Review
Materials Science, Multidisciplinary
Wen-Sen Wei, Zhi-Dong He, Zhe Qu, Hai-Feng Du
Summary: A magnetic skyrmion, a particle-like spin swirling object, has a nontrivial topology and is seen as a promising next-generation information carrier in high-performance spintronic devices. This study delves into the magnetic properties of skyrmion-hosting materials stemming from DMI, highlighting the relationship between materials' point groups and DMI, as well as the common features of magnetic skyrmions experimentally verified in magnetization and magnetotransport measurements. Discussions also include other particle-like magnetic configurations in chiral magnets and their crossover with superconductors.
Article
Materials Science, Multidisciplinary
J. S. R. McCoombs, A. Zelenskiy, M. L. Plumer, B. W. Southern, T. L. Monchesky
Summary: We conducted a symmetry analysis of the ABC-stacked kagome planes of Mn atoms in the L12 Mn3X and antiperovskite Mn3AB alloys. Apart from the known single-ion-anisotropy and Kitaev-type anisotropic exchange, we discovered a staggered Dzyaloshinskii-Moriya interaction and gamma-type anisotropic exchange between nearest-neighbor spins. These new terms do not affect the ground state energy of the 120 degrees spin structures but become apparent in spin-wave excitations. We demonstrated the effects through calculations of inelastic neutron-scattering cross sections, suggesting experimental methods to investigate the existence and strengths of these cloaked interactions.
Article
Physics, Applied
A. Sbiri, M. Oumennana, M. Mansour
Summary: This paper investigates the quantum correlations in a two-qubit anisotropic Heisenberg model, and discusses the effects of relative distance between spins, temperature, and magnetic field strength on quantum correlations.
MODERN PHYSICS LETTERS B
(2022)
Article
Materials Science, Multidisciplinary
Johannes Richter, Oleg Derzhko, Juergen Schnack
Summary: Over the last decade, the interest in the spin-1/2 Heisenberg antiferromagnet (HAF) on the square kagome lattice has been growing. This model system is a prominent example of quantum magnetism with a quantum paramagnetic ground state, flat-band physics near the saturation field, and quantum scars. Recent numerical investigations have revealed a gapless spin liquid in the square kagome magnet. The study also provides insights into specific heat, entropy, and susceptibility, revealing low-temperature shoulder below the major maximum and a change in curvature just at a specific temperature, attributed to low-lying singlet excitations and the singlet-triplet gap.
Article
Physics, Multidisciplinary
Bingjie Liu, Can Huang, Lingzi Jiang, Ke-Er Liu, Yanfei Pan, Chunlan Ma, Jiyu Fan, Yan Zhu
Summary: Based on density functional theory calculations, the electronic structure and magnetism of monolayer 2H-FeTe2 were studied. The dispersion relation E(q) and E(-q) between energy and wave vector q of in-plane spin spiral at opposite directions was obtained. The Heisenberg interaction (HBI) and Dzyaloshinsky-Moriya interaction (DMI) parameters (Ji and di) were extracted from the energy values using HBI with DMI model. It was found that collinear ferromagnetic and antiferromagnetic states coexist in monolayer 2H-FeTe2, and the positive value of J3 plays a key role in the generation of ferromagnetism. The presence of intrinsic in-plane DMI is due to the broken inversion symmetry within the monolayer. This work contributes to the understanding of chiral spin textures in 2D magnets and the design of orbital spintronic electronic devices.
Article
Chemistry, Multidisciplinary
Qiyao Liu, Taeheon Kim, Kyusup Lee, Dongsheng Yang, Dushyant Kumar, Fanrui Hu, Hyunsoo Yang
Summary: The high-frequency optical mode of α-Fe2O3 is studied, and it is found that Dzyaloshinskii-Moriya (DM) interaction generates a new type of torque on the magnetic resonance. The optical mode spectra is measured using a continuous-wave terahertz interferometer, and an asymmetric absorption with a large amplitude and broad linewidth is observed near the magnetic transition point, Morin temperature (T-M ≈ 254.3 K). Based on the spin wave model, the spectral anomaly is attributed to the DM interaction-induced torque, allowing for the extraction of a DM interaction field strength of 4 T. This work opens up a new avenue for characterizing spin resonance behaviors at antiferromagnetic singular points for next-generation and high-frequency spin-based information technologies.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Johannes Richter, Jurgen Schnack
Summary: The spin-1/2 Heisenberg antiferromagnet on the square-kagome (SK) lattice has been a subject of interest in quantum magnetism due to its high frustration. Recent discoveries of SK spin-liquid compounds further motivate theoretical studies of this model. This study investigates the temperature dependence of various thermodynamic properties of the SK antiferromagnet with different strength of nearest-neighbor bonds J1 and J2. The findings reveal different ground states and low-temperature behaviors depending on the ratio of J2/J1.
