Last month, the South Korean room-temperature superconductivity incident finally settled - * beenRetraction
At that time, Shichao had a sense of chasing the drama to the finale.
I think that the matter of room temperature superconductivity will at least have to stop for a while.
But I didn't think that just yesterday, when Shichao was surfing the Internet, I saw the words "room temperature superconductivity" again, which were clearly hung on Zhihu's hot list.
I can't help but want to sigh,Why do I seem to have watched this episode?
And this time, the protagonist is usDomestic research team
Just a few days ago, a collaborative research team from South China University of Technology, Central South University, and University of Electronic Science and Technology of China submitted an article on the preprint platform arxiv.
The main thing in it is that the research team is in-twenty-four degrees CelsiusThe conditions under which they were found to be prepared in the material may be presentSubstances with superconducting propertiesProfessionally speaking, it isSuperconducting phase
Everyone may have also discovered it, although netizens are all in the name of room temperature superconductivity to discuss this achievement.
But strictly speaking, even if everything is really true, it is not enough to be called room temperature, at bestNear-room temperature superconductivity.
However, it is more than minus 20 degrees, and the superconducting field is also the superconducting material closest to room temperature.
What's more, the lowest outdoor temperature in the Northeast is now more than 20 degrees below zero, to put it mildly"Northeast" room-temperature superconductivityIt's not too much.
In order to be able to eat the melon more thoroughly this time, Shichao also contacted Professor Xi in the team this time and found out some news.
In fact, the results of this time can be regarded to a certain extentFollow-up to room temperature superconductivity in South Korea
At that time, when netizens were arguing about the room-temperature superconductivity of LK99 materials, a number of university research institutions in China had started a wave of reproduction.
You may still have a little impression of the B station of "Guanshankou Male Technician", and the follow-up popularity has gone down, and it is estimated that many people have not paid attention to it anymore.
But they have a lot more patience in scientific research, and some of them really get some inspiration from the LK99 material.
The joint team of Professor Xi's three universities is one of the reproduction army, and what they have done during this time isThe structure of copper-doped lead apatite is constantly adjusted, and then test whether there is any superconducting material in it.
Actually, back in the morningAugustWhen South Korea's LK99 was being fried, the team detected a superconducting signal in a sample.
At that time, they didn't make much noise, and they deliberately avoided this phenomenon when they drew the picture, after all, there is only this one sample, and accidental phenomena can't be ruled out, and it's really not convincing to put it in **.
However, although it cannot appear in **, it is this sample that has become the breakthrough point for the team to discover the superconducting phase in the future.
They took the sample that found the superconducting signal and repeated and adjusted the process to synthesize a sample that resembled a superconducting signal.
In addition, Professor Xi also said that in order to prove that the synthetic material was not accidental, the team verified each dataMore than three timesSamples of the same nature are also guaranteedThere are at least three
Directly from the source, the situation that the last Korean lk99 could not reproduce was broken.
In the end, the research team repeated the adjustment many times, and the whole material with superconducting signal basically has nothing to do with South Korea's LK99, and the crystal structure is completely different.
When it comes to superconductivity, everyone who understands it will immediately think of its detection two-piece set, one isZero resistance, the other isFully diamagnetic, also known as the Meissner effect, which is also a well-established detection method in the industry.
However, the research team used a relatively new method this time, and some netizens even felt that this method was a little controversial.
In the process of communicating with Professor Xi, we learned that there is a premise for testing with traditional methods, and the material to be tested is eitherPure superconductors, or very few impurities.
If the material does not meet this premise, traditional methods are of little use to it.
And the team's work is still in the process of "detecting whether there is anything in the material."Substances with superconducting propertiesThe content will definitely not be high to **...
So they made a very bold decision to useMicrowaveto detect substances with superconducting properties in materials.
Professor Xi told us that using microwaves to measure is equivalent to measuring AC magnetic susceptibility, which is much more sensitive than traditional methods.
In the experiment, they discovered synthetic materials, there are kindsA special magnetic phenomenon, turning the direction of the magnetic field can make this phenomenondisappears
In general materials, this is simply not possible, if there is, thenIt can only be superconductivity
Therefore, according to Professor Xi, their current results have been preliminarily proved that the materials they synthesize have superconducting properties.
After that, the work is constantPurificationto make a true superconductor.
As for how the materials were prepared this time, ** did not reveal too much. We also tried to ask Professor Shimo, and he said that the details could not be disclosed to the public at this time.
But after seeing some of the details he mentioned in his Zhihu post, like whatHands are screwed bald skinThe prepared pan is friedWait, wait, Shichao is really a little curious about the specific preparation process.
Squat for a follow-up...
Having said that, although the method used by the team is more sensitive, there is no precedent for such a superconductivity test in the industry, and we dare not make a conclusion about the degree of recognition.
However, Professor Xi feels that in the field of superconductivity at such a high temperature, many things are new, and everything needs to be explored, including detection methods, and it is not impossible to use microwaves to measure superconductivity.
In general, the research team only found superconducting substances in materials, which are still close to true superconductorsIt's a long distance
But if the results in ** are really true, then there must be a breakthrough.
According to Professor Xi, this achievement is equivalent toKnock openThe door to near-room-temperature superconductivity, at least this lets everyone know that refrigerator superconductivity or northeast room-temperature superconductivity is also possible.
And now, after experiencing the previous few room-temperature superconductivity "such as conduction" turmoil, the network has now been automatically dividedThere are two factions
Just like the literal meaning, the guide is optimistic about room temperature superconductivity, and the sending school is looking for loopholes from the guide and thinks that room temperature superconductivity is no fun.
For example, after the last time there was room temperature superconductivity in Korea, the team of Professor Hye we mentioned above was the Guide, and they migrated from LK99 to other materials that may contain superconductors.
The representative of the sending is the research team of the Quantum Materials Science Center of Peking University, which successfully cracked down on the counterfeit lk99.
In the past two years, anyway, the guide faction has been sending back and forth, and the fight has been inextricable.
What Shichao wants to say is that the existence of these two factions also has their rationality, and they are not necessarily incompatible and completely opposed.
After all, the truth is all in this way and againThe more you argue, the clearer it becomesThis is especially true in the uncultivated land of room-temperature superconductivity.
The more intense the confrontation between the two sides, it means that the fire in the field of room-temperature superconductivity has not been extinguished, and it is still possible to achieve it.
But as netizens said, in this "war", the sending faction has to come out to fight fakes every time, and the guide faction,It only takes one success to be enough