Article
Chemistry, Inorganic & Nuclear
Teresa Lee, Daniel B. Straus, Kasey P. Devlin, Xin Gui, Pria Louka, Weiwei Xie, Robert J. Cava
Summary: This study synthesizes and characterizes the magnetic and thermodynamic properties of quasi one-dimensional organic-inorganic hybrid ANiCl3 compounds and reports the crystal structure of (CH3)2NH2NiCl3. The magnetic coupling within chains can be predicted by the value of the Ni-Cl-Ni angle.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
A. Samartzis, S. Chillal, H. O. Jeschke, D. J. Voneshen, Z. Lu, A. T. M. N. Islam, B. Lake
Summary: The magnetic excitation spectrum and Hamiltonian of the quantum magnet BaCuTe2O6 were investigated using inelastic neutron scattering (INS) and density functional theory (DFT). The INS results showed overlapping spinon continua, indicating an antiferromagnetic spin-1/2 spin chain, while the DFT calculations revealed dominant intrachain interaction (J3) and subleading antiferromagnetic hyperkagome interaction (J2). The study also highlighted the high sensitivity of the interactions to small changes in structure, which may explain the differences observed in sister compounds SrCuTe2O6 and PbCuTe2O6.
Article
Chemistry, Multidisciplinary
Xiaopeng Zhang, Wen-Huang Xu, Wenwei Zheng, Sheng-Qun Su, Yu-Bo Huang, Qirui Shui, Tianchi Ji, Mikoto Uematsu, Qian Chen, Masashi Tokunaga, Kaige Gao, Atsushi Okazawa, Shinji Kanegawa, Shu-Qi Wu, Osamu Sato
Summary: In this study, an [FeCo] dinuclear complex exhibiting a magnetic field-induced spin crossover process was obtained, resulting in a significant polarization change of 0.45μC cm(-2). Mössbauer spectroscopy and theoretical calculations revealed that the asymmetric structural change and electron redistribution were responsible for the observed polarization change. This approach provides a new strategy for enhancing the polarization change.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Yang Xu, Ariana Ray, Yu-Tsun Shao, Shengwei Jiang, Kihong Lee, Daniel Weber, Joshua E. Goldberger, Kenji Watanabe, Takashi Taniguchi, David A. Muller, Kin Fai Mak, Jie Shan
Summary: Research on Moire engineering in van der Waals magnetic materials has shown the potential to create new magnetic ground states, with experiments showcasing the coexistence of ferromagnetic and antiferromagnetic states in small-twist-angle CrI3 bilayers, which can be controlled by electric gating.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Condensed Matter
V Ya Krivnov, D. Dmitriev
Summary: We investigate the spin-21 anisotropic model of a linear chain of triangles with competing ferro- and antiferromagnetic interactions, and ferromagnetic Heisenberg interactions between triangles. At a certain ratio between interactions, the one-magnon excitation band is dispersionless, leading to the existence of localized-magnon states that form macroscopically degenerate ground states. The spectrum of excitations has a specific structure depending on the value of the triangle-triangle interaction, which determines the low-temperature thermodynamics and the temperature dependence of specific heat. In the limit of strong anisotropy of interactions, the spectrum has a multi-scale structure consisting of subsets rank-ordered on a small parameter, and each subset is responsible for the appearance of heat.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Ines Sanchez-Movellan, Miguel Moreno, Jose Antonio Aramburu, Pablo Garcia-Fernandez
Summary: A characteristic of undoped high-temperature layered copper oxide superconductors is their strong in-plane antiferromagnetic coupling. First-principles simulations show that the fluorides in the parent tetragonal phase are also antiferromagnetic and the antiferromagnetic-to-ferromagnetic transition is only triggered with a large enough distortion. The application of an epitaxial strain allows controlling the difference in energy between the ferromagnetic and antiferromagnetic states.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Arup Sarkar, Matthew R. Hermes, Christopher J. Cramer, John S. Anderson, Laura Gagliardi