Article
Optics
D. A. M. Abo-Kahla, M. Y. Abd-Rabbou, N. Metwally
Summary: The study examines the orthogonality time for different types of spin interactions with increasing number of environment qubits. It shows that the XX chain model has the shortest orthogonality time, while the Ising model has the longest time. The external field increases orthogonality numbers, while Dzyaloshinsky-Moriya interaction decreases orthogonality time. Initial state settings and external fields significantly affect the decrease/increase of orthogonality time.
LASER PHYSICS LETTERS
(2021)
Article
Physics, Applied
Martin Lonsky, Axel Hoffmann
Summary: This study presents comprehensive micromagnetic simulations of Synthetic antiferromagnet (SAF) nanostructures with an interfacial Dzyaloshinskii-Moriya interaction, discussing rich phase diagrams with various magnetic configurations, resonant excitations of individual skyrmions and skyrmioniums, and the internal modes of SAF skyrmion clusters in the context of magnetic sensing applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Fabian Kammerbauer, Won-Young Choi, Frank Freimuth, Kyujoon Lee, Robert Froemter, Dong-Soo Han, Reinoud Lavrijsen, Henk J. M. Swagten, Yuriy Mokrousov, Mathias Klaeui
Summary: The recently discovered interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) in multilayers with perpendicular magnetic anisotropy can stabilize intriguing spin textures such as Hopfions. To control the IL-DMI, the influence of an electric current on a synthetic antiferromagnet with growth-induced IL-DMI was investigated. The study revealed that the azimuthal dependence of IL-DMI shifts with increasing current, suggesting the presence of an additional current-induced term that linearly increases the IL-DMI in the direction of current flow, opening the possibility of easily manipulating 3D spin textures by currents.
Article
Optics
Yu-Xia Xie, Xin-Yu Liu
Summary: This study investigates the average steered coherence (ASC) in the Heisenberg XXZ model and finds that the ASC can be noticeably enhanced by adjusting the interactions, with parameter regions approaching its maximum value.
LASER PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Xitong Xu, Jia-Xin Yin, Zhe Qu, Shuang Jia
Summary: Kagome magnets provide a fertile ground for the search of exotic quantum states in condensed matter. The R166 kagome magnet, with its unique crystal structure and quantum interactions, exhibits various quantum states and topological effects. Research on the R166 kagome magnet can provide insights into the behavior of quantum magnets and pave the way for future explorations.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Yanliang Zhang, Qingping Zhou, Guodong Kang, Maofa Fang
Summary: This study investigates the dynamical behaviors of quantum-memory-assisted entropic uncertainty for a central two-qubit system. The results show that the uncertainty increases oscillatory and gradually with time, anti-correlated with the entanglement of the system. Near the critical point of quantum phase transition, sudden changes in uncertainty can be observed, serving as a new witness for the critical point. The number of spin sites in the environment affects the uncertainty, with strong coupling regimes being less sensitive to asymmetrical qubit-environment couplings.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mutsuki Saito, Ryunosuke Takagishi, Nobuyuki Kurita, Masari Watanabe, Hidekazu Tanaka, Ryuji Nomura, Yoshiyuki Fukumoto, Kazuhiko Ikeuchi, Ryoichi Kajimoto
Summary: Cs2Cu3SnF12 and Rb2Cu3SnF12 are two spin-1/2 antiferromagnets with different structures, and their magnetic excitation structures were investigated using inelastic neutron scattering. Four single-magnon excitation modes were observed in Cs2Cu3SnF12, and a broad excitation continuum was found. In Rb2Cu3SnF12, singlet-triplet excitations from the pinwheel VBS state were confirmed, along with ghost modes caused by the enlargement of the chemical unit cell.
Article
Physics, Multidisciplinary
Mansoura Oumennana, Essalha Chaouki, Mostafa Mansour
Summary: This study explores the dynamics of quantum entanglement and nonclassical correlations in a bipolar spin system, and finds that intrinsic decoherence deteriorates quantum correlations while the dipolar coupling constant weakens the oscillatory behavior but enhances the stability of entanglement and nonclassical correlations. Adjusting system parameters and coupling constants can mitigate the negative effects of intrinsic decoherence on quantum correlations, and the system's degree of purity is closely related to the amounts of entanglement and nonclassical correlations.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2022)
Article
Physics, Applied
David Boldrin
Summary: Barocaloric materials have the potential to provide greener and more efficient alternatives to conventional refrigerants, with giant and colossal barocaloric effects approaching those of commercial hydrocarbon refrigerants. The variety of barocaloric effects are associated with large changes in the degrees of freedom within the material.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Rania Harrabi, Thomas Halbritter, Fabien Aussenac, Ons Dakhlaoui, Johan van Tol, Krishna K. Damodaran, Daniel Lee, Subhradip Paul, Sabine Hediger, Frederic Mentink-Vigier, Snorri Th Sigurdsson, Gael De Paepe
Summary: Efficiently polarizing proton-dense molecular solids through dynamic nuclear polarization (DNP) solid-state NMR has been a great challenge. In this study, we introduce a new polarizing agent, cAsymPol-POK, which shows outstanding performance in polarizing biomolecular assemblies and organic microcrystals at high magnetic fields and fast magic angle spinning frequencies. Simulation and experimental results demonstrate the compatibility of cAsymPol-POK with challenging biomolecular applications and its ability to rapidly acquire crucial structural data of pharmaceutical drugs at natural isotopic abundance.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemical Research Methods
Daniel Jardon-Alvarez, Tahel Malka, Johan van Tol, Yishay Feldman, Raanan Carmieli, Michal Leskes
Summary: This study maps the fluctuations of the magnetic moment of unpaired electron spins by analyzing the ratio between longitudinal and transverse nuclear relaxation times. This analysis helps explain the evolution of NMR lineshapes and DNP enhancements as a function of the concentration of paramagnetic species and temperature.
