superexchange interactions is delicate. The results show that the substitution of Nd3+ with five trivalent cations dramatically suppresses the ferromagnetic interaction, contrary to the expected variation in ionic radius and size variance. Furthermore, different multicationic compositions exhibit the emergence of long-range antiferromagnetic states with retained charge ordering. The investigation highlights the role of local lattice distortion or high entropy effect in manganites, in addition to ionic radius and size variance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Bangmin Zhang, Ping Yang, Jun Ding, Jingsheng Chen, Gan Moog Chow
Summary: Multiple coexisting phases with different interaction intensities exist in manganite, and the transition among them depends on the relative intensities of these interactions. The melting path of a charge-ordering insulator phase in manganite can be largely modulated by anisotropy. The response of a variable range of hopping process to applied magnetic field is one of the key factors that affect the melting process of the charge-ordering insulator.
Article
Materials Science, Multidisciplinary
Dipak Mazumdar, Kalipada Das, I. Das
Summary: The investigation shows that Gd-doping has a significant influence on both the magnetic properties and magnetocaloric effects of (Sm1-yGdy)0.55Sr0.45MnO3 compounds. The compounds exhibit distinct physical properties under an external magnetic field, with field-induced meta-magnetic transition and large magnetocaloric effects. Different nature in the magnetocaloric effect at low temperatures is attributed to the field-induced modification of short-range ordering.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Abolfazl Khodadadi, Mahmoodreza Sharifian
Summary: In this study, a comparative computational analysis was conducted to investigate the ground state magnetic properties of a nanometer-sized bowtie graphene quantum dot and its AA-stacking bilayer trapezoid counterpart. The analysis was based on the single-orbital Hubbard model and density functional theory (DFT). The results showed that both structures exhibit an antiferromagnetic ground state with a corresponding local spin polarization. The tight-binding energy spectra appear different, but a similar pattern emerges after considering the Hubbard interaction term. The spatial distribution of edge states suggests that the wave functions in both structures are sublattice polarized, particularly in the bilayer case where a specific unit cell was proposed. Furthermore, the impact of on-site Coulombic repulsion on magnetization and the size of the local magnetic moment was also considered.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yan Wang, Hui Zhang, Haiou Wang, Dexin Yang, Shuai Huang, Kunpeng Su, Weishi Tan, Dexuan Huo
Summary: This paper investigates the effects of La3+ doping on the structure, charge ordering, and magnetic properties of Sm0.5Ca0.5MnO3 manganite. The La3+ ion concentration does not alter the crystal structure but does decrease the charge ordering temperature. The magnetic properties analysis confirms the existence of a CO-AFM phase in the samples.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Litong Jiang, Kuijuan Jin, Wenning Ren, Guozhen Yang
Summary: The first-principles calculations revealed the tunable electronic structure in DyNiO3 under biaxial compressive and tensile strains, with breathing mode and Jahn-Teller distortion playing primary roles in charge and orbital ordering states. The biaxial strain can manipulate the phase competition between the two states, with a phase transition point found under tensile strain.
Article
Physics, Applied
Sushant Zinzuvadiya, Rutvi J. Pandya, Jitendra Singh, U. S. Joshi
Summary: The addition of functionalities to existing ferroelectric/ferromagnetic materials has shown promising results with exciting physical mechanisms, especially for pure and bilayer films of strong ferromagnetic oxides. These materials exhibit high dielectric constants and pronounced hysteresis loops in dielectric and magneto-dielectric measurements, with particular interest in the dielectric and magneto-dielectric properties of BaM/LSMO bilayer films.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
S. Passanante, L. P. Granja, C. Albornoz, D. Vega, D. Goijman, M. C. Fuertes, C. Ferreyra, L. Ghivelder, F. Parisi, M. Quintero
Summary: The magnetic and magnetocaloric properties of bilayers and single layer manganite thin films were studied, and it was found that the bilayers can broaden the temperature range of the magnetocaloric effect without reducing the refrigerant capacity, offering potential for refrigeration device applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Birendra Kumar, Jeetendra Kumar Tiwari, Harish Chandr Chauhan, Subhasis Ghosh
Summary: In this study, three magnetic transitions were reported in bilayer La1.4Sr1.6Mn2O7 at different temperatures, with corresponding magnetic phases identified through MAPs and Kouvel-Fisher method. The critical behaviors around these transition points were analyzed, revealing the presence of four magnetic phases in the material.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Sergey V. Streltsov, Roman E. Ryltsev, Nikolay M. Chtchelkatchev
Summary: In recent years, the A-site ordered half-doped double-perovskite manganites RBaMn2O6 have gained significant attention for their exceptional physical properties and potential applications. This study investigates the origin of the ground-state structure and the electronic and magnetic properties of PrBaMn2O6. The findings offer insights into understanding the contradictions in experimental data and provide a theoretical foundation for refining the ground state structures in other RBaMn2O6 compounds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Shih-Jye Sun, Hsiung Chou
Summary: Unexpected magnetic properties are observed at the heterostructure interface between a high-temperature superconductor and a colossal magnet, with copper moments appearing at the interface and evidence of charge transfer. A theoretical model is proposed to simulate the interface, revealing that the odd copper moment coexists with the ferromagnetic moment of the colossal magnet and that charge transfer significantly affects superconducting and ferromagnetic order.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
V. Apinyan, T. K. Kopec
Summary: This paper investigates the antiferromagnetic and excitonic correlations in AA-stacked bilayer graphene, considering the impact of an external electric field potential and different particle-filling regimes. The study reveals that antiferromagnetism and excitonic phases can coexist away from half-filling, with the presence of a critical Coulomb interaction potential determining the transition between single-valued and triple-valued excitonic states.