Summary: This study uses electronic structure calculations and theoretical inference to explain the temperature dependence of spin-crossover (SCO) behavior in the dimeric triple-decker Cr(II) complex. The findings suggest that variations in antiferromagnetic interactions and ligand-field effects play significant roles in influencing the SCO behavior of this complex.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Qi Zhao, Jin-Peng Xue, Zhi-Kun Liu, Zi-Shuo Yao, Jun Tao
Summary: A mononuclear complex with long alkyl chains was synthesized, showing incomplete one-step spin crossover in magnetic measurements. Various methods, including changing scanning rate, sample annealing, and light irradiation, were used to effectively improve the completeness of spin crossover.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Jingjie Ge, Riccardo Ruixi Chen, Xiao Ren, Jiawei Liu, Samuel Jun Hoong Ong, Zhichuan J. Xu
Summary: The rational design of FM-AFM core-shell catalysts enhances electron transport efficiency and improves OER activity, with critical factors including shell thickness and magnetic domain structure.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Sergii Burylov, Danil Petrov, Veronika Lackova, Katarina Zakutanska, Natalia Burylova, Alexey Voroshilov, Vyacheslav Skosar, Filippo Agresti, Peter Kopcansky, Natalia Tomasovicova
Summary: This paper presents complete theoretical and experimental studies on electrically and magnetically induced orientational transitions in suspensions of goethite nanorods in a nematic liquid crystal. Different types of samples with varied magnetic properties are prepared and observed. The magnetically induced transitions exhibit distinct orientational behaviors in the samples, with the compensated ferronematic requiring a higher magnetic field for the Freedericksz transition compared to pure nematic, and the magnetized ferronematic showing measurable response to magnetic fields even below the Freedericksz threshold.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
Anton A. Kulbakov, Denys Y. Kononenko, Satoshi Nishimoto, Quirin Stahl, Aswathi Mannathanath Chakkingal, Manuel Feig, Roman Gumeniuk, Yurii Skourski, Lakshmi Bhaskaran, Sergei A. Zvyagin, Jan Peter Embs, Ines Puente-Orench, Andrew Wildes, Jochen Geck, Oleg Janson, Dmytro S. Inosov, Darren C. Peets
Summary: Antlerite Cu3SO4(OH)(4) shows potential for tuning frustration in magnetic systems, with its magnetic ground state being exquisitely sensitive to fine details of atomic positions, indicating excellent tunability.
Article
Chemistry, Multidisciplinary
Shuangyu Wu, Bowen Qin, Yaling Zhao, Xiaoying Zhang, Jingping Zhang
Summary: Five new nuclear coordination complexes based on a 2-hydroxymethylpyridine ligand have been synthesized, showing different structures and cluster alignments. By changing the metal source and solvent ratios, the magnetic properties of the complexes also vary from antiferromagnetic to weak ferromagnetic interactions.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Physics, Applied
T. Z. Zhang, K. K. Meng, X. Shi, Y. B. Deng, L. B. Zhu, X. G. Xu, Y. Jiang
Summary: In this study, we prepared an antiferromagnetic insulated alpha-Fe2O3 film with a large out-of-plane magnetic component and investigated the spin Hall magnetoresistance (SMR) in alpha-Fe2O3/Pt bilayers. Our experimental and theoretical findings reveal a sign change characteristic in the angular-dependent and field-dependent magnetoresistance with varying temperature, which is attributed to the competition between the modulated interface magnetic state and antiferromagnetic bulk state of the alpha-Fe2O3 film. We also found that the critical temperature depends on the thickness of the alpha-Fe2O3 film and the magnetic field due to magnons transport and long-range order of non-collinear spin textures, respectively. Additionally, we proposed a phenomenological form to fit the SMR curves in the critical temperature range, providing further insights into the origin of SMR with complex magnetic structures.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Hassan Al-Hamdo, Tobias Wagner, Yaryna Lytvynenko, Gutenberg Kendzo, Sonka Reimers, Moritz Ruhwedel, Misbah Yaqoob, Vitaliy I. Vasyuchka, Philipp Pirro, Jairo Sinova, Mathias Klaeui, Martin Jourdan, Olena Gomonay, Mathias Weiler
