A5005156082- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Corporate Taxation and Avoidance
- Superconductivity in MgB2 and Alloys
- Intellectual Capital and Performance Analysis
- Magnetic and transport properties of perovskites and related materials
- Inorganic Chemistry and Materials
- Magnetic Properties of Alloys
- Superconducting Materials and Applications
- Crystal Structures and Properties
- Advanced Condensed Matter Physics
- Amyloidosis: Diagnosis, Treatment, Outcomes
- Computational Drug Discovery Methods
- Corporate Finance and Governance
- Acoustic Wave Resonator Technologies
- Advanced Thermoelectric Materials and Devices
- Magnetic Properties and Synthesis of Ferrites
- Surface and Thin Film Phenomena
- Geomagnetism and Paleomagnetism Studies
- Microgrid Control and Optimization
- Electromagnetic Fields and Biological Effects
- Boron and Carbon Nanomaterials Research
- Assisted Reproductive Technology and Twin Pregnancy
- Smart Grid Energy Management
Huazhong University of Science and Technology
2024-2025
Chinese Academy of Sciences
2015-2024
University of Chinese Academy of Sciences
2019-2024
Institute of Electrical Engineering
2015-2024
Ningbo Institute of Industrial Technology
2024
Collaborative Innovation Center of Quantum Matter
2020
Institute of Physics
2020
Zhejiang University
2009-2015
(Tl,K)FexSe2 single crystals were first successfully synthesized with the Bridgeman method. The physical properties are characterized by electrical resistivity, magnetic susceptibility and Hall coefficient. We found that (1.30 ⩽ x 1.65) compounds show an antiferromagetic (AFM) insulator behavior, which may be associated Fe-vacancy ordering in crystals. While 1.70 < 1.78 crystals, superconductivity (SC) coexists insulating phase. As Fe content further increases, bulk SC Tc=31 K (and a Tconset...
Single-crystal neutron diffraction studies on superconductors ${A}_{2}{\mathrm{Fe}}_{4}{\mathrm{Se}}_{5}$, where $A=\mathrm{Rb}$, Cs, (Tl, Rb), and K) (${T}_{c}\ensuremath{\sim}30\text{ }\text{ }\mathrm{K}$), uncover the same Fe vacancy ordered crystal structure block antiferromagnetic order as in ${\mathrm{K}}_{2}{\mathrm{Fe}}_{4}{\mathrm{Se}}_{5}$. The order-disorder transition occurs at ${T}_{S}=500--578\text{ }\mathrm{K}$, ${T}_{N}=471--559\text{ }\mathrm{K}$ with an magnetic moment...
High resolution angle-resolved photoemission measurements have been carried out to study the electronic structure and superconducting gap of $({\mathrm{Tl}}_{0.58}{\mathrm{Rb}}_{0.42}){\mathrm{Fe}}_{1.72}{\mathrm{Se}}_{2}$ superconductor with a ${T}_{c}=32\text{ }\text{ }\mathrm{K}$. The Fermi surface topology consists two electronlike sheets around $\ensuremath{\Gamma}$ point which is distinct from that in all other iron-based superconductors reported so far. $M$ shows nearly isotropic...
Single crystals of Tl0.58Rb0.42Fe1.72Se2 are successfully grown with the superconducting transition temperatures Tconset=32K and Tczero=31.4K. The Hall coefficient exhibits a multi-band behavior, which is very similar to that all other Fe-based superconductors. We found susceptibility at normal state decreases decreasing temperature, indicating strong antiferromagnetic (AFM) spin fluctuation state, might be related superconductivity (SC). also determined upper critical fields in ab-plane...
We performed a high-resolution angle-resolved photoemission spectroscopy study of the Tl0.63K0.37Fe1.78Se2 superconductor (Tc=29 K). show existence two electron-like bands at M(π, 0)-point which cross Fermi level similar wave vectors to form nearly circular surface pockets. observe isotropic ∼8.5 meV superconducting gap (2Δ/kBTc∼7) on these surfaces. Our analysis band structure around Brillouin zone centre reveals additional surfaces: very small one and larger with kF comparable surfaces M....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Xianping Zhang, Chao Yao, He Lin, Yao Cai, Zhen Chen, Jianqi Li, Chiheng Dong, Qianjun Dongliang Wang, Yanwei Ma, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe; Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications. Appl. Phys. Lett. 19 May 2014; 104...
The high upper critical field and low anisotropy of iron-based superconductors make them being particularly attractive for high-field applications. However, the current carrying capability needs to be enhanced by overcoming weak-link effect between misaligned grains inside wire tape conductors. Here we demonstrate a transport density (Jc) reaching 1.5x10^5 A/cm^2 (Ic = 437 A) at 4.2 K 10 T in Ba0.6K0.4Fe2As2 (Ba-122) tapes prepared combination conventional powder-in-tube method optimized...
