Article
Chemistry, Multidisciplinary
Liurukara D. Sanjeewa, V. Ovidiu Garlea, Randy S. Fishman, Mahsa Foroughian, Li Yin, Jie Xing, David S. Parker, Tiffany Smith M. Pellizzeri, Athena S. Sefat, Joseph W. Kolis
Summary: In this study, the magnetic phase diagram of the compound CsCo2(MoO4)2(OH) was determined through magnetic and neutron scattering measurements. The magnetic properties of CsCo2(MoO4)2(OH) are strongly influenced by the crystal lattice and can be easily controlled by magnetic fields. The compound exhibits unique magnetic exchange interactions between two types of Co2+ ions. The magnetic structure is antiferromagnetic along the b-axis at TN = 5 K, with two successive metamagnetic transitions observed. The compound shows promising potential for studying new physics related to sawtooth chain magnetism. Rating: 6/10.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Physics, Multidisciplinary
Linjie Liu, Weijin Chen, Yue Zheng
Summary: In this study, researchers discovered a flexomagnetic effect and Hall effect in synthetic antiferromagnetic systems, and proposed the connection between these effects and the topological structures in the system. These findings provide new insights for research in related fields.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Souvik Paul, Stefan Heinze
Summary: This study demonstrates that the stability of magnetic skyrmions in an ultrathin transition-metal film can be controlled via external electric fields, and reveals the influence of electric-field-induced changes in interactions on the energy barriers for skyrmion writing and deleting.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Physics, Applied
Satoshi Sugimoto, Yukiko K. Takahashi, Shinya Kasai
Summary: The spin reorientation in rare-earth intermetallics and its modulation of magnetocrystalline anisotropy provide a research platform for realizing room-temperature topological magnetic textures.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
A. Niyazi, D. Geffroy, J. Kunes
Summary: In this study, we explored the dynamical mean-field properties of antiferromagnetic magnons in a one-, two-, and three-orbital Hubbard model under intermediate coupling strength. The effects of anisotropy introduced by external magnetic field or single-ion anisotropy were investigated, with a continuous tuning between easy-axis and easy-plane models. It was found that ordered states and magnetic excitations are sensitive to even small breaking of SU(2) symmetry of the model, in line with spin-wave theory and general symmetry considerations.
Article
Chemistry, Physical
S. G. Mercena, A. T. Melo, A. F. Lima
Summary: Spin density functional theory calculations were used to study the magnetic and electronic properties of the RECu4Al8 intermetallic compounds. The calculations provided valuable insights into the total magnetic moment, spin and orbital contributions, magnetocrystalline anisotropy energy (MAE), easiest magnetization axis (EMA), and exchange splitting of the RE 4f states (Delta(ex)).
Article
Physics, Multidisciplinary
Zheng-Yang Li, Yan-Qing Ma, Jian-Wei Qiu
Summary: This study introduces complete next-to-next-to-leading-order coefficient functions to match flavor nonsinglct quark correlation functions in position space to parton distribution functions (PDFs), making predictions for valence-quark correlation functions. By performing Fourier transformation, matching coefficients for corresponding quasi-PDFs and pseudo-PDFs are obtained. The calculations can be generalized to evaluate matching coefficients for sea-quark and gluon correlation functions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ryota Yambe, Satoru Hayami
Summary: This article focuses on the classification of momentum-dependent anisotropic exchange interactions in cubic-lattice systems and the construction of effective spin models for different symmetries. By performing simulated annealing, the authors demonstrate that the symmetric anisotropic exchange interaction is the origin of multiple-Q states.
Article
Chemistry, Multidisciplinary
Honglei Liu, Guangtian Ji, Pingji Ge, Guixian Ge, Xiaodong Yang, Jinli Zhang
Summary: The effects of charging on the magnetic anisotropy energy (MAE) of rhenium atom in nitrogenized-divacancy graphene (Re@NDV) are investigated. High-stability and large MAE of 71.2 meV are found in Re@NDV. Charge injection can tune the magnitude of MAE and control the easy magnetization direction of the system. The controllable MAE of Re@NDV makes it promising for high-performance magnetic storage and spintronics devices.
