The top student must be diligent.

Chapter 189 Shocked the Scientific Community
FeSe is the simplest type of superconductor among iron-based superconductors. Its internal superconducting properties can be changed through different preparation and synthesis methods.

For example, under normal pressure, it can only superconduct at temperatures below 8K; but through embedding or quenching under high pressure, its superconducting transition temperature can be sharply increased to 38K, and if it is a combination of embedding and high-pressure quenching, the superconducting transition temperature will rise to 48K.

Later, scientists discovered that the FeSe single atomic layer grown epitaxially on SrTiO3 is superconducting with a transition temperature of 70K, and later even reached above 100K.

For example, before, Xiao Yi studied FeSe/SrTiO3 single-layer superconductors and their mechanisms in the research group of Academician Pang Cheng.

It was this research that made him focus on the material FeSe.

Of course, the most important thing is that this material is simple enough and only requires two elements, unlike other high-temperature superconductors, such as yttrium barium copper oxide, which requires four elements.

After such a long period of research and experimentation, Xiao Yi finally found the most perfect form of superconducting FeSe through continuous attempts.

"Unlike the PbO-type FeSe synthesized by common synthesis methods, the hexagonal close-packed FeSe has a stronger coupling form of electron-spin density waves, which enables it to reach a superconducting state at a temperature of 92K."

"This is still the case of silver doping. The doping of silver weakens the coupling strength of its electron-spin density wave. Otherwise, the superconducting critical temperature can be raised to above 110K."

“But it’s worth it.”

Looking at the metal wire in his hand, Xiao Yi smiled slightly.

It is enough for the superconducting critical temperature to be above 77K. After all, liquid nitrogen is 77K, and any higher temperature would be redundant. 92K is exactly 77K higher than 15K, which can be regarded as a very good redundancy both from an experimental and industrial perspective.

"Silver doping can enhance the mechanical strength and processability of the superconductor itself, compensating for the brittleness caused by the hexagonal close-packed structure."

The hexagonal close-packed structure, also known as the HCP structure, is a typical example of magnesium. As we all know, magnesium is quite brittle, so much so that there are even videos on the Internet that specifically crush magnesium metal to relieve stress.

By doping with silver, this brittleness is changed and the number of slip systems is increased, giving it the ability to undergo plastic deformation.

“It’s perfect.”

At this time, Xiao Yi had activated the material control effect unknowingly, and his vision entered the microscopic perspective of the alloy wire in front of him, appreciating the perfect world within it.

Of course, he felt more and more impressed in his heart that mastering materials was truly a superb skill.

If he hadn't mastered the material, he wouldn't have been able to discover FeSe in this structural form.

Well……

But considering that the mastery of materials is his own thing.

He invented this cheat by his own ability, and this silver-doped FeSe was also developed by his own ability!
"Brother Xiao, what shall we do next?"

At this time, the voices of Xu Ming and others were heard nearby.

Xiao Yi stepped out of the material's field of vision and looked at Xu Ming and the others.

At this time, Xu Ming and others looked at Xiao Yi as if they were looking at a god.

This month, under the leadership of Xiao Yi, they almost synthesized this new superconductor as if with divine help.
Well, it cannot be said that they were assisted by God. It should be said that Xiao Yi was that god, because every step they took was almost under the guidance of Xiao Yi, who was like a fairy pointing the way, and they gradually moved towards success.

This feeling is even better than following their senior sister to do experiments.

After all, if they followed their senior sister, they might be stumped by a problem for a long time, but if they followed Xiao Yi, they seemed to have no idea what failure was.

Now, they have this result that is almost enough to win the Nobel Prize in Physics in their hands, and they can hardly contain their excitement.

When Xiao Yi heard their questions, he just smiled and said, "Of course it's to publish a paper."

"but……"

He pinched his chin and said, "Don't mention the preparation method in the paper. Just give the experimental results."

Xu Ming and the others were stunned for a moment, then they all nodded to show their understanding.

If it is just a high-temperature superconductor, the preparation method can be announced casually without any problem.

But for the FeSe superconductor they have synthesized now, it is completely different. Anyone with a discerning eye can see that once this superconductor can be produced on a large scale, it will inevitably become the only choice in the current superconductor market.

Whether compared with niobium-titanium alloy or yttrium-barium-copper-oxide, this new FeSe superconductor has absolutely leading comprehensive advantages.

Considering the economic advantages alone, its preparation method is not suitable for publication.

There is no need to apply for patents because of the complexity of the preparation process, so there is basically no need to worry about others being able to figure out how this material is prepared through reverse engineering.

Considering its strategic value, it is even more important. After all, there are quite a lot of technologies in the world that can use superconductors.

Take the nuclear magnetic resonance apparatus for example. Currently, the apparatuses used are basically low-temperature superconductors, such as niobium-titanium alloy, niobium-tin alloy, etc. As for high-temperature superconductors such as yttrium-barium-copper-oxide, due to some defects inside them and their critical magnetic field strength is not high enough, they are not within the technical scope of the nuclear magnetic resonance apparatus.

However, based on the properties of FeSe, it will be enough to completely replace low-temperature superconductors such as niobium-titanium alloys and niobium-tin alloys, and become the core component of the superconducting system of nuclear magnetic resonance equipment.

