A5052721468- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Rare-earth and actinide compounds
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- 2D Materials and Applications
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ferroelectric and Piezoelectric Materials
- Inorganic Chemistry and Materials
- Crystal Structures and Properties
- Graphene research and applications
- Solid-state spectroscopy and crystallography
- High-pressure geophysics and materials
- Corporate Taxation and Avoidance
- Nuclear Physics and Applications
- Heusler alloys: electronic and magnetic properties
- Magnetism in coordination complexes
- Intellectual Capital and Performance Analysis
- Inorganic Fluorides and Related Compounds
- Transition Metal Oxide Nanomaterials
Oak Ridge National Laboratory
2016-2025
Zhejiang University of Technology
2025
Anhui University of Traditional Chinese Medicine
2024
Guangxi University
2024
Guangxi University of Chinese Medicine
2024
Peking University
2024
Lanzhou University
2023
Knoxville College
2023
University of Tennessee at Knoxville
2023
National High Magnetic Field Laboratory
2023
We have combined single-crystal neutron and x-ray diffractions to investigate the magnetic crystal structures of honeycomb lattice Na${}_{2}$IrO${}_{3}$. The system orders magnetically below $18.1(2)$ K with Ir${}^{4+}$ ions forming zigzag spin chains within layered network an ordered moment $0.22(1){\ensuremath{\mu}}_{\text{B}}/\text{Ir}$ site. Such a configuration sharply contrasts N\'eel or stripe states proposed in Kitaev-Heisenberg model. structure refinement reveals that Ir atoms form...
Single crystals of the Kitaev spin-liquid candidate $\alpha$-RuCl$_3$ have been studied to determine low-temperature bulk properties, structure and magnetic ground state. Refinements x-ray diffraction data show that low temperature crystal is described by space group $C2/m$ with a nearly-perfect honeycomb lattice exhibiting less than 0.2 \% in-plane distortion. The as-grown single exhibit only one sharp transition at $T_{N}$ = 7~K. order below this exhibits propagation vector $k$ (0, 1,...
Abstract Magnetic topological insulators (TI) provide an important material platform to explore quantum phenomena such as quantized anomalous Hall effect and Majorana modes, etc. Their successful realization is thus essential for our fundamental understanding potential technical revolutions. By realizing a bulk van der Waals MnBi 4 Te 7 with alternating septuple [MnBi 2 ] quintuple [Bi 3 layers, we show that it ferromagnetic in plane but antiferromagnetic along the c axis out-of-plane...
The magnetic structure and phase diagram of the layered ferromagnetic compound ${\mathrm{Fe}}_{3}{\mathrm{GeTe}}_{2}$ has been investigated by a combination synthesis, x-ray neutron diffraction, high-resolution microscopy, magnetization measurements. Single crystals were synthesized self-flux reactions, single-crystal diffraction finds order with moments $1.11(5){\ensuremath{\mu}}_{B}/\mathrm{Fe}$ aligned along $c$ axis at 4 K. These flux-grown have lower Curie temperature...
The interplay between topology and magnetism is essential for realizing novel topological states including the axion insulator, magnetic Weyl semimetal, etc. An intrinsically ferromagnetic material with only bands at charge neutrality energy has so far remained elusive. By rationally designing natural heterostructure consisting of [MnBi2Te4] septuple layers [Bi2Te3] quintuple layers, we report MnBi8Te13 as first intrinsic clean low-energy band structure. Based on thermodynamic, transport...
Materials hosting kagome lattices have drawn interest for the diverse magnetic and electronic states generated by geometric frustration. In AV_{3}Sb_{5} compounds (A=K, Rb, Cs), stacked vanadium layers give rise to unusual charge density waves (CDW) superconductivity. Here we report single-crystal growth characterization of ScV_{6}Sn_{6}, a hexagonal HfFe_{6}Ge_{6}-type compound that shares this structural motif. We identify first-order phase transition at 92 K. Single crystal x-ray neutron...
Bulk rutile RuO_{2} has long been considered a Pauli paramagnet. Here we report that exhibits hitherto undetected lattice distortion below approximately 900 K. The is accompanied by antiferromagnetic order up to at least 300 K with small room temperature magnetic moment of 0.05μ_{B} as evidenced polarized neutron diffraction. Density functional theory plus U (DFT+U) calculations indicate antiferromagnetism favored even for values the Hubbard 1 eV. may be traced Fermi surface instability,...
