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Jorge Hirsch, a physicist at University of California, San Diego, questioned the appearance of data demonstrating the extent to which the material could become magnetized, referred to as its “magnetic susceptibility,” and called on the authors to release their raw data.

In addition to looking at magnetic susceptibility, James Hamlin, a physicist at the University of Florida, examined the electrical resistance data from the 2020 Nature paper.

The measurement of this phenomenon does not require any processing to remove background noise like the magnetic susceptibility data do.

“In this paper, our group has done all three measurements, including submeasurements,” such as two different measurements of magnetic susceptibility for both continuous and fluctuating fields.

“The key fields that you wanted to provide, in order to prove superconductivity, is electrical resistance goes to zero, magnetic susceptibility—which is a demonstration of this expelling the magnetic fields—and heat capacity measurements. These are three different directions,” Dias says.