Summary: We investigated the magnetization dynamics of Mn2Au/Py thin film bilayers and found two resonant modes that are attributed to the coupling between Py and Mn2Au.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Thilini K. Ekanayaka, Ping Wang, Saeed Yazdani, Jared Paul Phillips, Esha Mishra, Ashley S. Dale, Alpha T. N'Diaye, Christoph Klewe, Padraic Shafer, John Freeland, Robert Streubel, James Paris Wampler, Vivien Zapf, Ruihua Cheng, Michael Shatruk, Peter A. Dowben
Summary: The [Co(SQ)(2)(4-CN-py)(2)] complex shows dynamic effects at various temperatures, with the orbital moment exhibiting a nonzero critical field for net alignment of magnetic moments, in contrast to the spin moment behavior.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Eleni Mitoudi Vagourdi, Weiguo Zhang, Ksenia Denisova, Peter Lemmens, P. Shiv Halasyamani, Mats Johnsson
Article
Chemistry, Physical
Vladyslav O. Cheranovskii, Viktor V. Slavin, Douglas J. Klein
Summary: Studied a class of quasi-one-dimensional systems composed of two different structural units with odd numbers of sites, finding their instability and critical behavior similar to a homogeneous spin-1/2 chain.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2021)
Article
Chemistry, Physical
V Ksenofontov, Yu G. Pashkevich, M. Panthoefer, V Gnezdilov, R. Babkin, R. Klauer, P. Lemmens, A. Moeller
Summary: The ground state of Fe2+ in α-FeMoO4 and β-FeMoO4 has been investigated using a combination of experimental techniques and theoretical modeling, revealing structural and magnetic differences between the two polymorphs. The effective magnetic exchange mechanism is predominantly determined by the Dzyaloshinskii-Moriya interaction, leading to unique features in the Fe-site specific electric field gradients. The transition from β to α phase is accompanied by a softening of phonon modes and a resolution of the issue of disparate quadrupole splittings in the two modifications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Applied
V. O. Cheranovskii, V. V. Slavin, D. J. Klein
Summary: A class of frustrated one-dimensional periodic Heisenberg spin systems were studied, revealing gapless excitation energy spectra, instability in interactions oscillations, and estimated critical exponents for ground state energies. Additionally, a quantum phase transition associated with spin symmetry was discovered for some frustrated systems.
LOW TEMPERATURE PHYSICS
(2021)
Article
Physics, Applied
A. Glamazda, A. Sharafeev, R. Bohle, P. Lemmens, K. -y. Choi, F. C. Chou, R. Sankar
Summary: The vibrational and electronic properties of Pb-doped dichalcogenide PbxTaSe2 have been studied using Raman scattering experiments. Significant variations in main vibrational modes with Pb concentration x were observed, along with additional broad modes in the low-frequency regime. These modes are discussed in relation to remnant charge density wave, induced disorder, or the formation of a PbSe phase at the interface of Pb and TaSe2 layers.
LOW TEMPERATURE PHYSICS
(2021)
Article
Physics, Applied
A. Yu. Glamazda, V. P. Gnezdilov, P. Lemmens, G. A. Zvyagina, I. A. Gudim
Summary: Comprehensive Raman scattering measurements on a single crystal of binary ferroborate Nd0.75Dy0.25Fe3(BO3)(4) in the temperature range of 7-295 K revealed bands related to phonon, magnetic, and electronic excitations. The temperature evolution showed the intricate coupling and interplay between lattice, magnetic, and electronic degrees of freedom. Analysis of the spectra identified all predicted phonon modes and determined the splitting energies of polar E phonons.
