A5004528935- Iron-based superconductors research
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Corporate Taxation and Avoidance
- Inorganic Chemistry and Materials
- Topological Materials and Phenomena
- Intellectual Capital and Performance Analysis
- Electronic and Structural Properties of Oxides
- High Entropy Alloys Studies
- MXene and MAX Phase Materials
- Magnetic properties of thin films
- 2D Materials and Applications
- High-Temperature Coating Behaviors
- Intermetallics and Advanced Alloy Properties
- Theoretical and Computational Physics
- Inorganic Fluorides and Related Compounds
- Ferroelectric and Piezoelectric Materials
- Crystallization and Solubility Studies
- High-pressure geophysics and materials
- Dielectric properties of ceramics
- Multiferroics and related materials
- Advanced Materials Characterization Techniques
Zhejiang University
2016-2025
Collaborative Innovation Center of Advanced Microstructures
2016-2025
Nanjing University
2015-2025
ASM International (Finland)
2025
State Key Laboratory of Silicon Materials
2015-2024
Zhejiang University of Technology
2021-2024
Taiyuan University of Science and Technology
2023
Hangzhou Xixi hospital
2021
Shanghai University
2003-2021
Louisiana State University
2021
We report a new strategy to induce superconductivity in iron-based oxyarsenide. Instead of F- substitution for O2-, we employed Th4+ doping GdFeAsO with the consideration "lattice match" between Gd2O2 layers and Fe2As2 ones. As result, Tconset as high 56 K was realized Gd0.8Th0.2FeAsO polycrystalline sample. This Tc value is among highest ever discovered oxypnictides.
The discovery of high-temperature superconductivity in iron pnictides raised the possibility an unconventional superconducting mechanism multiband materials. observation Fermi-surface (FS)-dependent nodeless gaps suggested that inter-FS interactions may play a crucial role pairing. In optimally hole-doped Ba(0.6)K(0.4)Fe(2)As(2), pairing strength is enhanced simultaneously (2Delta/T(c) approximately 7) on nearly nested FS pockets, i.e., inner hole-like (alpha) and 2 hybridized electron-like...
We report bulk superconductivity induced by an isovalent doping of phosphorus in BaFe2(As1−xPx)2. The P-for-As substitution results shrinkage the lattice, especially for FeAs block layers. resistivity anomaly associated with spin-density-wave (SDW) transition undoped compound is gradually suppressed P doping. Superconductivity a maximum Tc 30 K emerges at x = 0.32, coinciding magnetic quantum critical point (QCP) which shown disappearance SDW order and linear temperature-dependent normal...
A series of 122 phase BaFe2−xNixAs2 (x=0, 0.055, 0.096, 0.18 and 0.23) single crystals was grown by the self-flux method a dome-like Ni doping dependence superconducting transition temperature discovered. The Tcon reaches maximum 20.5 K at x=0.096, it drops to below 4 as x⩾0.23. negative thermopower in normal state indicates that electron-like charge carrier indeed dominates this system. This Ni-doped system provides another example superconductivity induced electron phase.
We have studied EuFe2(As0.7P0.3)(2) by the measurements of x-ray diffraction, electrical resistivity, thermopower, magnetic susceptibility, magnetoresistance, and specific heat. Partial substitution As with P results in shrinkage lattice, which generates chemical pressure to system. It is found that undergoes a superconducting transition at 26 K, followed ferromagnetic ordering Eu2+ moments 20 K. This finding first observation superconductivity stabilized internal pressure, supplies rare...
Ternary iron arsenide ${\text{EuFe}}_{2}{\text{As}}_{2}$ with ${\text{ThCr}}_{2}{\text{Si}}_{2}$-type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall, and specific-heat measurements. The compound undergoes two phase transitions at about 200 20 K, respectively. former was found to be accompanied a slight drop in susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), rapid decrease large jump sharp peak specific heat decreasing...
The superconducting phase diagrams have been established by the measurements of electrical resistivity, magnetic susceptibility, and thermopower in cobalt-doped $L\text{FeAsO}$ ($L=\text{La}$ Sm) systems. It is shown that antiferromagnetic spin-density-wave order parent compounds rapidly suppressed Co doping, superconductivity emerges at $x=0.025$ 0.05 ${\text{LaFe}}_{1\ensuremath{-}x}{\text{Co}}_{x}\text{AsO}$ ${\text{SmFe}}_{1\ensuremath{-}x}{\text{Co}}_{x}\text{AsO}$, respectively....
We use inelastic neutron scattering to study magnetic excitations of the FeAs-based superconductor ${\mathrm{BaFe}}_{1.9}{\mathrm{Ni}}_{0.1}{\mathrm{As}}_{2}$ above and below its ${T}_{c}$ ($=20\text{ }\text{ }\mathrm{K}$). In addition gradually open a spin gap at in-plane antiferromagnetic ordering wave vector (1, 0, 0), effect superconductivity is form three-dimensional resonance with clear dispersion along $c$ axis. The intensity develops like superconducting order parameter, mode occurs...
Through a combination of x-ray diffraction, electrical transport, magnetic susceptibility, and heat-capacity measurements, we report the effect La doping on Sr in newly discovered SrFBiS${}_{2}$ system. Superconducting transition with critical temperature T${}_{c}$ 2.8 K, developed from semiconducting-like normal state, was found Sr${}_{0.5}$La${}_{0.5}$FBiS${}_{2}$. A strong diamagnetic signal clear specific-heat anomaly associated this were observed, confirming bulk superconductivity. The...
