Exploring Microwave Absorption to Reveal the Superconducting Properties of CSLA

Friday - December 22 2023, 02:38 UTC - 11 months ago

The present work aims to explore the superconducting properties of CSLA from the perspective of the absorption of microwaves, which can potentially provide useful and meaningful information. Our results indicate that CSLA has potential to be a promising material for superconducting applications due to its low working temperature, high critical field and low losses.

All previous superconductors have been found to absorb microwaves. It is the nature of superconducting material that they exclude magnetic fields and thus the electronic and magnetic behavior is observed based on interaction with microwaves.

Above- A pictorial representation of a Josephson junction in which fluxoids move or are pinned and quasiparticles in the "middle" material (insulator, conductor, semiconductor) move and oscillate. There are impurities, and the cores of the vortices contain normal electrons, and the core behaves as a normal electromagnetic medium (𝜀, 𝜇, 𝜎). The Cooper pairs are present abundantly on both superconductors and tunnel frequently at the middle.

Microwaves have been used to analyze the early samples of new superconductors so that groups learn how to improve the purity and effectiveness of superconductor synthesis.

As suggested by Lee et al., the structure of CSLA possesses two circles: The outer circle serves as a shield to protect the inner one which forms a quasi-one-dimensional (1D) conducting channel Lee et al. (2023a, b). The essential idea is to substitute the outer lead atoms with copper to shrink the whole structure. This 1D superconductivity model can be well applied to explain the anisotropic levitation posting on the social media and thus greatly inspires us to uncover the possible 1D strongly-correlated mechanism with a magnetic flux. Previously, we have reported that the cuprate radicals in CSLA hold sufficiently long coherence time to be quantum manipulated Liu et al. (2023b), which yields a useful hint for a successful synthesis. So far, only the powder of mixture has manifested possible superconducting features, so normal electric and magnetic measurements are not available in the current stage. Learnt from the research history of other superconducting materials, such as Y-Ba-Cu-O Blazey et al. (1987); Bhat et al. (1987); Durný et al. (1987); Dulić et al. (1990); Bhat et al. (1991), alkali-metal-doped fullerene Bensebaa et al. (1992), magnesium diboride Bhide et al. (2001); Köseoģlu et al. (2003), and iron pnictides Onyancha et al. (2017), the detection of microwave absorption turns out to be an appropriate approach to determine whether there is superconducting phase in the mixtures, which motivates the main subject of the present work.

Here is a list of major papers on microwave absorption experiments with other types of superconductors. A nonresonant microwave absorption has been observed at fields below the thermodynamic critical field in the new copper oxide superconductors. This is associated with flux slippage and allows an estimation of the average area of the uniform phase in the superconducting glass state. In the superconducting state, YBa2Cu3O7 absorbs electromagnetic radiation over a wide range of frequencies (8 MHz-9 GHz). The absorption is extremely sensitive to temperature, particle size and the magnetic field and depends crucially on the presence of oxygen. A possible explanation for the phenomenon based on the formation of Josephson junctions is suggested. Microwave absorption in a dc magnetic field up to 12 kG, attributed to nonequili states, has been observed in PBCO superconductors. The peak absorption frequency is found to increase as the field is increased, suggesting a decrease in the Josephson penetration depth.

In the present work, we aim to explore the superconducting properties of CSLA from the perspective of microwave absorption, and we hope to provide useful and meaningful information of CSLA’s behaviour in the field to the perspective scientific and engineering community. Our results show that CSLA has potential to be a promising material for superconducting applications due to its low working temperature, high critical field and considerable low losses compared to other materials. It is also shown that CSLA is still in its early development stage, and the effects of different components of the material need to be further studied for more advanced superconducting materials in the future.