We observed bulk superconductivity in the FeTe${}_{1\ensuremath{-}x}$Se${}_{x}$ crystals with lower Se concentrations after annealed air. A revised magnetism and phase diagram is obtained via resistance magnetic-susceptibility measurements for system. It found that coexists antiferromagnetic order 0.05 $\ensuremath{\le}$ x 0.18. The very similar to case of K-doping or Co-doping BaFe${}_{2}$As${}_{2}$ as well SmFeAsO${}_{1\ensuremath{-}x}$F${}_{x}$ system, perhaps indicating all iron-based...
High-performance Sr0.6K0.4Fe2As2 (Sr-122) tapes have been successfully fabricated using hot pressing (HP) process. The effect of HP temperatures (850-925 C) on the c-axis texture, resistivity, Vickers micro-hardness, microstructure and critical current properties has systematically studied. Taking advantage high degree well grain connectivity large concentration strong-pinning defects, we are able to obtain an excellent Jc 1.2x10^5 A/cm^2 at 4.2 K 10 T for Sr-122 tapes. More importantly,...
Iron-pnictides are hotly studied since 2008 in the superconducting materials research area, due to their special properties and unclear mechanism. Big achievement has been made pnictide during past years. For practical uses, superconductor should be fabricated a long wire form which can used for different devices. In this work, 100 m class 7-core Sr0.6K0.4Fe2As2 (Sr122) tapes have using powder-in-tube technique, is reported first time. Clearly, an average Jc of 1.3x10^4 A/cm^2 at 10 T was...
Abstract Superconducting round wires with isotropic architecture are preferred in fabrications of cables and magnets. To diminish the obstacles to supercurrent, e.g., voids, cracks bubbles, over-pressure heat treatment or hot isostatic pressing is indispensable final annealing process. Here, we fabricated a stainless steel/Cu/Ag sheathed Ba 0.6 K 0.4 Fe 2 As superconducting wire without aid high-pressure sintering. It was found that high-strength outer sheaths groove rolling synergistically...
We have made the first observation of superconductivity in TlNi2Se2 at T(C)=3.7 K, and it appears to involve heavy electrons with an effective mass m*=(14-20)m(b), as inferred from normal-state electronic specific heat upper critical field, H(C2)(T). found that zero-field specific-heat data, C(es)(T) (0.5 K≤T<3.7 K) superconducting state can be fitted a two-gap BCS model, indicating seems multiband superconductor, which is consistent band calculation for isostructural KNi2S2. It also...
We performed a high-resolution angle-resolved photoemission spectroscopy study on superconducting (SC) Tl$_{0.63}$K$_{0.37}$Fe$_{1.78}$Se$_2$ ($T_c=29$ K) in the whole Brillouin zone (BZ). In addition to nearly isotropic $\sim$ 8.2 meV 2-dimensional (2D) SC gap ($2\Delta/k_BT_c\sim7$) quasi-2D electron Fermi surfaces (FSs) located around M$(\pi,0,0)$-A$(\pi,0,\pi)$, we observe $\sim 6.2$ ($2\Delta/k_BT_c\sim5$) Z-centered FS that rules out any d-wave pairing symmetry and rather favors an...
Iron-based superconductors have been considered to be very promising in high-field applications for which multifilamentary wire and tape conductors with high mechanical strength are essential. In this work, 7-,19-, 114-filament Sr0.6K0.4Fe2As2 (Sr-122) superconducting wires tapes silver as matrix iron outer reinforcing sheath were produced by the ex situ powder-in-tube method. The mass densities of Sr-122 phase 7- 19-filament investigated microhardness characterization, revealed a positive...
Iron-based superconductors have become a promising candidate for high-field applications due to their high transition temperature, ultra-high upper critical field, and low anisotropy. For practical applications, it is important improve the transport Jc lower cost of superconductors. In this paper, with groove rolling hot isostatic pressing (HIP) process, Cu/Ag composite sheathed (Ba, K)Fe2As2 powder-in-tube round wires was increased 4.7 × 104 A cm−2 at 10 T 4.2 K. The utilization HIP process...
The fabrication of iron-based superconductors with high transport critical current density (J c) and low cost is a crucial determinant whether they can be used for practical applications. In this paper, Cu/Ag composite sheathed Sr0.6K0.4Fe2As2 (Sr122) tapes Ba0.6K0.4Fe2As2 (Ba122) round wires were fabricated via an ex situ powder-in-tube method heat-treated by the hot pressing isostatic process respectively. order to thoroughly reveal application potential '122' iron pnictide...