Article
Physics, Multidisciplinary
S. Belkhatir, S. Bekhechi, B. W. Southern
Summary: We studied the 3d Heisenberg site disordered model with and without weak random anisotropy D in the presence of a uniform external longitudinal magnetic field using Monte Carlo methods. The spin and the chirality correlation lengths were measured. The study provided evidence that the mixed chiral phase is a chiral glass at a finite temperature transition TCG > 0, whereas the spin glass temperature transition is at T-SG = 0 for D = 0. In the anisotropic case, the model exhibited strong evidence of finite temperature transitions in both the spin and the chirality sectors. The estimated spin and chirality correlation-length exponents were compatible with the previous values obtained for the same model without anisotropy and the 3d Heisenberg spin glass.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Multidisciplinary Sciences
Daisuke Yamamoto, Takahiro Sakurai, Ryosuke Okuto, Susumu Okubo, Hitoshi Ohta, Hidekazu Tanaka, Yoshiya Uwatoko
Summary: The study proposes and demonstrates a method for actively controlling the classical-quantum crossover in magnetic insulators by applying external pressure, showing evolution of magnetization process from semi-classical to highly-quantum regime in CsCuCl3. By compressing spin chains to alter the value of local spin quantum number in a two-dimensional model, quantum correlations are characterized and the tunable classical-quantum crossover of two-dimensional spin systems is accessed.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Khadijeh Ahmadi, Farzad Mahfouzi, Loghman Jamilpanah, Morteza Mohseni, Tobias Boettcher, Philipp Pirro, Nicholas Kioussis, Johan Akerman, S. A. Seyyed Ebrahimi, Seyed Majid Mohseni
Summary: This research demonstrates that thermal annealing can induce iDMI in symmetric multilayer structures, which was evidenced by Brillouin light scattering spectroscopy and structural characterizations. First principles electronic structure calculations were used to explain the possible mechanism of iDMI induction.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Jiawang Xu, Xinqi Zheng, Lei Xi, Xucai Kan, Bin Bao, Tianping Ma, Yipeng Zang, Dingsong Wang, Yawei Gao, Juping Xu, Wen Yin, Baogen Shen, Shouguo Wang
Summary: Research on magnetic refrigeration has shifted its focus to lower operating temperatures, which is crucial for the use of liquid helium and hydrogen in aerospace and advanced industries. This study demonstrates significant improvement in magnetocaloric effects and magnetic materials operating in the desired temperature range. The findings have promising applications in helium-hydrogen liquefaction.
APPLIED MATERIALS TODAY
(2023)
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Dong Chen, Congcong Le, Chenguang Fu, Haicheng Lin, Walter Schnelle, Yan Sun, Claudia Felser
Summary: LiMn6Sn6 is a kagome ferromagnet with a large anomalous Hall effect, high ferromagnetism, and easy plane characteristics. Through experiments and calculations, it is found that there is a coexistence of electrons and holes in the material, and the main anomalous Hall effect is attributed to band crossings near the Fermi energy.
Article
Physics, Condensed Matter
Francesco Ferrari, Federico Becca
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Physics, Multidisciplinary
Juraj Hasik, Didier Poilblanc, Federico Becca
Summary: The recent progress in the optimization of two-dimensional tensor networks based on automatic differentiation has allowed for the precise and fast optimization of states like infinite projected entangled-pair states (iPEPS). By studying the J(1)-J(2) Heisenberg antiferromagnet model on the square lattice, accurate estimations of the magnetization curve in the Neel phase have been reported. The methodology used in this work can be extended to study generic order-to-disorder transitions in magnetic systems.
Article
Chemistry, Physical
Kousuke Nakano, Abhishek Raghav, Sandro Sorella
Summary: In this study, the accuracy of all-electron variational Monte Carlo (VMC) and lattice-regularized diffusion Monte Carlo (LRDMC) forces for various mono- and heteronuclear dimers is benchmarked. The results show that the LRDMC forces with appropriate regularization techniques improve the VMC forces, indicating the value of computing the DMC forces beyond VMC. The computational costs of QMC energy and forces scale differently, but applying the space-warp coordinate transformation (SWCT) makes the ratio of costs independent of the atomic number.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Luciano Loris Viteritti, Francesco Ferrari, Federico Becca
Summary: This paper investigates the accuracy of restricted Boltzmann machines (RBMs) in the spin-1/2 J(1)-J(2) antiferromagnetic Heisenberg model in one dimension. Two different variational ansatz, one fully complex RBM and one using two real-valued networks, are compared. The fully complex RBM shows superior performance, accurately describing both gapless and gapped ground states, and capturing the incommensurate spin-spin correlations and low-energy spectrum for J(2)/J(1) > 0.5.
Article
Physics, Multidisciplinary
Vito Marino, Federico Becca, Luca F. Tocchio
Summary: Using variational quantum Monte Carlo techniques, this study investigates the formation of stripes in the Hubbard model on the square lattice at hole doping delta = 1/8. The wavelengths and characters of the stripes depend on the ratio between the electron-electron interaction U/t and the next-nearest-neighbor hopping t'/t. Striped states are found to be non-superconducting.
