China’s LK99 wikipedia reports that University of Electronic Science and Technology of China , South China University of Technology , Central South University are making LK99 samples which could have one-dimensional superconducting chains.
These are translations of incomplete research reporting and wikipedia entries. However, the basic point is that there is a lot experimental work to be done before concluding that room temperature superconducting phases can be ruled out. One dimensional strands of superconductance would be difficult to make and difficult to detect.
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