A5078781689- Iron-based superconductors research
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Jiangnan University
2022-2025
Anhui Normal University
2025
Beijing Research Institute of Uranium Geology
2024-2025
Rikkyo University
2023-2025
Nano Energy (South Africa)
2025
Fudan University Shanghai Cancer Center
2025
Southwest Minzu University
2023-2024
Jilin University
2024
Hong Kong Polytechnic University
2024
Northeastern University
2023-2024
A deeper look into iron selenide In the past 10 years, iron-based superconductors have created more puzzles than they helped resolve. Some of most fundamental outstanding questions are how strong interactions and what electron pairing mechanism is. Now two groups made contributions toward resolving these in intriguing compound (FeSe) (see Perspective by Lee). Gerber et al. used photoemission spectroscopy coupled with x-ray diffraction to find that FeSe has a very sizable electron-phonon...
While the parent compounds of cuprate high temperature superconductors (high-Tc's) are Mott insulators, iron-pnictide high-Tc's in vicinity a metallic spin density wave (SDW) state, which highlights difference between these two families. However, insulating were identified for newly discovered KxFe2-ySe2. This raises an intriguing question as to whether iron-based could be viewed doped insulators like cuprates. Here we report angle-resolved photoemission spectroscopy (ARPES) evidence and one...
The superconductivity discovered in iron pnictides is intimately related to a nematic ground state, where the ${C}_{4}$ rotational symmetry broken via structural and magnetic transitions. We here study nematicity NaFeAs with polarization-dependent angle-resolved photoemission spectroscopy. A uniaxial pressure was applied on sample overcome twinning effect low temperature ${C}_{2}$-symmetric state obtain much simpler electronic structure than that of twinned sample. found undergoes an...
Experiments reveal changes in the electronic state of iron-based superconductor FeSe during emergence nematicity, a fourfold rotational symmetry breaking that arises close to onset superconductivity.
Abstract Despite the dominance of lead-based piezoelectric materials with ultrahigh electric-field-induced strain in actuating applications, seeking eco-friendly substitutes an equivalent performance remains urgent demand. Here, a strategy regulating irreversible non-180° domain via phase engineering is introduced to optimize available (the difference between maximum and remnant unipolar curve) lead-free potassium–sodium niobate-based ceramics. In situ synchrotron X-ray diffraction Rayleigh...
The unconventional superconductivity in the newly discovered iron-based superconductors is intimately related to its multiband/multiorbital nature. Here we report comprehensive orbital characters of low-energy three-dimensional electronic structure BaFe${}_{1.85}$Co${}_{0.15}$As${}_{2}$ by studying polarization and photon-energy dependence angle-resolved photoemission data. While distributions ${d}_{\mathit{xz}}$, ${d}_{\mathit{yz}}$, ${d}_{3{z}^{2}\ensuremath{-}{r}^{2}}$ orbitals agree with...
The diversities in crystal structures and ways of doping result extremely diversified phase diagrams for iron-based superconductors. With angle-resolved photoemission spectroscopy, we have systematically studied the effects chemical substitution on electronic structure various series Beyond Fermi-surface alteration that has been reported most often past, found two more extraordinary doping: (1) site band dependencies quasiparticle scattering and, importantly, (2) ubiquitous significant...
Although a nodeless superconducting gap has been observed on the large Fermi pockets around zone corner in K${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$, whether its pairing symmetry is $s$ wave or $d$ still under intense debate. Here we report an isotropic distribution small electron pocket $Z$ point which favors $s$-wave symmetry.
Herein, a novel strategy has been developed for the preparation of high-performance conductive elastomers featuring long functional polymer cross-linkers. The macromolecular cross-linkers containing multi boronic ester bonds in backbone were designed via thiol/acrylate reactions between poly(ethylene glycol) diacrylate (PEGDA) and dithiol-containing (BDB). obtained PEG–BDB was copolymerized with n-butyl acrylate (n-BA) to provide PBA/PEG–BDB elastomers. resultant exhibit combined desirable...
Retinal ischemia-reperfusion (RIR) injury caused by high intraocular pressure (IOP) is an important risk factor contributing to retinal ganglion cell (RGC) death, eventually causing blindness. A key progressive pathological process in the development of RIR death RGCs. However, detailed mechanisms underlying RGC have not yet been clearly elucidated, and effective treatments are lacking. Ferroptosis a recently defined form programmed that closely related organ injury. Melatonin (MT) promising...
The electronic structure of a new charge-density-wave/ superconductor system, 1T-CuxTiSe2, has been studied by photoemission spectroscopy. A correlated semiconductor band is revealed for the undoped case. With Cu doping, charge density wave suppressed raising chemical potential, while superconductivity enhanced enhancement states. Moreover, strong scattering at high doping might be responsible suppression in that regime.
The three-dimensional band structure and superconducting gap of Ba0.6K0.4Fe2As2 are studied with angle-resolved photoemission spectroscopy. In contrast previous results, we have identified three holelike Fermi surface sheets near the zone center sizable out-of-plane or kz dispersion. on certain shows significant dependence. Moreover, sizes different at same momentum for two bands spatial symmetries (one odd, one even). Our results further reveal orbital-dependent in iron pnictides, which...
The electronic structure of NaFeAs is studied with angle-resolved photoemission spectroscopy on high quality single crystals. Large portions the band start to shift around structural transition temperature and smoothly evolve as lowers through spin density wave transition. Moreover, folding due magnetic order emerges slightly above Our observation provides direct evidence that transitions share same origin could both be driven by reconstruction in Fe-based superconductors instead Fermi...
An excellent short-wave UV nonlinear optical material, Y<sub>8</sub>O(OH)<sub>15</sub>(CO<sub>3</sub>)<sub>3</sub>Cl, featured an infrequent three-dimensional inorganic cationic framework.
The nature of the spin-density wave (SDW) and its relation with superconductivity are crucial issues in newly discovered iron-pnictide superconductors. Particularly, it is unclear whether superconducting phase SDW truly exclusive from each other. We here report splittings band structures Sr1-xKxFe2As2 (x=0, 0.1, 0.18), their unusual doping dependence. Our data on single crystalline samples prove that could coexist iron pnictides.
${\mathrm{NbSe}}_{2}$ is a prototypical charge-density-wave (CDW) material, whose mechanism remains mysterious so far. With angle resolved photoemission spectroscopy, we recovered the long-lost nesting condition over large broken-honeycomb region in Brillouin zone, which consists of six saddle band point regions with high density states (DOS), and away from Fermi surfaces negligible DOS at energy. We show that major contributions to CDW formation come these barely occupied rather than...
New experimental findings about the electronic structure of NaFe${}_{0.9825}$Co${}_{0.0175}$As explain fundamentally intriguing and important puzzle why magnetic order superconductivity can coexist in such iron-based superconductors reveal an intimate tie between coexistence electron pairing underlying superconductivity.
BaFe${}_{2}$(As${}_{1\ensuremath{-}x}$P${}_{x}$)${}_{2}$ is a unique iron-based superconductor, where the superconductivity induced by isovalent substitution of phosphorus (P) for arsenic (As). Unlike other iron pnictides, superconducting gap in has been suggested to contain nodal lines various experiments. The exact nature doping and are key open issues building comprehensive picture superconductors. With angle-resolved photoemission spectroscopy, we found that P alters electronic structure...