A5074141197- Iron-based superconductors research
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Graphene research and applications
- Crystallization and Solubility Studies
- Superconductivity in MgB2 and Alloys
- Inorganic Chemistry and Materials
- Perovskite Materials and Applications
- X-ray Diffraction in Crystallography
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Boron and Carbon Nanomaterials Research
- Luminescence Properties of Advanced Materials
- Quantum and electron transport phenomena
- Surface and Thin Film Phenomena
- Quantum many-body systems
- Advanced Photocatalysis Techniques
- Nanocluster Synthesis and Applications
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
- Multiferroics and related materials
Leibniz Institute for Solid State and Materials Research
2023-2025
State Key Laboratory of Surface Physics
2018-2023
Fudan University
2018-2023
Max Planck Institute for Chemical Physics of Solids
2023
Science and Technology on Surface Physics and Chemistry Laboratory
2019
Zhejiang Normal University
2015-2017
Jinhua Academy of Agricultural Sciences
2015
Rutgers, The State University of New Jersey
1994
Abstract The noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneous space-inversion and time-reversal symmetry breaking provides a unique platform for exploring novel topological states. Here, by employing multiple experimental techniques, we demonstrate that ferromagnetism pressure can serve as efficient parameters to tune the positions of nodes in CeAlSi. At ambient pressure, magnetism-facilitated anomalous Hall/Nernst effect (AHE/ANE) is uncovered. Angle-resolved...
A general feature of unconventional superconductors is the existence a superconducting dome in phase diagram as function carrier concentration. For simplest iron-based superconductor FeSe (with transition temperature Tc ~ 8 K), its can be greatly enhanced by doping electrons via many routes, even up to 65 K monolayer FeSe/SiTiO3. However, clear with concentration for FeSe-derived still lacking. Here, we report observation series discrete phases thin flakes continuously tuning through...
Two-dimensional (2D) van der Waals heterostructures (VDWHs) containing a charge-density wave (CDW) and superconductivity (SC) have revealed rich tunability in their properties, which provide new route for optimizing novel exotic states. The interaction between SC CDW is critical to its properties; however, understanding this within VDWHs very limited. A comprehensive situ study theoretical calculation on bulk 4Hb-TaSe2 consisting of alternately stacking 1T-TaSe2 1H-TaSe2 monolayers are...
The search of quantum spin liquid (QSL), an exotic magnetic state with strongly fluctuating and highly entangled spins down to zero temperature, is a main theme in current condensed matter physics. However, there no smoking gun evidence for deconfined spinons any QSL candidate so far. disorders competing exchange interactions may prevent the formation ideal on frustrated lattices. Here we report comprehensive systematic measurements susceptibility, ultralow-temperature specific heat, muon...
The noncentrosymmetric $R\mathrm{Al}\mathit{Pn}$ ($R=\mathrm{rare}\phantom{\rule{0.16em}{0ex}}\mathrm{earth}, Pn=\mathrm{Si}$, Ge) family, predicted to host nonmagnetic and magnetic Weyl states, provides an excellent platform for investigating the relation between magnetism physics. By using high-field magnetotransport measurements first principles calculations, we have unveiled herein both type-I type-II states in LaAlSi. a careful comparison experimental results theoretical nontrivial...
Pulsed laser deposition was used to grow c-axis aligned films of La2−xSrxCuO4−δ, with Sr content, x, in the range 0.03 0.2, on substrates prepared from single-crystalline SrLaAlO4, a lattice mismatch 0.5%. The thickness dependence Tc0, temperature at which resistance falls zero, is much reduced compared that deposited SrTiO3, where 3.4%. maximum Tc0 achieved x=0.15 for both types substrates. While related strain resulting mismatch, value determined by oxygen concentration.
Abstract Topological nodal-line semimetals (TNLSMs) are materials whose conduction and valence bands cross each other, meeting a topologically protected closed loop rather than discrete points in the Brillouin zone (BZ). The anticipated properties for TNLSMs, include drumhead-like nearly flat surface states, unique Landau energy levels, special collective modes, long-range Coulomb interactions, or possibility of realizing high-temperature superconductivity. Recently, SrAs 3 has been...
Abstract The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead a variety novel physics. We systematically studied semimetal EuAs 3 , demonstrating magnetism-induced transition from nodal-line paramagnetic or spin-polarized state massive Dirac metal antiferromagnetic ground at low temperature. has been verified by electrical transport measurements. An unsaturated extremely large magnetoresistance ~2 × 10...
Recently, a new family of iron-based superconductors called 12442 was discovered and the muon spin relaxation ($\mu$SR) measurements on KCa$_2$Fe$_4$As$_4$F$_2$ CsCa$_2$Fe$_4$As$_4$F$_2$ polycrystals, two members family, indicated that both have nodal superconducting gap structure with $s+d$ pairing symmetry. Here we report ultralow-temperature thermal conductivity single crystals ($T_c$ = 29.3 K). A negligible residual linear term $\kappa_0/T$ in zero field dependence suggest multiple...
Centrosymmetric compounds which host three-dimensional topological spin structures comprise a distinct subclass of materials in multiple-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi mathvariant="bold">q</a:mi></a:mrow></a:math> magnetic order is stabilized by anisotropy and bond frustration contrast to the more common path antisymmetric exchange interactions. Here we investigate static dynamic properties cubic perovskite <d:math...
