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Scientists Discover Quantum Phase Transition of Pressurized Copper Oxide Superconductors

2 Sr 2 CaCuCu 2 O 8 + δTemperature dependence of in-plane resistance. (A) and (d) are linear and logarithmic scale temperature vs. resistance plots of underdoped superconductors. For (b) and (e) optimally doped samples, the two-step superconducting transition exhibits a crossover from the two-dimensional to the three-dimensional superconducting phase in the pressure range of 4.9 to 23.1 GPa. This is in good agreement with previous studies. For (c) and (f) overdose (OD) samples. Credit: IOP “width =” 800 “height =” 530 “/>

Temperature dependence of Bi in-plane resistance2Senior2CaCuCu2O8 + δ At various pressures. (A) and (d) are linear and logarithmic scale temperature vs. resistance plots of underdoped superconductors. For (b) and (e) optimally doped samples, the two-step superconducting transition exhibits a crossover from the two-dimensional to the three-dimensional superconducting phase in the pressure range of 4.9 to 23.1 GPa. This is in good agreement with previous studies. For (c) and (f) overdose (OD) samples. Credit: IOP

The discovery of cuprate superconductors in 1986 had a major impact on science and technology, hosting the highest atmospheric superconducting transition temperatures and unconventional electronic behavior in the condensed matter physics and materials science communities. Continues to fascinate. However, the underlying mechanism of superconductivity is a mystery that has not yet been elucidated. Finding a universal link between superconducting states and their adjacent quantum states is considered an effective approach to elucidating the mechanism of high-temperature superconductivity.

Recently, a team of Professor Sun Liling of the Institute of Physics (IOP) of the Chinese Academy of Sciences collaborated with the professor. IOP’s Xiang Tao, Zhou Xingjiang, hu Jiangping Hu, Professor Gu Genda of Brookhaven National Laboratory, and Professor Lin Chengtian of Max Planck Institute Superconducting state Bismuth-based for insulation Copper oxide SuperconductorBy state-of-the-art on-site high pressure measurement.

These experimental results reveal that the observed quantum phase transitions are universal in bismuth-containing copper oxide superconductors, regardless of doping level and number of copper oxides (CuO).2) Plane in the unit cell.

科学者は加圧銅酸化物超伝導体の量子相転移を発見

N-plane resistance (R) and AC magnetic susceptibility (Δχ’) as a function of Bi temperature (T)2Senior2CaCuCu2O8 + δ Superconductors with different pressures: (a)-(d) For underdoped superconductors. (E)-(h) For optimally doped superconductors. (I)-(l) For superconductors heavily doped. The blue line in the figure is the data of Δχ'(T), and the red line is the data of R (T). The red and blue arrows indicate the starting temperature of the superconducting transition detected by measuring resistance and AC magnetic susceptibility, respectively. Credit: IOP

It is a big surprise to them that the system becomes like an insulation after the superconductivity is completely suppressed. Ground state The overhaul-doped non-superconducting copper oxide is in a metallic state, and it is naively expected that the bandwidth will need to be increased by applying pressure.

科学者は加圧銅酸化物超伝導体の量子相転移を発見

Bi pressure-Tc phase diagram2Senior2CaCuCu2O8 + δ Superconductor. The right panel is a phase diagram established by experimental results of underdope (UD), optimal dope, and overdope samples and R mapping information (displayed on a color scale) that depends on temperature and pressure. The left panel is a normalized phase diagram based on the experimental phase diagram (right panel). Credit: IOP

As a result, the system should be more metallic than an insulator. The discovery of this universal quantum transition offers new challenges and new opportunities for a better understanding of the mechanism of superconductivity in these materials.

The study entitled “Quantum phase transition from superconductivity to insulation-like state in pressurized cuprate superconductors” Nature Physics..


New cuprate superconductors may challenge classical wisdom


For more information:
Yazhou Zhou et al, Quantum phase transition from superconductivity to insulation-like state in pressurized cuprate superconductors, Nature Physics (2022). DOI: 10.1038 / s41567-022-01513-2

Quote: Scientists have obtained a pressurized cuprate superconductor on February 21, 2022 from https: //phys.org/news/2022-02-scientists-quantum-phase-transition-pressurized.html ( Discovered the quantum phase transition (February 21, 2022)

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Scientists Discover Quantum Phase Transition of Pressurized Copper Oxide Superconductors

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