The anharmonic lattice dynamics of rock-salt thermoelectric compounds SnTe and PbTe are investigated with inelastic neutron scattering (INS) first-principles calculations. experiments show that, surprisingly, although is closer to the ferroelectric instability, phonon spectra in exhibit a more character. This behavior reproduced calculations temperature-dependent self-energy. Our simulations reveal how nesting dispersions induces prominent features self-energy, which account for measured INS...
We present single-crystal neutron scattering measurements of the spin-1/2 equilateral triangular lattice antiferromagnet Ba$_3$CoSb$_2$O$_9$. Besides confirming that Co$^{2+}$ magnetic moments lie in ab plane for zero field, we determine all exchange parameters minimal quasi-2D spin Hamiltonian, which confirms Ba$_3$CoSb$_2$O$_9$ is an almost perfect realization paradigmatic model frustrated quantum magnetism. A comparison with linear and nonlinear spin-wave theory reveals fluctuations...
Abstract Multiferroics materials, which exhibit coupled magnetic and ferroelectric properties, have attracted tremendous research interest because of their potential in constructing next-generation multifunctional devices. The application single-phase multiferroics is currently limited by usually small magnetoelectric effects. Here, we report the realization giant effects a Y-type hexaferrite Ba 0.4 Sr 1.6 Mg 2 Fe 12 O 22 single crystal, exhibits record-breaking direct converse coefficients...
Magnetoelectric multiferroicity is not expected to occur in a cubic perovskite system because of the high structural symmetry. By versatile measurements magnetization, dielectric constant, electric polarization, neutron and x-ray diffraction, Raman scattering, as well theoretical calculations, we reveal that A-site ordered LaMn(3)Cr(4)O(12) with symmetry novel spin-driven multiferroic strong magnetoelectric coupling effects. When magnetic field applied parallel (perpendicular) an field,...
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...
Magnetization plateaus in quantum magnets---where bosonic quasiparticles crystallize into emergent spin superlattices---are spectacular yet simple examples of collective phenomena escaping classical description. While magnetization have been observed a number spin-1/2 antiferromagnets, the description their magnetic excitations remains an open theoretical and experimental challenge. Here, we investigate dynamical properties triangular-lattice antiferromagnet Ba$_3$CoSb$_2$O$_9$ its one-third...
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...
Magnetism, when combined with an unconventional electronic band structure, can give rise to forefront properties such as the quantum anomalous Hall effect, axion electrodynamics, and Majorana fermions. Here we report characterization of high-quality crystals EuSn2P2, a new material specifically designed engender states plus magnetism. EuSn2P2 has layered, Bi2Te3-type structure. Ferromagnetic interactions dominate Curie-Weiss susceptibility, but transition antiferromagnetic ordering occurs...
Simulating quantum spin systems at finite temperatures is an open challenge in many-body physics. This work studies the temperature-dependent dynamics of a pivotal compound, ${\mathrm{FeI}}_{2}$, to determine if universal effects can be accounted for by phenomenological renormalization dynamical structure factor $S(\mathbf{q},\ensuremath{\omega})$ measured inelastic neutron scattering. Renormalization schemes based on quantum-to-classical correspondence principle are commonly applied low...
A four-circle neutron diffractometer with a new multi-wafer 331 Si monochromator has been installed and commissioned on thermal beamline at the High Flux Isotope Reactor Oak Ridge National Laboratory. The instrument is well suited to studies of nuclear magnetic structures as function composition temperature, resolving symmetry changes (lattice distortions local structural changes), mapping evolution complex phases, determining hydrogen bonding, analyzing spin densities, diffuse scattering,...
We studied the field induced magnetic order in ${R}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ pyrochlore compounds with either uniaxial ($R=\mathrm{Ho}$, Tb) or planar ($R=\mathrm{Er}$, Yb) anisotropy, by polarized neutron diffraction. The determination of local susceptibility tensor ${{\ensuremath{\chi}}_{\ensuremath{\Vert}},{\ensuremath{\chi}}_{\ensuremath{\perp}}}$ provides a universal description structures paramagnetic phase (2--270 K), whatever value (1--7 T) and direction. Comparison...