Article
Polymer Science
Nandini Bhandaru, Rabibrata Mukherjee
Summary: In this study, dewetting of a thin polymer bilayer consisting of a stacked polystyrene (PS) film on top of a topographically patterned poly(methyl methacrylate) (PMMA) bottom layer on a nonwettable substrate results in a myriad of partially or fully ordered patterns. The local thicknesses of the thinnest parts of both layers collectively influence the evolution pathway and extent of ordering in the final dewetted features. Different values of h(R-PMMA) and h(T-PS) lead to different morphologies of ordered structures during the dewetting process.
Article
Materials Science, Multidisciplinary
Hangfu Yang, Xiani Huang, Qiong Wu, Xinyao Luo, Qingwei Wang, Jieyang Fang, Nengjun Yu, Minxiang Pan, Hongliang Ge
Summary: By substituting Eu3+ in Pr0.5Sr0.5-xEuxMnO3, the magnetic properties and magnetocaloric effect can be controlled, with the maximum IMCE effect achieved at an Eu content of 0.02. Additionally, the doping has a complex competitive relationship with the charge ordered state and Curie temperature.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Physics, Condensed Matter
Guochu Deng, Youshuang Yu, Yiming Cao, Zhenjie Feng, Wei Ren, Shixun Cao, Andrew J. Studer, James R. Hester, Yousef Kareri, Clemens Ulrich, Garry J. McIntyre
JOURNAL OF PHYSICS-CONDENSED MATTER
(2019)
Article
Instruments & Instrumentation
Guochu Deng, Garry J. McIntyre
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2020)
Article
Physics, Multidisciplinary
Chang Liu, JianLei Shen, JiaCheng Gao, ChangJiang Yi, Di Liu, Tao Xie, Lin Yang, Sergey Danilkin, GuoChu Deng, WenHong Wang, ShiLiang Li, YouGuo Shi, HongMing Weng, EnKe Liu, HuiQian Luo
Summary: A comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 reveals complex spin dynamics, including in-plane and out-of-plane dispersions of spin waves in different states, as well as a spin wave gap. Effective exchange interactions were estimated using a semi-classical Heisenberg model, indicating a large spin stiffness and significant contribution from Weyl fermions in this three-dimensional correlated system.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Materials Science, Multidisciplinary
Yingcai Zhu, Bin Wei, Junyan Liu, Nathan Z. Koocher, Yongheng Li, Lei Hu, Wenke He, Guochu Deng, Wei Xu, Xueyun Wang, James M. Rondinelli, Li-Dong Zhao, G. Jeffrey Snyder, Jiawang Hong
Summary: The low lattice thermal conductivity of AgInSe2 is attributed to the avoided crossing feature and low-lying optical modes in its phonon dispersion, which results in a local reduction of phonon group velocity and strong scattering of heat-carrying acoustic phonons. Additionally, strong anharmonicity or phonon-phonon interactions in AgInSe2 are revealed by temperature-dependent phonon dispersions and phonon density-of-states measurements. The dominant role of Ag vibrations in reducing the lattice thermal conductivity of AgInSe2 is demonstrated by XAFS and phonon eigenvector analysis, closely related to the avoided crossing, low-lying optical modes, and large structural distortion.
MATERIALS TODAY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Guochu Deng, Gang Zhao, Shuang Zhu, Zhenjie Feng, Wei Ren, Shixun Cao, Andrew Studer, Garry J. McIntyre
Summary: The spin dynamics of Mn4Nb2O9 were studied using inelastic neutron scattering, and a dynamic model was proposed to explain the observed spin-wave excitation spectrum. The study showed that the spin dynamics of this compound are dominated by antiferromagnetic interactions on the two MnO6 octahedron networks, and a spin gap and magnetic critical scattering were observed.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Dongliang Gong, Ming Yi, Meng Wang, Tao Xie, Wenliang Zhang, Sergey Danilkin, Guochu Deng, Xinzhi Liu, Jitae T. Park, Kazuhiko Ikeuchi, Kazuya Kamazawa, Sung-Kwan Mo, Makoto Hashimoto, Donghui Lu, Rui Zhang, Pengcheng Dai, Robert J. Birgeneau, Shiliang Li, Huiqian Luo
Summary: This study presents a comprehensive investigation on the nematic fluctuations in a non-superconducting iron pnictide system, revealing the crucial role of the interplay between local spins and itinerant electrons on Fermi surfaces. The results indicate that the in-plane resistivity anisotropy highly depends on the Cr dopings and the type of charge carriers, and the orbital degree of freedom may behave differently from the spin degree of freedom.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Y. Tseng, J. Thomas, W. Zhang, E. Paris, P. Puphal, R. Bag, G. Deng, T. C. Asmara, V. N. Strocov, S. Singh, E. Pomjakushina, U. Kumar, A. Nocera, H. M. Ronnow, S. Johnston, T. Schmitt
Summary: In this study, we investigated the magnetic excitations in the quasi-one-dimensional ladder subsystem of Sr14-xCaxCu24O41 using Cu L-3-edge resonant inelastic X-ray scattering. The evolution of magnetic excitations from collective two-triplon excitations to weakly-dispersive gapped modes was tracked by comparing RIXS spectra with and without Ca content. Density matrix renormalization group calculations showed that the observed flat magnetic dispersion and damped excitation profile at high Ca content originated from enhanced hole localization. Our results also demonstrated that off-ladder impurities can affect low-energy magnetic excitations and superconducting correlations in SCCO.
