A New Hyun-Tak Kim LK99 Superconducting Paper Will Published in About 3-5 Weeks

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Hyun Tak Kim and other members of the original korean LK99 room temperature superconducting team should have an American Institute of Physics Materials journal paper published in about 3 to 5 weeks. They submitted a version and have been asked to make revisions.

The key information that I would like to see is verified or verifiable proof of the superconductance of the thin film LK99 material.

Q-center Patent on Thin Film Superconductance

The key part of the prior room temperature superconductance claims in the patent and the first papers.

* More description of the vapor deposition process that makes the micron(s) thick thin film which is the only material claimed to be superconducting
* They claim they get 48.9% of the lead apatite thin film as superconductive.

The description and proof on the thin film requires far more detail in any new paper from Hyun-Tak Kim.

The matching international patent is here. WO2023027536 and WO2023027537

In the patent, they show and state there is superconducting levels of low resistance. The resistivity of LK-99 was 1/10,000 to 1/100,000 of copper.

For Example 4, the grains of the solid phase reaction were processed into a square shape and the resistance change according to the temperature change (304K ~ 382K) was measured using equipment (Power (voltage/current) Source KEITHLEY 228A, Sensitive Digital Voltmeter KEITHLEY 182, Probe Method: Measured using the 4-probe method) and the results are shown in FIG. 29. Referring to this, it can be seen that the ceramic compound according to the present invention exhibits superconductive properties.

In addition, FIG. 42 is a photograph of an experiment in which resistance was measured in real time for Example 4, and the measured resistance was approximately 10^-12 Ohms per centimeter. Very low resistance in Ohmcm.

Thanks to twitter user @8teAPi for the info on the patent info.

* More description of the vapor deposition process that makes the micron(s) thick thin film which is the only material claimed to be superconducting
* They claim they get 48.9% of the lead apatite thin film as superconductive. There is also lead compounds (40%) and Copper compounds (10%).
* The new description includes some silicon in the process
* lead apatite itself is an insulator and the korean team says they need doping and defects to make it into a superconductor
* The superconductor consists of lead apatite of phases with three different critical temperatures of Tc, I~50C, II~80C, III~125C
* In thin film, only Tc I, II were seen with resistance measurement
* they say there is diamagnetism and ferromagnetism. They say both of these are intrinsic to the mixture
* they say the Meissner effect is underneath the diamagnetism and ferromagnetism. They provide the method to measure the superconducting features
* Scanning Electron Microscope pictures of all the important phases in both methods
* much more detailed measurements and graphs

Solid State Synthesis
– they’ve described this before, but now include a little Silicon in the mixture. But they don’t say how the Si got in there!
– They claim they get 48.9% lead apatite which is superconductive, with two other lead compounds (40%) and Copper compounds (10%).
– However lead apatite itself is an insulator, they say they need doping and defects to make it into a superconductor
– I am still not clear where in the solid state process the superconductor emerges.

For both methods
– The superconductor consists of lead apatite of phases with three different critical temperatures of Tc, I~50C, II~80C, III~125C
– In thin film, only Tc I, II were seen with resistance measurement, while Tc II and III were seen with magnetic susceptability measurement due to higher sensitivity

Magnetism
– they admit diamagnetism, they admit ferromagnetism. They say both of these are intrinsic to the mixture
– they say the Meissner effect is underneath these, and they provide the method to measure it
– the secret is a very low magnetic field generated by the SQUID, while heating and cooling the material
– this allows detection of the expulsion of the flux by the superconductor

Some Prior Hyun-Tak Kim Work

Hyun Tak Kim’s twitter feed has some tweets about his prior papers and work on superconductors.

Mott Switching and Structural Transition in the Metal Phase of VO2 Nanodomain
Chang-Yong Kim*, Tetiana Slusar, Jinchul Cho, and Hyun-Tak Kim* (2021)

VO2 undergoes the insulator–metal transition (IMT) and monoclinic–rutile structural phase transition (SPT) near 67 °C. The IMT switching has many applications. However, there is an unresolved issue whether the IMT is a Mott transition or a Peierls transition. This complication is caused by metal and insulator coexistence, which is an inherent property of the IMT region. Thus, the acquired data in the IMT region are averaged over the two phases in many experiments. We overcome the issue by probing the electronic state of the monoclinic structure and by introducing a model that accounts for the coexisting phases. We reveal the Mott IMT in the nondistorted monoclinic nanodomain between 55 and 63 °C and the distortion-assisted SPT above 60 °C.

4 thoughts on “A New Hyun-Tak Kim LK99 Superconducting Paper Will Published in About 3-5 Weeks”

  1. For some reason, 🤔 I don’t see as many pompous know-it-alls with so much to say now. Hmmmm……. maybe you spoke too soon with the naysayer “actually” nonsense? I’m going to revel in so much schadenfreude when these gentlemen advance the entire world of technology to apparently so many’s chagrin!!!

  3. I note the comment about the colour in Ate-a-pi’s tweet.

    Would superconductive material be actually optically reflective? Perhaps even very highly reflective?

    I understand there is a correlation between reflectivity and conductivity for some normal conductors.

    If so it interesting that most the failed replications seem to have dark or mixed colours and textures. But maybe if just the odd micro grain is superconductive that might be expected.

    I wonder if it could be used to identify the superconductive parts of the samples.

  4. “The key information that I would like to see is verified or verifiable proof of the superconductance of the thin film LK99 material.”

    Well, yeah. Its like asking the Pope what his religious denomination is.

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