JOURNAL OF MAGNETIC RESONANCE
(2022)
Article
Physics, Applied
F. Johnson, J. Kimak, J. Zemen, Z. Soban, E. Schmoranzerova, J. Godinho, P. Nemec, S. Beckert, H. Reichlova, D. Boldrin, J. Wunderlich, L. F. Cohen
Summary: The study discovers a unique anomalous Nernst effect in Mn3NiN thin films, where the direction of the effect is determined by the local antiferromagnetic domain state. By inducing a temperature gradient using a laser beam, the octupole macrodomain arrangement can be imaged and identified on a Hall cross.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Atomic, Molecular & Chemical
Claudio Bonizzoni, Maksut Maksutoglu, Alberto Ghirri, Johan van Tol, Bulat Rameev, Marco Affronte
Summary: We report the development and test of planar microwave Inverse Anapole Resonators (IARs) made of superconducting Yttrium Barium Copper Oxide (YBCO) for electron spin resonance spectroscopy on small samples. The results show that these resonators have higher spin sensitivity compared to typical linear coplanar resonators in both continuous-wave and pulsed-wave mode.
APPLIED MAGNETIC RESONANCE
(2023)
Article
Biochemical Research Methods
Murari Soundararajan, Thierry Dubroca, Johan van Tol, Stephen Hill, Lucio Frydman, Sungsool Wi
Summary: This study presents 1H-detected NMR experiments on relatively large liquid volumes at high fields using ODNP enhancements. By utilizing scalar couplings between 13C and 1H, the polarization transfer between nuclei was achieved, resulting in higher sensitivity at higher frequencies.
JOURNAL OF MAGNETIC RESONANCE
(2022)
Article
Chemistry, Multidisciplinary
Christian D. Buch, Krishnendu Kundu, Jonathan J. Marbey, Johan van Tol, Hogni Weihe, Stephen Hill, Stergios Piligkos
Summary: In this study, multifrequency electron paramagnetic resonance spectroscopy was used to investigate the behavior of Gd(III) ions in Gd0.004Y0.996(trensal) single crystals, and the Hamiltonian parameters of the ground state and the phase memory time, Tm, characterizing its coherent spin dynamics were determined.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Frederic A. Perras, Yoh Matsuki, Scott A. Southern, Thierry Dubroca, Dragos F. Flesariu, Johan Van Tol, Christos P. Constantinides, Panayiotis A. Koutentis
Summary: The Overhauser effect in DNP of non-conducting solids has attracted attention due to its potential for efficient high-field DNP and interest in the principles behind it. In this study, the authors investigate the mechanism for methyl-driven Overhauser DNP in detail and predict its temperature dependence using density functional theory and spin dynamics simulations. Comparisons with experimental results reveal that cross-relaxation originates from both libration and rotation at temperatures above 60 K, with libration dominating at lower temperatures. These findings suggest that methyl-driven Overhauser DNP can increase in efficiency down to 0 K.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Brijith Thomas, Daniel Jardon-Alvarez, Raanan Carmieli, Johan van Tol, Michal Leskes
Summary: In DNP-NMR experiments, the polarization of unpaired electrons is transferred to nuclei, increasing the sensitivity of NMR signal. While this method is efficient in crystalline inorganic oxides, it is less effective in oxide glasses. The difference in efficiency can be attributed to shorter relaxation times and dielectric properties in glasses. These findings provide guidance in identifying suitable materials for the DNP approach.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Ziga Gosar, Tina Arh, Kevin Jaksetic, Andrej Zorko, Wenhao Liu, Hanlin Wu, Chennan Wang, Hubertus Luetkens, Bing Lv, Denis Arcon
Summary: Quasi-one-dimensional electron systems exhibit instability towards long-range ordered phases at low temperatures. In this study, muon spin rotation and relaxation (& mu;SR) were used to investigate the superconducting state in Rb2Mo3As3, which has one of the highest critical temperatures Tc = 10.4 K among quasi-one-dimensional superconductors. The results show stronger damping below Tc due to the formation of a vortex lattice. Comparison of different models suggests that the s-wave scenario provides the best fit, but with an anomalously small superconducting gap ⠁0/Tc ratio of 2 ⠁0/kBTc = 2.74(1). However, the nodal p-wave or d-wave scenarios cannot be ruled out based on slightly worse fits, yielding more realistic ratios of 2 ⠁0/kBTc = 3.50(2) and 2 ⠁0/kBTc = 4.08(1), respectively.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Chanhyeon Lee, Suheon Lee, Heung-Sik Kim, Shunichiro Kittaka, Yoshimitsu Kohama, Toshiro Sakakibara, Ki Hoon Lee, J. van Tol, Denis I. Gorbunov, Seung-Hwan Do, Sungwon Yoon, Adam Berlie, Kwang-Yong Choi
