1. preprint: These papers are published on the arXiv platform, which is an open online preprint server that allows researchers to share their research results. However, the preprint has not been peer-reviewed, so the results need further verification and review.

2. Claimed discovery: The researchers claimed to have discovered normal-pressure room-temperature superconductors and uploaded their papers to the arXiv platform. However, the research in this field has been controversial in the scientific community, and no stable room temperature superconductor has been found so far.

3. Credibility evaluation: Since there is no other independent research team to verify these findings, it is impossible to determine their credibility. Scientific research needs repeated experiments and extensive recognition to be a credible discovery.

In short, we need to be cautious about these papers that claim to find superconducting materials at room temperature and pressure. For this important scientific discovery, the scientific community usually needs to verify its reliability through the replication research of several independent laboratories. In this case, more scientific research and verification are needed to determine whether the discovery is indeed a major breakthrough.