A5013546289- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Adsorption and Cooling Systems
- Magnetic and transport properties of perovskites and related materials
- Carbon Dioxide Capture Technologies
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Solar-Powered Water Purification Methods
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Rare-earth and actinide compounds
- Material Science and Thermodynamics
- Wind and Air Flow Studies
- Smart Parking Systems Research
- Refrigeration and Air Conditioning Technologies
- Spacecraft and Cryogenic Technologies
- Advanced Manufacturing and Logistics Optimization
- Advanced Chemical Physics Studies
- X-ray Diffraction in Crystallography
- High-pressure geophysics and materials
- Phase Change Materials Research
- Advanced Thermodynamics and Statistical Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Phase Equilibria and Thermodynamics
- ZnO doping and properties
Nanjing University
2019-2024
University of Chinese Academy of Sciences
2022-2024
Technical Institute of Physics and Chemistry
2022-2024
Chinese Academy of Sciences
2023-2024
Collaborative Innovation Center of Advanced Microstructures
2020-2024
The recently discovered kagome metals $A$V${}_{3}$Sb${}_{5}$ ($A$=K, Rb or Cs) have generated great interest as they exhibit an unconventional charge density wave (CDW), superconductivity, and nontrivial band topology. Here, the authors combine infrared spectroscopy first-principles calculations to shed light on origin of CDW. They find that below CDW transition optical conductivity component associated with saddle points is significantly suppressed, while arising from light-electron Dirac...
The discovery of superconductivity with a critical temperature about 80 K in La3Ni2O7 single crystals under pressure has received enormous attention. is not superconducting ambient but exhibits transition at T ∗ ≃ 115 K. Understanding the electronic correlations and charge dynamics an important step towards origin other instabilities. Here, our optical study shows that features strong which significantly reduce electron's kinetic energy place this system proximity Mott phase. low-frequency...
The discovery of superconductivity with a critical temperature about 80~K in La$_{3}$Ni$_{2}$O$_{7}$ single crystals under pressure has received enormous attention. is not superconducting ambient but exhibits transition at $T^{\ast} \simeq 115$~K. Understanding the electronic correlations and charge dynamics an important step towards origin other instabilities. Here, our optical study shows that features strong which significantly reduce electron's kinetic energy place this system proximity...
The transport and optical properties of Nb-doped $\mathrm{Cs}({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{x}$)${}_{3}{\mathrm{Sb}}_{5}$ with $x=0.03$ 0.07 have been investigated compared those undoped ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$. Upon Nb doping, the charge density wave (CDW) transition temperature ${T}_{\text{CDW}}$ is suppressed, superconducting ${T}_{c}$ rises. residual resistivity ratio decreases suggesting an increase disorder. For all compounds, conductivity in pristine...
The kagome metals $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, Cs) have attracted enormous interest as they exhibit intertwined charge-density wave (CDW) and superconductivity. alkali-metal dependence of these characteristics contains pivotal information about the CDW its interplay with Here, we report optical studies across whole family. With increasing atom radius from K to Cs, gap increases monotonically, whereas $T_{\text{CDW}}$ first rises then drops, at variance conventional CDW. While Fermi...
We present an investigation into the optical properties of ${\mathrm{Nd}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{8}$ at different temperatures from 300 down to 5 K over a broad frequency range. The conductivity is decomposed infrared-active phonons, far-infrared band $\ensuremath{\alpha}$, mid-infrared $\ensuremath{\beta}$, and high-energy absorption edge. By comparing measured first-principles calculations response other nickelates, we find that features evident charge-stripe fluctuations....
The optical properties of $\mathrm{K}{\mathrm{Ca}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ (K12442, ${T}_{c}=33.5$ K) and $\mathrm{K}{\mathrm{Ca}}_{2}{({\mathrm{Fe}}_{0.95}{\mathrm{Ni}}_{0.05})}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ (Ni-K12442, ${T}_{c}=29$ have been examined at a large number temperatures. For both samples, nodeless superconducting gap is clearly observed in the conductivity 5 K. $\mathrm{\ensuremath{\Delta}}\ensuremath{\simeq}8.7$ meV...
We report on optical studies of the Ruddlesden-Popper nickelates La$_{n+1}$Ni$_{n}$O$_{3n+1}$ with $n = 2$ (La$_{3}$Ni$_{2}$O$_{7}$), 3$ (La$_{4}$Ni$_{3}$O$_{10}$) and \infty$ (LaNiO$_{3}$). As number NiO$_{6}$ octahedra layers $n$ grows, ratio kinetic energy determined from experimental conductivity that band theory $K_{\text{exp}}/K_{\text{band}}$ increases, suggesting a reduction electronic correlations. While strong correlations in bilayer La$_{3}$Ni$_{2}$O$_{7}$ place it verge Mott...
Abstract CO 2 liquefaction is significant to ensure transport safety and improve efficiency. Aiming at the temperature pressure required for ship transport, this paper examines four schemes including compression refrigeration system, Linde Hampson precooled system Claude system. The thermodynamic exergetic ananlysis models are established primarily total power consumption, efficiency as well exergy of systems calculated compared. shows best performance with three indicators 391.74 kJ/kg,...
Carbon dioxide energy storage is a new technology, which has excellent thermodynamic, economic and environmental performance. In this paper, thermo-electric system based on water storage, including two carbon cycles of heat pump charging engine discharging, established by Aspen Hysys software. And the characteristics combined cooling, heating power technology further investigated. A multi-objective optimization model for maximum efficiency benefit considering user demand built. Taking...
The kagome metals $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, Cs) have attracted enormous interest as they exhibit intertwined charge-density wave (CDW) and superconductivity. alkali-metal dependence of these characteristics contains pivotal information about the CDW its interplay with Here, we report optical studies across whole family. With increasing atom radius from K to Cs, gap increases monotonically, whereas $T_{\text{CDW}}$ first rises then drops, at variance conventional CDW. While Fermi...
Under the background of rapid development energy storage technology, a transcritical carbon dioxide (TC-CES) system based on liquid and supercritical is proposed. The has advantages high density, no geographical restrictions, promoting emission reduction. To explore mechanism working parameters TC-CES thermodynamic performance, mathematical model was established. Using Aspen plus MATLAB software to simulate process, characteristics are analyzed, influence pressure release efficiency deeply...