Related Experiment Video
Updated: Apr 9, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Configurational Entropy Induced Superconductive Phase Transition Temperature Dome in La1.8Sr0.15KxNa0.05-xCuO4-δ
Deyang Xu1, Yuxiang Feng2, Junjun Cai2
1MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin, People's Republic of China.
None:
The data for the temperature-dependent resistance and magnetic susceptibility of La1.8Sr0.15KxNa0.05-xCuO4-δ indicate that a superconductive phase transition temperature dome (Tc-dome) forms with the isovalent doping of Na+ by K+. This is something unusual because Tc-dome is typically formed by the aliovalent doping in a superconductor, where the charge concentration increases from under-doped, to optimal-doped, and further to over-doped state with Tc first increasing and then decreasing. X-ray diffraction data show that La1.8Sr0.15KxNa0.05-xCuO4-δ crystallizes in I4/mmm space group with a monotonic increase of the lattice parameters a and c when x increases, which excludes that the appearance of the Tc-dome is due to the appearance of impurity, the phase transition, or the nonmonotonic change of lattice parameters. The first-principles calculations suggest that the change of configurational entropy can induce the change of the ratio Cu2+:Cu3+ along with the change of oxygen vacancies in La1.8Sr0.15KxNa0.05-xCuO4-δ, which may cause the change of Tc. Therefore, it seems reasonable to imply that the dome of the change of configurational entropy in La1.8Sr0.15KxNa0.05-xCuO4-δ may induce its Tc-dome.
More Related Videos
04:51Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
Related Concept Videos
Superconductor
Phase Transitions: Sublimation and Deposition
Phase Diagrams of Ternary Systems
Phase Diagram
Phase Diagram
Phase Transitions