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A comment on LK99: Team of Southeast University observed zero resistance below 110 K.
Short summary (not a physicist and consume most of my science in English, so may be slightly wrong):
- The material is fragile, and hard to form into a regular shape
- There's a weird drop in resistance around 230K; could be an artefact of the measurement process or instrument
- On 1 Aug they found a sample with almost 0 resistance, which got them really excited and led to them searching for more
- They tested 6 samples, only one of which exhibited zero resistance at below 110K
Basically, results are inconclusive, but it's promising.
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Short summary (not a physicist and consume most of my science in English, so may be slightly wrong):
- The material is fragile, and hard to form into a regular shape
- There's a weird drop in resistance around 230K; could be an artefact of the measurement process or instrument
- On 1 Aug they found a sample with almost 0 resistance, which got them really excited and led to them searching for more
- They tested 6 samples, only one of which exhibited zero resistance at below 110K
Basically, results are inconclusive, but it's promising.