A5061800047- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Multiferroics and related materials
- Iron-based superconductors research
- 2D Materials and Applications
- Nuclear materials and radiation effects
- X-ray Diffraction in Crystallography
- Magnetic Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Crystallization and Solubility Studies
- High-pressure geophysics and materials
- Magnetic Properties of Alloys
- Machine Learning in Materials Science
- Heusler alloys: electronic and magnetic properties
- Perovskite Materials and Applications
- Ferroelectric and Piezoelectric Materials
- Geomagnetism and Paleomagnetism Studies
- Characterization and Applications of Magnetic Nanoparticles
- Nuclear Physics and Applications
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
Oak Ridge National Laboratory
2020-2024
Harbin University of Science and Technology
2024
Dalian Institute of Chemical Physics
2023
Chinese Academy of Sciences
2023
HUN-REN Centre for Energy Research
2023
Heinz Maier-Leibnitz Zentrum
2016-2022
Forschungszentrum Jülich
2015-2022
High Energy Accelerator Research Organization
2019
Peking University
2019
The Graduate University for Advanced Studies, SOKENDAI
2019
Using single-crystal neutron diffraction, we present a systematic investigation of the crystal structure and magnetism van der Waals topological insulators ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ ${\mathrm{MnBi}}_{4}{\mathrm{Te}}_{7}$, where rich quantum states have been recently predicted observed. Structural refinements reveal that considerable Bi atoms occupied on Mn sites in both materials, distinct from previously reported antisite disorder. We show unambiguously orders...
Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics quantum spin liquids (QSLs) in presence strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYbCh2 (Ch=O, S, Se) forming a perfect triangular lattice, have been suggested be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, powder-sample neutron scattering measurements on supported...
Most of the searches for Kitaev materials deal with $4d/5d$ magnets spin-orbit-coupled ${J=1/2}$ local moments such as iridates and $\alpha$-RuCl$_3$. Here we propose monoclinic YbCl$_3$ a Yb$^{3+}$ honeycomb lattice exploration Kiteav physics. We perform thermodynamic, $ac$ susceptibility, angle-dependent magnetic torque neutron diffraction measurements on single crystal. find that ion exhibits Kramers doublet ground state gives rise to an effective spin ${J_{\text{eff}}=1/2}$ moment. The...
Abstract Harvesting of low‐grade heat (<100 °C) is promising, but its application hampered by a lack efficient and low‐cost systems. The thermally regenerative electrochemical cycle (TREC) potential alternative system with high energy‐conversion efficiency. Here, the temperature coefficient (α), which key factor in TREC, studied tuning hydration entropy reaction. change α copper hexacyanoferrate (CuHCFe) intercalation different monovalent cations (Na + , K Rb Cs ) larger value −1.004 mV...
Abstract In two-dimensional (2D) metallic kagome lattice materials, destructive interference of electronic hopping pathways around the bracket can produce nearly localized electrons, and thus bands that are flat in momentum space. When ferromagnetic order breaks degeneracy splits them into spin-up majority spin-down minority bands, quasiparticle excitations between should form a narrow spin-excitation Stoner continuum coexisting with well-defined spin waves long wavelengths. Here we report...
The fine control of magnetism and electronic structure in a magnetic topological insulator is crucial order to realize various novel states including axion insulators, Weyl semimetals, Chern etc. Through crystal growth, transport, thermodynamic, neutron diffraction measurements, we show that under Sb doping the newly discovered intrinsic antiferromagnetic (AFM) ${\mathrm{MnBi}}_{4}{\mathrm{Te}}_{7}$ evolves from AFM ferromagnetic (FM) then ferrimagnetic. We attribute this formation...
The field of spintronics has seen a surge interest in altermagnetism due to novel predictions and many possible applications. MnTe is leading altermagnetic candidate that significant across its layered antiferromagnetic structure, high Neel temperature (TN ~ 310 K) semiconducting properties. We present results on molecular beam epitaxy (MBE) grown MnTe/InP(111) films. Here, it found the electronic magnetic properties are driven by natural stoichiometry MnTe. Electronic transport situ...
Abstract Eu‐based compounds often exhibit unusual magnetism, which is critical for nontrivial topological properties seen in materials such as EuCd 2 As . The authors investigate the structure and physical of EuZn through measurements electrical resistivity, Hall effect, magnetization, neutron diffraction. Their data show that orders antiferromagnetically with an A‐type spin configuration below T N = 19 K. Surprisingly, there strong evidence dominant ferromagnetic fluctuations above ,...
A comprehensive understanding of the ligand field and its influence on degeneracy population d-orbitals in a specific coordination environment are crucial for rational design enhancement magnetic anisotropy single-ion magnets (SIMs). Herein, we report synthesis characterization highly anisotropic CoII SIM, [L2Co](TBA)2 (L is an N,N'-chelating oxanilido ligand), that stable under ambient conditions. Dynamic magnetization measurements show this SIM exhibits large energy barrier to spin...
Abstract Ferrotoroidal order, which represents a spontaneous arrangement of toroidal moments, has recently been found in few linear magnetoelectric materials. However, tuning moments these materials is challenging. Here, we report switching between ferritoroidal and ferrotoroidal phases by small magnetic field, chiral triangular-lattice magnet BaCoSiO 4 with tri-spin vortices. Upon applying observe multi-stair metamagnetic transitions, characterized equidistant steps the net moments. This...
