A5057207808- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Photonic Crystals and Applications
- Nonlinear Photonic Systems
- ZnO doping and properties
- Advanced Fiber Laser Technologies
- Multiferroics and related materials
- Superconductivity in MgB2 and Alloys
- Ga2O3 and related materials
- Magnetic Properties of Alloys
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Magnetic properties of thin films
- Topological Materials and Phenomena
- Gas Sensing Nanomaterials and Sensors
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- Iron oxide chemistry and applications
- Corporate Taxation and Avoidance
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Quantum Information and Cryptography
Zhongyuan University of Technology
2017-2025
Beihang University
2020-2024
Universiti Putra Malaysia
2024
Xi'an Jiaotong University
2016-2022
University of Toronto
2011-2022
Heinz Maier-Leibnitz Zentrum
2016-2019
Forschungszentrum Jülich
2013-2019
East China Normal University
2014-2016
Peking University
2009-2015
Shandong Normal University
2011-2013
The magnetic structure of the Eu${}^{2+}$ moments in superconducting EuFe${}_{2}$(As${}_{1\ensuremath{-}x}$P${}_{x}$)${}_{2}$ sample with $x=0.15$ has been determined using element-specific x-ray resonant scattering. Combining magnetic, thermodynamic, and scattering measurements, we conclude that long-range ferromagnetic order aligned primarily along c axis coexists bulk superconductivity at zero field. At an applied field $\ensuremath{\ge}$0.6 T, still moments, which are polarized...
The recent discovery of the spin supersolid candidate ${\mathrm{Na}}_{2}\mathrm{BaCo}({\mathrm{PO}}_{4}{)}_{2}$ has stimulated a great deal research on triangular-lattice transition-metal phosphates. Here we report comprehensive study structural, magnetic, and magnetocaloric properties polycrystalline ${\mathrm{Na}}_{2}AT({\mathrm{PO}}_{4}{)}_{2}$ ($A$ = Ba,Sr; $T$ Co,Ni,Mn). X-ray neutron diffraction measurements confirm that ${\mathrm{Na}}_{2}\mathrm{Ba}T({\mathrm{PO}}_{4}{)}_{2}$...
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 structure of the Eu2+ moments in superconducting EuFe2(As1-xPx)2 sample with x = 0.19 has been determined using neutron scattering. We conclude that are aligned along c direction below T_C 19.0(1) K an ordered moment 6.6(2) mu_B state. An impurity phase similar to underdoped exists within bulk which orders antiferromagnetically T_N 17.0(2) K. found no indication iron order, nor any incommensurate order sample.
Enhancing light outcoupling in quantum dot light‐emitting diodes (QLEDs) is one of the most important tasks to boost external efficiency (EQE); this improvement crucial for advancing fields illumination and displays. Herein, multilevel wrinkle structure with richer Fourier spectra has been fabricated, such structures possess advantages increasing scattering decreasing reflection. A strategy utilizing a demonstrated achieve spectrally independent green QLEDs. The device shows maximum EQE...
Abstract Two-dimensional van der Waals ferromagnet Fe 3 GeTe 2 (FGT) holds a great potential for applications in spintronic devices, due to its high Curie temperature, easy tunability, and excellent structural stability air. Theoretical studies have shown that pressure, as an external parameter, significantly affects ferromagnetic properties. In this study, we performed comprehensive high-pressure neutron powder diffraction (NPD) experiments on FGT up 5 GPa, investigate the evolution of...
The magnetic structure of superconducting Eu(Fe${}_{0.82}$Co${}_{0.18}$)${}_{2}$As${}_{2}$ is unambiguously determined by single-crystal neutron diffraction. A long-range ferromagnetic order the Eu${}^{2+}$ moments along $c$ direction revealed below phase transition temperature ${T}_{C}=17$ K. In addition, antiferromagnetism Fe${}^{2+}$ still survives and tetragonal-to-orthorhombic structural also observed, although temperatures Fe spin-density-wave (SDW) are significantly suppressed to...
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...
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)...
The ground-state magnetic structure of EuNi$_{2}$As$_{2}$ was investigated by single-crystal neutron diffraction. At base temperature, the Eu$^{2+}$ moments are found to form an incommensurate antiferromagnetic spiral-like with a propagation vector $\mathit{k}$ = (0, 0, 0.92). They align ferromagnetically in $\mathit{ab}$ plane moment size 6.75(6) $\mu_{B}$, but rotate spirally 165.6(1){\deg} around $\mathit{c}$ axis from layer layer. order parameter critical region close ordering...