Summary: We investigate the disorder-driven behavior of the 3D frustrated cubic lattice Lu3Sb3Mn2O14 (s = 5/2) using thermodynamic, electron spin resonance (ESR), and muon spin-relaxation (mu SR) measurements, as well as density functional theory (DFT) and classical Monte Carlo calculations. The DFT-based classical Monte Carlo calculations predict a magnetic ordering transition in Lu3Sb3Mn2O14, but our specific heat measurements show a weak magnetic anomaly at 0.5 K, and mu SR detects no long-range magnetic order or spin freezing down to 0.3 K. For temperatures above 2 K, our data suggest the formation of 3D random singlets. The appearance of multiple ESR lines below 80 K supports the existence of inhomogeneous magnetism. Our results expand the understanding of random-singlet physics to 3D frustrated classical magnets with a large spin number s = 5/2.
Article
Materials Science, Multidisciplinary
F. Johnson, J. Zazvorka, L. Beran, D. Boldrin, L. F. Cohen, J. Zemen, M. Veis
Summary: A magnetic thin film with weak ferrimagnetic and noncollinear antiferromagnetic phases is studied, showing a small net magnetization due to strain-associated canting. Symmetry analysis and calculation of magneto-optical Kerr effect (MOKE) spectra suggest that both phases share the same magnetic space group. Additionally, the material exhibits good magneto-optic and magneto-transport properties at room temperature, making it a promising candidate for spintronic applications.
Article
Materials Science, Multidisciplinary
M. Georgopoulou, B. Fak, D. Boldrin, J. R. Stewart, C. Ritter, E. Suard, J. Ollivier, A. S. Wills
Summary: Neutron scattering measurements were conducted on deuterated powder samples of claringbullite and Zn-doped claringbullite [ZnxCu4-x(OD)6FCl]. At low temperatures, claringbullite Cu4(OD)6FCl exhibits long-range magnetic order and spin-wave-like magnetic excitations due to its distorted pyrochlore lattice. Partial Zn doping results in the formation of ZnCu3(OD)6FCl compound, a geometrically frustrated spin-1/2 kagome antiferromagnet, which displays no transition to magnetic order down to 1.5 K and exhibits a gapless continuum of magnetic excitations, indicating the presence of fractional excitations in a quantum spin liquid.
Article
Materials Science, Multidisciplinary
J. Khatua, M. Pregelj, A. Elghandour, Z. Jaglicic, A. Elghandour, R. Klingeler, A. Zorko, P. Khuntia
Summary: Frustration-induced strong quantum fluctuations, spin correlations, and interplay between competing degrees of freedom are important factors in the formation of exotic states with fractional excitations in quantum materials. In this study, it was found that the rare-earth-based two-dimensional magnetic lattice Ba3RB9O18 possesses a perfect triangular lattice structure with localized R3+ spins showing pseudospin Jeff = 1/2 degrees of freedom and weak antiferromagnetic interactions. Crystal electric field calculations further suggest the presence of higher-crystal-electric-field states and a small gap between the ground and excited Kramers doublets.
Article
Materials Science, Multidisciplinary
J. Khatua, S. Bhattacharya, Q. P. Ding, S. Vrtnik, A. M. Strydom, N. P. Butch, H. Luetkens, E. Kermarrec, M. S. Ramachandra Rao, A. Zorko, Y. Furukawa, P. Khuntia
Summary: In this study, the researchers conducted experimental studies on a rare-earth material Li3Yb3Te2O12, and found that it exhibits dynamic liquid-like ground state without magnetic ordering or spin freezing. The ground state of this material is composed of low-energy J(eff) = 1/2 degrees of freedom and short-range spin correlations, providing opportunities to explore spin-orbit driven enigmatic correlated quantum states.