As the first intrinsic antiferromagnetic (AFM) topological insulator (TI), MnBi$_2$Te$_4$ has provided a material platform to realize various emergent phenomena arising from interplay of magnetism and band topology. Here by investigating (Mn$_{1-x}$Pb$_x$)Bi$_2$Te$_4$ $(0\leq x \leq 0.82)$ single crystals via x-ray, electrical transport, magnetometry neutron measurements, chemical analysis, external pressure, first-principles calculations, we reveal magnetic dilution effect on topology in...
The magnetic-field-induced assembly of magnetic nanoparticles (NPs) provides a unique and flexible strategy in the design fabrication functional nanostructures devices. We have investigated field-induced self-assembly core-shell iron oxide NPs dispersed toluene by means small-angle neutron scattering (SANS). form factor was characterized analyzed using SANS with polarized neutrons. Large-scale aggregates formed above 0.02 T as indicated very-small-angle measurements. A three-dimensional...
The magnetic order of the localized ${\mathrm{Eu}}^{2+}$ spins in optimally doped $\mathrm{Eu}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}){}_{2}{\mathrm{As}}_{2} (\mathit{x}=0.12)$ with superconducting transition temperature ${T}_{\mathrm{SC}}=22$ K was investigated by single-crystal neutron diffraction. moments were found to be ferromagnetically aligned along $\mathit{c}$ direction an ordered moment 7.0(1) ${\ensuremath{\mu}}_{B}$ well below phase ${T}_{C}=17$ K. No evidence...
The magnetic ground state of the ${\mathrm{Eu}}^{2+}$ moments in a series $\mathrm{Eu}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}{\mathrm{As}}_{2}$ single crystals grown from Sn flux has been investigated detail by neutron diffraction measurements. Combined with results macroscopic properties (resistivity, susceptibility and specific heat) measurements, phase diagram describing how Eu order evolves Co doping is established. ground-state structure spins found to develop A-type...
Abstract Two-dimensional van der Waals MnBi 2 n Te 3 +1 ( = 1, 2, 3, 4) compounds have been recently found to be intrinsic magnetic topological insulators rendering quantum anomalous Hall effect and diverse states. Here, we summarize compare the crystal structures of this family, discuss effects chemical composition on their magnetism. We that a considerable fraction Bi occupies at Mn sites in while there is no detectable non-magnetic atomic within resolution neutron diffraction experiments....
Neutron scattering is a powerful but expensive technique to study materials and discover new matter. Advanced detector technology has significantly improved the efficiency of neutron experiments, increasing complexity data reduction analysis. Machine learning (ML) brings directions for diffraction experiment operation. This work presents an ML-assisted analysis method precise recognition Bragg peaks corresponding regions interest; it can then automatically screen align measured crystal using...
Abstract Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics quantum spin liquids (QSLs) in presence strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYb Ch 2 ( =O, S, Se) forming a perfect triangular lattice, have been suggested be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, powder sample neutron scattering measurements on...
Van der Waals magnet VI$_3$ demonstrates intriguing magnetic properties that render it great for use in various applications. However, its microscopic structure has not been determined yet. Here, we report neutron diffraction and susceptibility measurements revealed a ferromagnetic order with the moment direction tilted from $c$-axis by ~36{\deg} at 4 K. A spin reorientation accompanied distortion within honeycomb plane is observed temperature of ~27 K, before completely disappears $T_C$ =...
Spin-orbit coupling is an important ingredient to regulate the many-body physics, especially for many spin liquid candidate materials such as rare-earth magnets and Kitaev materials. The chalcogenides NaYbCh$_2$ (Ch = O, S, Se) a congenital frustrating system exhibit intrinsic landmark of by eliminating both site disorders between Na$^{+}$ Yb$^{3+}$ ions with big ionic size difference Dzyaloshinskii-Moriya interaction perfect triangular lattice ions. temperature versus magnetic-field phase...
We have studied the crystal and magnetic structures of Fe-doped hexagonal manganites LuMn1-xFexO3 (x = 0, 0.1, 0.2, 0.3) by using bulk magnetization neutron powder diffraction methods. The samples crystalize consistently in a structure maintain space group P63cm from 2 to 300 K. N\'eel temperature TN increases continuously with increasing Fe-doping. In contrast single {\Gamma}4 representation LuMnO3, ground state can only be described spin configuration mixture {\Gamma}3 (P63'cm') (P63'c'm)...
We present thermodynamic and neutron-scattering measurements on the quantum spin ice candidate ${\mathrm{Nd}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$. The parametrization of anisotropic exchange Hamiltonian is refined based high-energy-resolution inelastic data together with using linear spin-wave theory numerical linked-cluster expansion. Magnetic phase diagrams are calculated classical Monte Carlo simulations fields along [100], [110], [111] crystallographic directions which agree...
We have grown single crystals of Na$_2$BaNi(PO$_4$)$_2$, a new spin-1 equilateral triangular lattice antiferromagnet (ETLAF), and performed magnetic susceptibility, specific heat thermal conductivity measurements at ultralow temperatures. The main results are (i) zero field, Na$_2$BaNi(PO$_4$)$_2$ exhibits ordering 430 mK with weak ferromagnetic moment along the $c$ axis. This suggests canted 120$^\circ$ spin structure, which is in plane including crystallographic axis due to existence an...