Article
Physics, Multidisciplinary
Luciano Loris Viteritti, Riccardo Rende, Federico Becca
Summary: The ViT architecture, which utilizes the self-attention mechanism to capture long-range correlations, has become the leading model for natural language processing and computer vision tasks. We propose an adaptation of this architecture, called ViT wave function, with complex parameters for variational neural-network states of quantum many-body systems. Applying this idea to the one-dimensional J1-J2 Heisenberg model, we demonstrate that a relatively simple parametrization achieves excellent results for both gapped and gapless phases.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Francesco Ferrari, Sen Niu, Juraj Hasik, Yasir Iqbal, Didier Poilblanc, Federico Becca
Summary: Motivated by recent experiments, this study investigates the S = 1/2 Heisenberg model on the kagome lattice with nearest-neighbor super-exchange and Dzyaloshinskii-Moriya interaction. It is found that the ground state develops a finite magnetization for a certain range of JD/J values and exhibits no magnetic order for smaller values. The small value of JD/J is particularly relevant for understanding the low-temperature behavior of kagome antiferromagnets.
Article
Materials Science, Multidisciplinary
Ivan Gilardoni, Federico Becca, Antimo Marrazzo, Alberto Parola
Summary: Drawing on the modern theory of polarization, this study proposes an operator to distinguish between different types of insulators in two-dimensional space. The operator, an extension of the position operator, is validated on various system sizes and applied to interacting models. Computation in the Fock space allows for direct calculation of ground-state wave functions, enabling investigation of strongly correlated topological insulators and other interacting systems.
Article
Materials Science, Multidisciplinary
Juraj Hasik, Glen Bigan Mbeng, Sylvain Capponi, Federico Becca, Andreas M. Laeuchli
Summary: Infinite projected entangled-pair states (iPEPS) have been used to accurately describe many-body wave functions on two-dimensional lattices. However, they still face challenges when it comes to systems near continuous quantum phase transitions. This study utilizes the iPEPS Ansatz to describe the continuous transition between the antiferromagnetic and paramagnetic phases, and analyzes the scaling of the order parameter in a spatially anisotropic situation.
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Federico Becca, Roser Valenti
Summary: This study investigates the ground state properties of the Hubbard model on the kagome lattice with both on-site U and nearest-neighbor V Coulomb repulsion at van Hove filling. The results reveal the presence of different interaction-driven charge density waves (CDWs) and the absence of ferromagnetism and charge or spin-bond order. The CDWs triggered by the nearest-neighbor repulsion have charge disproportionations that are not in line with experimental observations in AV3Sb5. Additionally, electron-phonon interaction is considered as an alternative mechanism to stabilize charge-bond order, leading to findings that are closer to experimental results.
Article
Physics, Multidisciplinary
Luca F. Tocchio, Arianna Montorsi, Federico Becca
Summary: Recent intensive density-matrix renormalization group (DMRG) simulations have suggested the existence of a gapped chiral spin liquid near the metal-insulator transition of the Hubbard model on the triangular lattice. Using the variational Monte Carlo technique, a chiral spin liquid with magnetic quasi-long-range order was found for N = 4. However, for N = 5 and 6, the chiral state was not the state with the lowest variational energy, with a nematic spin liquid found for N = 5 and results similar to two-dimensional clusters for N = 6.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Roser Valenti, Federico Becca
Summary: The existence and stability of spin-liquid phases are key topics in the field of frustrated magnetism, with recent investigations suggesting their possible appearance in Heisenberg-like models on frustrated lattices. The effect of spin-phonon coupling on frustrated magnetism models and the stability of gapless spin liquids under small perturbations are important research areas. The results demonstrate the potential realization of gapless spin liquids in real materials, highlighting the importance of understanding the interaction between spins and phonons in frustrated magnetism systems.
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Alberto Parola, Federico Becca
Summary: We show that gapless spin liquids become trivial insulators on cylindrical geometries with an even number of legs and demonstrate the sharp difference between the ground-state properties obtained within cylinders or directly in the two-dimensional lattice. By choosing different boundary conditions for the fermionic degrees of freedom, both gapless and gapped states may be realized. Our results shed light on the difficulty to detect bona fide gapless spin liquids in such cylindrical geometries.
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Roser Valenti, Federico Becca
Article
Materials Science, Multidisciplinary
Yasir Iqbal, Francesco Ferrari, Aishwarya Chauhan, Alberto Parola, Didier Poilblanc, Federico Becca
Summary: In this study, the ground-state phase diagram of the J(1) - J(2) Heisenberg model on a Kagome lattice was assessed using Gutzwiller-projected fermionic wave functions. The accuracy of the U(1) Dirac state, describing the exact ground state, improves with the presence of a small antiferromagnetic superexchange J(2), leading to stability of a gapless spin liquid. For small ferromagnetic values of J(2)/J(1), the U(1) Dirac state remains stable against various perturbations but deteriorates on small systems, eventually giving way to a magnetically ordered state with root 3 x root 3 periodicity. Additionally, evidence of a first-order transition in the ferromagnetic J(2) regime is shown at J(2)/J(1) = -0.065(5).