NPJ QUANTUM MATERIALS
(2022)
Article
Mathematics, Applied
Guo Deng, Christopher J. Lustri
Summary: In this study, the oscillation behavior in woodpile chains is investigated using numerical approximation and exponential asymptotics. Accurate predictions of the amplitude of the oscillations and the mass ratios for which the oscillations vanish are obtained. Furthermore, exponential asymptotics are applied to study granular woodpile chains with Hertzian interactions.
STUDIES IN APPLIED MATHEMATICS
(2023)
Article
Physics, Multidisciplinary
Xintong Li, Yuchen Gu, Yue Chen, V. Ovidiu Garlea, Kazuki Iida, Kazuya Kamazawa, Yangmu Li, Guochu Deng, Qian Xiao, Xiquan Zheng, Zirong Ye, Yingying Peng, I. A. Zaliznyak, J. M. Tranquada, Yuan Li
Summary: We present magnetometry data on twin-free single crystals of Na3Co2SbO6, a candidate material for realizing the Kitaev honeycomb model for quantum spin liquids. Contrary to the belief that such materials can be modeled with the symmetries of an ideal honeycomb lattice, our data show a pronounced twofold symmetry and in-plane anisotropy of over 200%, despite the small orthorhombic distortion of the honeycomb layer. Magnetic neutron diffraction is used to study the field-induced phases observed in the magnetometry, which manifest as diffuse scattering signals in the paramagnetic state and are consistent with a theory predicting a nearby quantum spin liquid phase. These findings call for a theoretical understanding of the observed in-plane anisotropy and make Na3Co2SbO6 a promising candidate for studying exotic quantum phases through targeted external tuning.
Article
Materials Science, Multidisciplinary
A. R. Wildes, J. R. Stewart, M. D. Le, R. A. Ewings, K. C. Rule, G. Deng, K. Anand
Summary: Neutron spectroscopy measurements on NiPS3 single crystals reveal that it is less two-dimensional than its sister compounds, with a relatively large ferromagnetic exchange between the layered ab planes. The analysis also shows the existence of in-plane magnetic exchange interactions up to the third-nearest neighbor. The anisotropy is mainly XY-like with a small uniaxial component, resulting in the appearance of two low-energy spin wave modes.
Article
Mathematics, Applied
Guo Deng, Christopher J. Lustri, Mason A. Porter
Summary: Nanoptera, nonlocalized solitary waves with small but nondecaying oscillations, are found to arise from the Stokes phenomenon in singularly perturbed Hertzian chains. They appear when crossing special curves (Stokes curves) in the complex plane. Exponential asymptotics techniques are used to obtain approximations of the oscillation amplitudes, revealing the accuracy of the asymptotic predictions in describing the oscillatory behavior in these chains.
SIAM JOURNAL ON APPLIED DYNAMICAL SYSTEMS
(2021)
Article
Materials Science, Multidisciplinary
Zhen Ma, Zhao-Yang Dong, Si Wu, Yinghao Zhu, Song Bao, Zhengwei Cai, Wei Wang, Yanyan Shangguan, Jinghui Wang, Kejing Ran, Dehong Yu, Guochu Deng, Richard A. Mole, Hai-Feng Li, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen
Article
Materials Science, Multidisciplinary
E. Constable, A. D. Squires, J. Horvat, R. A. Lewis, D. Appadoo, R. Plathe, P. Roy, J-B Brubach, S. deBrion, A. Pimenov, G. Deng
Article
Materials Science, Multidisciplinary
Stuart R. Burns, Daniel Sando, Bin Xu, Bertrand Dupe, Lachlan Russell, Guochu Deng, Richard Clements, Oliver H. C. Paull, Jan Seidel, Laurent Bellaiche, Nagarajan Valanoor, Clemens Ulrich
NPJ QUANTUM MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
J. Porras, J. Bertinshaw, H. Liu, G. Khaliullin, N. H. Sung, J-W Kim, S. Francoual, P. Steffens, G. Deng, M. Moretti Sala, A. Efimenko, A. Said, D. Casa, X. Huang, T. Gog, J. Kim, B. Keimer, B. J. Kim
