Scientists are closer to solving the mystery of superconducting with applications in medicine, transportation and energy transfer

العلماء أقرب إلى حل لغز فائق التوصيل من خلال تطبيقات في الطب والنقل ونقل الطاقة

Spin fluctuations and phonons in La2-xSrxCuO4 (x = 0.22) near Qδ. S(Q, ω) as a function of energy and the wave vector along a path through two unequal wave vectors Qδ = (0.5-δ, 0.5, L) and (0.5, 0.5-, L) (see inset of panel a). The integration ranges are L ∈[ − 1, 1]and b L ∈[3.8, 4.2]. Strong phonons (panel b) are observed for L ≈ 4, but these are not visible near L = 0 (panel a) where spin fluctuations are seen. Data were collected on LET (panel a) and MERLIN (panel b). attributed to him: nature physics (2022). DOI: 10.1038/s41567-022-01825-3

Researchers studying the magnetic behavior of copper superconductors may explain some of the unusual properties of their conduction electrons.

Qoprate superconductors used to lift trains, Quantitative statistics and power transmission. It is from a family of materials composed of layers of copper oxides alternating with layers of oxides of other metals, which act as charge reservoirs.

The largest use of superconductors is currently in manufacturing Superconducting magnet They are used in medical MRI machines and for scientific applications such as particle accelerators.

In order to fully realize the potential applications of superconducting materials, the development of superconductors that maintain their properties at higher temperatures is crucial for scientists. The cuprate superconductors It currently shows relatively high transition point temperatures, and thus gives scientists an opportunity to study what makes high-temperature superconductivity possible.

In this study published in nature physicsa collaboration between the University of Bristol, ISIS Pulsed Neutron and Muon Source, focused on the copper-based2-sSRxCuO4 (LSCO). Superconductivity in this system is very sensitive to the exact ratio of lanthanum (La) to strontium (Sr) providing the ability to understand properties associated with superconductivity. LSCO also approaches magnetic ordering and one possibility is that it is magnetic fluctuations that enable it to superconduct.

Inelastic neutron scattering provides an excellent way to study these magnetic fluctuations. The researchers were able to measure a wide range of space and energy scales. This enabled them to form a complete picture of the spin fluctuations and phonons, allowing isolation of very low-energy spin fluctuations.

despite Nobrat Superconductors are metals above the temperature where they become superconductive, and current-carrying electrons behave very strangely. As the temperature increases, its current-carrying capacity decreases dramatically. Low-energy spin fluctuations can scatter conduction electrons and explain this strange metallic behaviour.

Moreover, when the superconductor is cooled and superconductivity is suppressed with a magnetic fieldThe spin fluctuations became stronger and slower, indicating that the material is close to magnetic order. This may help explain the unusual electronic properties of copper.

Professor Stephen Hayden, from the Bristol School of Physics, said: “This study shows the potential importance of spin fluctuations in understanding copperplatelets. A deeper understanding of their properties and their relationship to superconductivity is another step towards designing high-temperature superconducting materials.”

“In the future they should be used for quantum computing, transportation including elevated trains and compact locomotives as well as power transmission. Demonstration projects for the latter are already underway.

“The work is based on the unique hardware and sample environment available in ISIS.”

more information:
M. Zhu et al, Spin fluctuations associated with pseudofilament breakdown in a copper superconductor, nature physics (2022). DOI: 10.1038/s41567-022-01825-3

Introduction of
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