LOW TEMPERATURE PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Victor V. Slavin, Vladyslav O. Cheranovskii
Summary: The study used the exact diagonalization (ED) approach and Quantum Monte-Carlo (QMC) method to investigate the lowest energy states and low-temperature magnetic properties of disordered 1D Heisenberg spin-1/2 systems. Results showed a significant decrease in the size of the intermediate magnetization plateau in systems with a singlet ground state and random distribution of structural units, compared to uniform spin systems. A transition to a singlet ground state was observed in the polyallyl spin chain with a macroscopic value of the ground state spin, due to the effect of compositional disorder.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
(2021)
Article
Physics, Multidisciplinary
Fryderyk Lyzwa, Yurii G. Pashkevich, Premysl Marsik, Andrei Sirenko, Andrew Chan, Benjamin P. P. Mallett, Meghdad Yazdi-Rizi, Bing Xu, Luis M. Vicente-Arche, Diogo C. Vaz, Gervasi Herranz, Maximilien Cazayous, Pierre Hemme, Katrin Fuersich, Matteo Minola, Bernhard Keimer, Manuel Bibes, Christian Bernhard
Summary: The authors use infrared ellipsometry and confocal Raman spectroscopy to demonstrate the presence of non-collinear and asymmetric interfacial polar moments in SrTiO3-based heterostructures, highlighting the importance of oxygen vacancies in these systems. They show that a polar lattice distortion that is non-collinear, highly asymmetric, and hysteretic with respect to the gate field plays a significant role in the gate-field-induced metal-to-insulator transition at the interface of SrTiO3 with LaAlO3 or AlOx.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
Vladyslav O. Cheranovskii, Victor V. Slavin, Andrei L. Tchougreeff, Richard Dronskowski
Summary: In this study, we investigated the magnetization profiles and spin switching possibilities of low-dimensional composite magnets formed by graphene nanoclusters and complex transition-metal compounds using different methods such as exact diagonalization, density matrix renormalization group approach, and quantum Monte-Carlo method. We found the presence of intermediate plateaus in the low-temperature magnetization profiles, consistent with previous experimental and theoretical studies. Additionally, a possibility of single and double spin switching was discovered for the proposed spin-chain model of the composite magnets, resulting from frustrated spin interactions.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
Silvia Muellner, Florian Buescher, Angela Moeller, Peter Lemmens
Summary: In this study, we use vortex photon fields with orbital and spin angular momentum to investigate chiral fluctuations within liquid crystals. We observe low energy Raman scattering in the regime of iridescence, which can be decomposed into helical and chiral components based on the scattering vector and the topological charge of the incident photon field. By observing anomalous dispersion, we attribute quasielastic scattering to a transfer of angular momenta to rotonlike quasiparticles. This approach provides a new avenue for advanced characterization of chiral and optically active devices and materials.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sung Ju Hong, Donglei Wang, Dirk Wulferding, Peter Lemmens, Rolf J. Haug
Summary: The magnetotransport properties of single- and double-rhombohedral trilayer graphene (TLG) are investigated. By folding single TLG, a double TLG with a twist angle of 4° is obtained. Raman spectroscopy confirms the ABC stacking order and interlayer coupling. The Landau fan diagram shows overlapped features of each constituent TLG, suggesting weak interlayer coupling.
Article
Materials Science, Multidisciplinary
Vladimir Gnezdilov, Vladimir Kurnosov, Yurii Pashkevich, Anup Kumar Bera, A. T. M. Nazmul Islam, Bella Lake, Bodo Lobbenmeier, Dirk Wulferding, Peter Lemmens
Summary: The S = 1 Haldane state is constructed from local singlet dimers in the bulk and topological states at the edges of a chain, making it a representative of topological quantum matter. In SrNi2V2O8, both conventional and unconventional magnetic Raman scattering are observed, with the unconventional scattering showing fermionic statistics, possibly indicating non-Abelian symmetry.
Article
Chemistry, Multidisciplinary
Daniel E. L. Vieira, Joao P. Cardoso, Alexey Fedorchenko, Elena L. Fertman, Erik Cizmar, Alexander Feher, Roman Yu Babkin, Yurii G. Pashkevich, Christopher M. A. Brett, Joaquim M. Vieira, Andrei N. Salak
Summary: Studying the precipitation of nanocrystallites of cobalt-aluminium layered double hydroxides in a magnetic field resulted in dense and homogeneous films when the magnetic field was perpendicular to the substrate. The magnetic anisotropy of the crystals is attributed to a deviation from the statistical cation distribution in favor of a honeycomb-like coordination for cobalt.
CHEMICAL COMMUNICATIONS
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
Anatolii Prudnikov, Yurii Pashkevich, Victoria Dmitrenko, Mariya Pas'ko, Vyacheslav Chishko
PROCEEDINGS OF THE 2020 IEEE 10TH INTERNATIONAL CONFERENCE ON NANOMATERIALS: APPLICATIONS & PROPERTIES (NAP-2020)
(2020)
Article
Materials Science, Multidisciplinary
Dirk Wulferding, Peter Lemmens, Florian Buescher, David Schmeltzer, Claudia Felser, Chandra Shekhar