Following the discovery of superconductivity in quasi-one-dimensional K$_2$Cr$_3$As$_3$ containing [(Cr$_3$As$_3$)$^{2-}$]$_{\infty}$ chains [J. K. Bao et al., arXiv: 1412.0067 (2014)], we succeeded synthesizing an analogous compound, Rb$_2$Cr$_3$As$_3$, which also crystallizes a hexagonal lattice. The replacement K by Rb results expansion $a$ axis 3\%, indicating weaker interchain coupling Rb$_2$Cr$_3$As$_3$. Bulk emerges at 4.8 K, above normal-state resistivity shows linear temperature...
Infrared reflectivity measurements on 122 iron-pnictides reveal the existence of two electronic subsystems. The one gapped due to spin-density-wave transition in parent materials, such as EuFe$_2$As$_{2}$, is responsible for superconductivity doped compounds, like Ba(Fe$_{0.92}$Co$_{0.08})_2$As$_{2}$ and Ba(Fe$_{0.95}$Ni$_{0.05})_2$As$_{2}$. Analyzing dc resistivity scattering rate this contribution, a hidden $T^2$ dependence found, indicating that evolves out Fermi-liquid state. second...
Superconductivity (SC) and charge-density wave (CDW) are two contrasting yet relevant collective electronic states, which have received sustained interest for decades. Here, we report that, in a layered europium bismuth sulfofluoride, ${\mathrm{EuBiS}}_{2}\mathrm{F}$, CDW-like transition occurs at 280 K, below SC emerges 0.3 without any extrinsic doping. The Eu ions were found to exhibit an anomalously temperature-independent mixed valence of about +2.2, associated with the formation...
We report the synthesis, crystal structure, and physical properties of a quinary iron arsenide fluoride, KCa2Fe4As4F2. The new compound crystallizes in body-centered tetragonal lattice (space group I4/mmm, = 3.8684(2) Å, c 31.007(1) Z 2) that contains double Fe2As2 conducting layers separated by insulating Ca2F2 layers. Our measurements electrical resistivity, direct-current magnetic susceptibility, heat capacity demonstrate bulk superconductivity at 33 K
Iron-chalcogenide superconductors have emerged as a promising Majorana platform for topological quantum computation. By combining band and superconductivity in single material, they provide significant advantage to realize isolated zero modes. However, iron-chalcogenide superconductors, especially Fe(Te,Se), suffer from strong inhomogeneity which may hamper their practical application. In addition, some iron-pnictide been demonstrated surface states, yet no mode has observed inside vortices,...
The second class of high-temperature superconductors (HTSCs), iron-based pnictides and chalcogenides, necessarily contain Fe$_2$$X_2$ ("$X$" refers to a pnictogen or chalcogen element) layers, just like the first HTSCs which possess essential CuO$_2$ sheets. So far, dozens HTSCs, classified into nine groups, have been discovered. In this article, crystal-chemistry aspects known are reviewed summarized by employing "hard soft acids bases (HSAB)" concept. Based on these understandings, we...
The recent discovery of superconductivity in the quasi-one-dimensional compound ${\mathrm{K}}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{3}$, which consists double-walled tubes ${[{({\mathrm{Cr}}_{3}{\mathrm{As}}_{3})}^{2\ensuremath{-}}]}^{\ensuremath{\infty}}$ that run along $c$ axis, has attracted immediate attention as a potential system for studying superconductors with reduced dimensionality. Here we report clear experimental evidence unconventional nature superconducting order parameter by...
Superconductivity (SC) and local-moment ferromagnetism (FM) are mutually antagonistic collective phenomena, their genuine coexistence is rarely seen in nature. Although recent years have witnessed the possible of SC Eu-spin FM some doped EuFe${}_{2}$As${}_{2}$ systems, evidence simultaneous bulk obvious still absent. Here, authors report a robust iron pnictide RbEuFe${}_{4}$As${}_{4}$. The newly synthesized material virtually an intergrowth RbFe${}_{2}$As${}_{2}$ EuFe${}_{2}$As${}_{2}$,...
We report ^{75}As NMR measurements on the new quasi-one-dimensional superconductor K_{2}Cr_{3}As_{3} (T_{c}∼6.1 K) [J. K. Bao et al., Phys. Rev. X 5, 011013 (2015)]. found evidence for strong enhancement of Cr spin fluctuations above T_{c} in [Cr_{3}As_{3}]_{∞} double-walled subnanotubes based nuclear spin-lattice relaxation rate 1/T_{1}. The power-law temperature dependence, 1/T_{1}T∼T^{-γ} (γ∼0.25), is consistent with Tomonaga-Luttinger liquid. Moreover, absence Hebel-Slichter coherence...
We studied the magnetic properties of YCu$_3$(OH)$_6$Br$_2$[Br$_{1-x}$(OH)$_{x}$] ($x$ = 0.33), where Cu$^{2+}$ ions form two-dimensional kagome layers. There is no order down to 50 mK while Curie-Weiss temperature on -100 K. At zero field, low-temperature specific heat shows a $T^2$ dependence. Above 2 T, linear dependence term in emerges, and value $\gamma C/T$ increases linearly with field. Furthermore, susceptibility tends constant at $T 0$. Our results suggest that ground state...
The spin dynamics and electronic orders of the kagome system at different filling levels stand as an intriguing subject in condensed matter physics. By first-principles calculations random phase approximation analyses, we investigate fluctuations superconducting instabilities CsCr3Sb5 under high pressure. At level slightly below flat bands, our reveal strong antiferromagnetic CsCr3Sb5, together with a leading s±-wave competing (dxy, $${d}_{{x}^{2}-{y}^{2}}$$ )-wave order. Unlike general...