While the pure elements tend to exhibit Type-I rather than Type-II superconductivity, nearly all compound superconductors are Type-II, with only a few known exceptions. We report single crystal growth and physical characterization of rhenium aluminide Al$_6$Re, which we conclude is superconductor based on magnetization, ac-susceptibility, specific-heat measurements. This detection despite strong similarity Al$_6$Re family W Mo aluminides that do not superconduct, suggests these an ideal...
Recently, a new transition-metal dichalcogenide (TMD) material $2M$-phase ${\mathrm{WS}}_{2}$ was synthesized. The $2M\text{\ensuremath{-}}{\mathrm{WS}}_{2}$ not only exhibits superconductivity, with the highest ${T}_{\text{c}}$ being 8.8 K at ambient pressure among TMDs, but also hosts topological surface state. Here we report low-temperature thermal conductivity measurements on single crystals to investigate its superconducting gap structure. A negligible residual linear term...
We grew the single crystals of SnAs-based van der Waals (vdW)-type superconductor NaSn2As2 and systematically measured its resistivity, specific heat, ultralow-temperature thermal conductivity. The superconducting transition temperature our crystal is 0.3 K higher than that previously reported. A weak but intrinsic anomaly situated at 193 observed in both resistivity which likely arises from a charge-density-wave (CDW) instability. Ultralow-temperature conductivity measurements reveal fully...
A metastable vanadium oxytelluride V2Te2O is prepared via a topochemical deintercalation of interlayer Rb+ cations in Rb1−δV2Te2O. The new ternary mixed-anion compound crystallizes body-centered tetragonal lattice with = 3.9282(1) Å and c 13.277(5) Å, containing V2O square nets that are sandwiched by Te-atomic sheets. charge-neutral [V2OTe2] block layers stack along the axis van der Waals forces, which shows metallic behavior dominant T2 dependence for resistivity at low temperatures....
Recently, a novel material with bilayer kagome lattice ${\mathrm{Ca}}_{10}{\mathrm{Cr}}_{7}{\mathrm{O}}_{28}$ was proposed to be gapless quantum spin liquid, due the lack of long-range magnetic order and observation broad diffuse excitations. Here, we present ultralow-temperature thermal conductivity measurements on single crystals detect its low-lying At finite temperatures, increasing fields, exhibits clear dip around 6 T, which may correspond crossover in ground state. zero-temperature...
Abstract Spin liquids are exotic states with no spontaneous symmetry breaking down to zero-temperature because of the highly entangled and fluctuating spins in frustrated systems. Exotic excitations like magnetic monopoles, visons, photons may emerge from quantum spin ice states, a special kind pyrochlore lattices. These materials usually insulators, an exception iridate Pr 2 Ir O 7 , which was proposed as metallic liquid located at zero-field critical point. Here we report...
Magnetic metals with geometric frustration offer a fertile ground for studying novel states of matter strong quantum fluctuations and unique electromagnetic responses from conduction electrons coupled to spin textures. Recently, TbTi$_3$Bi$_4$ has emerged as such an intriguing platform it behaves quasi-one-dimension (quasi-1D) Ising magnet antiferromagnetic orderings at 20.4 K 3 K, respectively. fields along the Tb zigzag-chain direction reveal plateaus 1/3 2/3 saturated magnetization, At...
Kagome materials with magnetic frustration in two-dimensional networks are known for their exotic properties, such as the anomalous Hall effect (AHE) non-collinear spin textures. However, effects of one-dimensional (1D) chains within these less understood. Here, we report a distinctive AHE bilayer-distorted kagome material GdTi$_3$Bi$_4$, featuring 1D Gd zigzag chains, one-third magnetization plateau, and two successive metamagnetic transitions. At transitions, resistivity shows abrupt jumps...
Significant manifestation of interplay superconductivity and charge density wave, spin wave or magnetism is dome-like variation in superconducting critical temperature (Tc) for cuprate, iron-based heavy Fermion superconductors. Overall behavior that the ordered gradually suppressed Tc enhanced under external control parameters. Many phenomena like pesudogap, quantum point strange metal emerge different doping range. Exploring dome-shaped new superconductors importance to detect emergent...
Theoretical studies predicted possible superconductivity in electron-doped chromium pnictides isostructural to their iron counterparts. Here, we report the synthesis and characterization of a ZrCuSiAs-type Cr-based compound ThCrAsN, as well its oxygen-doped variants. All samples ${\mathrm{ThCrAsN}}_{1\ensuremath{-}x}{\mathrm{O}}_{x}$ show metallic conduction, but no is observed above 30 mK even though oxygen substitution reaches 75%. The magnetic structure ThCrAsN determined be G-type...
In this work, we report the discovery of a new Ni-based quasi-one-dimensional selenide: Cs0.9Ni3.1Se3. This compound adopts TlFe3Te3-type structure with space group P63/ m, which consists infinite [Ni3Se3] chains face-sharing Ni6 octahedra along c direction. The lattice parameters are calculated as = 9.26301(4) Å and 4.34272(2) Å, Ni-Ni distance in ab plane 2.582(3) suggesting formation metallic bond compound. Interestingly, it has been found that Cs0.9Ni3.1Se3 is nonstoichiometric,...
Metal cluster compounds have garnered renewed interest in the search for novel superconductors and topological semimetals owing to structural instabilities of metal-cluster geometries broken symmetries. Here we synthesized needle-like crystals V-cluster-based quasi-one-dimensional (Q1D) materials AV3Q3Oδ (A = K, Rb, Cs, Q Se, Te) which can also be viewed as being composed parallel nanowires. We examine how changes their average local structure control electronic properties. All crystallize...