The original South Korean researchers of the LK99 room temperature and room pressure superconductor appears to have a withdrawn abstract. This could mean the presentation is withdrawn.
UPDATE The abstract and talk were restored. There was a fake withdrawal by someone pretending to be lead researcher Hyun-Tak Kim.
The abstract of Hyuntak Kim APS march meeting has been withdrawn. But we don't know yet if this means "meeting withdrawal" or not. pic.twitter.com/rjhZX3AP6I
— sejong (@gimjiun79102152) February 17, 2024
Three months ago there was the announcement of the LK99 presentation. It would be good to have the information presented and discussed but if APS was having a dispute with the LK99 researchers then the koreans could choose to present elsewhere.
Abstract: A16.00002 : Partial levitation, type-II-superconductor characteristic, at room temperature and atmospheric pressure in PCPOSOS 8:12 AM–8:24 AM
Presenter:
Hyun-Tak Kim
(College of William and Mary)
Authors:
Hyun-Tak Kim
(College of William and Mary)
Sukbae Lee
(QERC in Korea)
Sungyeon Im
(QERC in Korea)
SooMin An
(QERC in Korea)
Keun Ho Auh
(QERC in Korea)
Collaboration:
College of William & Mary, Quantum Energy Research Center in Korea
We synthesized materials, Pb10-xCux(P(O1-ySy)4)6O1-zSz (PCPOSOS), called PCPOSOS, which exhibit superconducting behavior at room temperature and atmospheric pressure. These materials displayed characteristics of a superconductor, including zero resistance, the Meissner effect, and partial levitation when placed on a magnet (arXiv: 2307.12037). The partial levitation is caused by an inhomogeneity in the magnetic field of the magnet and occurred within the range of critical magnetic fields, Hc1 and Hc2. That is, the magnetic field of the magnet increased with going from center to the edge of magnet. The magnet had approximately 2000G at the center and approximately 3,000G at its edge. The levitation occurred near center. This indicates the center of the magnet is close to Hc1. It disappeared between center and the edge near Hc2, with Hc1 being much smaller than Hc2, because the magnetic moment at Hc2 is much smaller than that at Hc1. When the magnet is slightly moved, the levitation returns to its original position. This phenomenon is analyzed as flux pinning, which is typical of a type-II superconductor. Moreover, the quantum-locking phenomenon, characteristic of a Type-I superconductor, may appear. However, we interpret PCPOSOS as a Type-II superconductor. We will show two videos of levitations and two videos of magnets.
Nextbigfuture observes that there does not look like there will be thin film LK99 results at the March, 2024 presentation.
China Research and Other LK99 Research is Still Developing
Chinese universities and research labs have published experimental evidence in support of LK99 as a room temperature superconductor. The amount of superconducting material that is made in pile of LK99 powder is small. The LK99 needs to have precisely located copper and phosphorous. This leaves one dimensional molecular chains of superconducting material. All previous superconductors have been found to absorb microwaves. It is the nature of superconducting material that they exclude magnetic fields and thus the electronic and magnetic behavior is observed based on interaction with microwaves.
The US military (Air Force Research Lab) gave some small funding to Chapman University to work on thin film LK99. Thin film LK99 is the only form of the materials with reported superconducting levels of low resistance.
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There are multiple ways to design and engineer the bandgap: https://en.wikipedia.org/wiki/Band-gap_engineering
As for what “properly designed” means, a few criteria should be satisfied for room-temperature ambient-pressure superconductor candidates:
The forbidden energy gap should be at least approximately 0.025eV (room temperature kinetic energy of molecules or atoms.)
The gap shouldn’t be the direct bandgap type in order to avoid charge carriers of opposite charges to combine directly — we want charge carriers to stay around to conduct electricity, right?
There should be fairly flat bands near the Fermi energy, in the Dispersion diagram.
Macroscopic ambient-pressure room-temperature quantum phenomena exist and the energy scale involved in this type of superconductivity isn’t far away from room-temperature kinetic energies of particles.
The problem with the cold fusion claim was that the energy scale seems rather unattainable ordinarily (although we may have some cosmic-ray muons every now and then) through electrochemical means.
The gap in energy required to bunch up charge carriers is a material-design problem, not an energy scale problem. The kinetic energy of particles at room temperature is about 0.025eV. With most organic reactions taking place clustering around energy scale near 1eV, it seems that organic superconductors have decent chance of being ambient-pressure room-temperature superconductors if designed properly. Here’s wikipedia article about organic superconductors: https://en.wikipedia.org/wiki/Organic_superconductor
William A. Little proposed an organic superconductor a long time ago, too.
Next Big Andrea Rossi?
I have spoken at APS many times. APS is a confetence where every abstract no matter how dubious will be accepted. So if an abstract is withdrawn it’s because it has been requested by the authors, not due to some tiff with the conference organizers.
A high temperature Superconductor is a Physical object.
You do not need any papers or conferences, etc.
All you need is a small disk of the substance.
Go into the headquarters of any major tech company and show them the object.
Let the tech company handle the patents and legal stuff.
Just take a few percentage of the revenues from the product.
Instant multi-billionaire with Nobel Prize potential.
The way this is being handled by the Koreans is 100% classic scam-artist hustle.
The c reproduction of this material in large quantity (in what you called, “a small disk”) may very well be the big issue here.
I saw Iris Alexandra’s broken “small disk” and the tiny speck which had levitated in a video. They were vastly different in size.
The other South Korean researchers moved over to the IBM-funded continuing effort so yeah, they are probably doing exactly what you said — cashing in on board director’s fees.
Its kind of … coincidental … in a way, that Sabine Hossefelder just yesterday (or maybe even early today) released a video that cited THOUSANDS of retracted papers, seminars, symposia, articles, both preëmptively (before publication/meeting) or posthumously. Remarkable.
Here’s a linkie. https://www.youtube.com/watch?v=6wN8B1pruJg
⋅-⋅-⋅ Just saying, ⋅-⋅-⋅
⋅-=≡ GoatGuy ✓ ≡=-⋅
This is super sketchy. A lack of transparency is the first sign that someone’s trying to pull the wool over your eyes. Holy-grail results like LK99 or cold fusion that just aren’t reproducible die a slow and painful death over decades as people try again and again unsuccessfully to reproduce the world-changing effect.