Determination of the magnetic structure and confirmation presence or absence inversion ($\mathcal{P}$) time reversal ($\mathcal{T}$) symmetry is imperative for correctly understanding topological materials. Here high-quality single crystals layered manganese pnictide CaMnSb$_2$ are synthesized using self-flux method. De Haas-van Alphen oscillations indicate a nontrivial Berry phase $\sim$ $\pi$ notably small cyclotron effective mass, supporting Dirac semimetal nature CaMnSb$_2$. Neutron...
${\mathrm{La}}_{0.4}{\mathrm{Na}}_{0.6}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ single crystals have been grown out of an NaAs flux in alumina crucible and characterized by measuring magnetic susceptibility, electrical resistivity, specific heat, as well single-crystal x-ray neutron diffraction. show a structural phase transition from high-temperature tetragonal to low-temperature orthorhombic at ${T}_{s}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}125$ K. This is accompanied anomaly...
Abstract The quantum spin liquid (QSL) states with no long-range magnetic order even down to zero temperature have recently raised intensive research interest. Here we propose that the frustration characteristic of QSL candidates also make them superior magnetocaloric materials exhibit prominent cooling effect, especially near critical points. By simulating highly frustrated kagome and triangular lattice models, reveal a significant magnetothermal pumping effect when combing magnets...
Magnetic double perovskite (DP) compounds provide a fertile playground to explore interesting electronic and magnetic properties. By complementary macroscopic characterizations, neutron powder diffraction measurements, first-principles calculations, we have performed comprehensive studies on the ordering in DP compound ${\mathrm{Sr}}_{2}{\mathrm{NiWO}}_{6}$. It is found by order magnetically collinear type-II antiferromagnetic (AFM) structure tetragonal lattice with $k=(0.5,0,0.5)$ below...
${\mathrm{Co}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$ was recently reported to exhibit remarkable magnetic-field-induced magnetization plateaus and ferroelectricity [R. Chen et al., Phys. Rev. B 98, 184404 (2018)], but its magnetic ground state remains ambiguous. Magnetometry measurements time-of-flight neutron powder diffraction (NPD) have been employed study the structural properties of ${\mathrm{Co}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$, which includes two nonequivalent Co sites. Upon...
We fabricate two-dimensional photonic quasicrystal lattices in iron-doped lithium niobate photorefractive crystal by a single amplitude mask. The experimental setup of this method is very simple and flexible without complicated optical adjustment system. It can be applied almost any laboratories. analyze the plane wave guiding, Brillouin-zone spectroscopy far field diffraction pattern imaging. induced exist stably for long time crystal. This easily extended to generate more complex...
The magnetic structures of the ${\mathrm{Eu}}^{2+}$ and ${\mathrm{Cr}}^{2+}$ moments in nonsuperconducting parent compound ${\mathrm{EuCr}}_{2}{\mathrm{As}}_{2}$ have been determined by using neutron diffraction. While order ferromagnetically with along $\mathbf{c}$ direction at ${T}_{\text{C}}=21.0(1)$ K, ordering temperature is found to be very high 680(40) K magnetization measurements. a $G$-type antiferromagnetic structure direction. According this structure, nearest-neighbor are...
Using the chemical vapour deposition method, we successfully converted smooth ZnO nanorods (NRs) into corrugated NRs by simply increasing reaction time. The surface morphology and crystallographic structure of were investigated. decorated alternant planes at exposed side surfaces while conventional disappeared. No twinning boundaries found in periodically structures, indicating that they type II NRs. Further investigation told us selectively etched. We introduced a hydrothermal method to...
The criticality-enhanced magnetocaloric effect (MCE) near a field-induced quantum critical point (QCP) in the spin systems constitutes very promising and highly tunable alternative to conventional adiabatic demagnetization refrigeration. Strong fluctuations low-$T$ regime can give rise large thermal entropy change thus significant cooling when approaching QCP. In this work, through efficient accurate many-body calculations, we show there exists inverse MCE (iMCE) spin-1 chain materials...
By performing resonant inelastic x-ray scattering (RIXS) measurements at the Ir $\mathit{L_{\mathrm{3}}}$ edge, we have investigated low-energy elementary excitations in a series of double perovskite iridate single crystals, La$_{2}$$\mathit{M}$IrO$_{6}$ ($\mathit{M}$ = Co, Ni, and Zn). Almost dispersionless magnetic $\sim$ 42(6) meV 35(5) been observed crystals containing 3$\mathit{d}$ ions, La$_{2}$CoIrO$_{6}$ La$_{2}$NiIrO$_{6}$, respectively. In contrast, this excitation is absent...