# Temperature-pressure plot for superconducting records?

Eremets et al. (arXiv:1812.01561, Nature 569, 528–531 (2019)) and Hemley et al. (arXiv1808.07695, PRL 122, 027001 (2019)) have reported new high-temperature record for superconductivity, as covered by MIT Tech Review and Physics Today. Not surprisingly in light of recent trends, the very high temperatures of 250 K and 260 K is only achieved at the very high pressures of 170 GPa and 200 GPa, respectively. (Edit: Room-temperature (288 K) superconductivity has now been achieved at 267 GPa: *Nature* 586, 373–377 (2020) , covered in Quanta. Edit #2: Now retracted.)

I have heard it said that, although record temperatures have been increasing, the temperature-pressure "possibility frontier" is basically unchanged. (See Production possibility frontier for the analogous economics concept.)

Question: Does anyone have a plot of the superconducting records for temperature vs. pressure?

Here are some plots of record temperature vs. time that contain some pressure information, which may allow someone to construct such a plot: 1, 2, 3, 4. I do not know if it's safe to assume that all records without an explicitly noted pressure were performed at atmospheric pressure. #3 is Wikipedia:

(I would also love to know what's responsible for this phenomenon -- previously asked here -- but I think a plot is a good first step.)

• It took me longer than I'd like to admit to figure out that both the horizontal and vertical axes in your plot have non-uniform spacing --- I think it's the uniformly-spaced grid lines that tricked me. If anyone reading this question starts to prepare such a plot on their own, a less-sneaky data presentation technique would be a nice thing to keep in mind.
– rob
Commented Dec 12, 2018 at 20:12
• @rob, it is not his plot. As he wrote correctly, it is from Wikipedia en.m.wikipedia.org/wiki/… Commented Dec 13, 2018 at 3:29
• You can find Tc VS pressure graphs for a different class of superconductors in this review: arxiv.org/ftp/cond-mat/papers/0410/0410367.pdf Commented Dec 1, 2019 at 8:31