Perhaps they can take this opportunity to help domestically produced MRI machines enter the world market.

In addition, many other industries will also be able to use this new superconductor.

Not to mention, it can also assist important scientific research projects.

Quantum information is one, and the EAST controlled nuclear fusion reactor on the Science Island is also one of them.

"I'll write it right away!"

Xu Ming said.

Xiao Yi nodded, and the matter was handed over to him.
According to what he said before, besides him, Xu Ming and others can be assigned as second authors.

It is quite good that they were able to get the second work for such an important achievement.

They will even be able to be nominated when the natural science awards are presented.

Xiao Yi didn't mind taking them for a ride.

"Also, I have to contact Principal Bao and tell him the good news."

Xiao Yi smiled slightly. This fat principal had supported him and even got him an investment of 3 million yuan. Now it was time to let Principal Bao know how valuable those million yuan were.

Well……

Even the entire Science Island laboratory, plus the land below, is completely worth it.

He immediately took out his cell phone and called Principal Bao.

Soon the call was connected, and Principal Bao's hearty laughter came from the other end: "Professor Xiao, how come you have time to call me today?"

"I have something to ask Principal Bao!" Xiao Yi also laughed and said, "Haha, I hope I didn't disturb you?"

"No, tell me, what's the matter?" Bao Hexin said.

Xiao Yi said: "I would like to ask President Bao to come to the Science Island Laboratory and show you something."

"Oh?" Bao Hexin raised his voice and said jokingly, "If it wasn't a surprise, I wouldn't have come."

Xiao Yi smiled and said, "Don't worry, you won't regret coming here."

"Okay, I'll come right away."

Bao Hexin said with a smile.

Then they didn't say anything more and hung up the phone.

After putting down the phone, Xiao Yi thought for a moment, then called again. This time, he informed Pan Wei.

According to their experimental measurements, the new FeSe superconductor also has excellent quantum communication properties, such as high coherence time and low noise, which are the most important characteristics of superconductors for superconducting quantum computers.
So it seems that this new superconductor can also bring huge surprises to people like Pan Wei who are studying quantum computers.

……

After half an hour.

"What? 92K superconducting transition temperature? Even the critical current density is as high as 10 to the 7th power ampere, and the critical magnetic field strength is at least 25T?"

"And it also changes the original brittleness of FeSe itself? It has good machinability?"

"Are you sure you're not kidding??"

When Bao Hexin arrived at the Science Island Laboratory and saw the experimental report that Xiao Yi handed him, his eyes widened and he looked at the data listed in the report in disbelief.

And next to him, Pan Wei's face was full of disbelief.

"This...this...this..."

"The energy relaxation time is between 20-100 microseconds, and the phase coherence time is between 10-50 microseconds... This is the coherence time at the level of pure aluminum! How does this high-temperature superconductor achieve this?"

“The quality factor is also around 10^5 to 10^6, and the degree of energy loss and signal attenuation is surprisingly low!”

"And this tunneling junction characteristic... R*C is approximately equal to 1-10Ω·fF, which..."

For a moment, he couldn't help but stretch out a hand and touch his head, feeling deeply incredible.

This thing is so much better than the superconductors such as pure aluminum and pure niobium that they used before.

This can basically be called the best superconducting material for superconducting quantum computers today!
“How on earth did they do this…”

The data was so good that he almost suspected it was fake.
The shocked looks on the two men's faces were seen by Xu Ming and others who were watching nearby.

They all couldn't help but snicker.

These two big shots in the school actually have such uneasy moments.
Not even as good as them!

They completely forgot how shocked they were when they saw the experimental results for the first time.

Finally, Bao Hexin and Pan Wei looked at Xiao Yi, who was standing next to them with a calm expression and a cup of tea in his hand, and asked, "Xiao Yi, where is this thing?"

Xiao Yi laughed, then put down the teacup in his hand and said, "Come on."

Finally, he took the two people to the sample storage room, took out the new type of FeSe they had synthesized and showed it to them.

"You two can take two samples back for experimentation."

The two looked at the samples in their hands.

There are absolutely no protective measures, which also shows that this material has good environmental resistance.

Simply put, it is durable.

I pinched it and bent it, and found it to be very flexible. It doesn't look like a HCP structure material at all.

"That's amazing." Bao Hexin couldn't help but sigh.

His own direction is also closely related to the materials, and he knows too well how impressive Xiao Yi's achievements are.

Pan Wei also nodded and said to Xiao Yi: "Thank you, Professor Xiao. I will try it when I go back now."

"Also...when the production volume increases, can you give priority to providing a batch to our laboratory?"

Pan Wei requested.
If they want to build a superconducting quantum computer, they naturally need a certain amount of superconductors.

Xiao Yi smiled and said, "Of course no problem."

“Although the synthesis method is slightly complicated, there is no need to worry about the yield rate. Even if we want to mass-produce it, it will not be too difficult.”

"That's good."

Pan Wei nodded.

Afterwards, Bao Hexin and Pan Wei did not stay long and took the samples back to their laboratory to verify the properties of the samples.

The verification process did not take long, and soon they came to the same conclusion.

This new FeSe superconductor is the most perfect superconductor in the world today!

Their experimental results spread immediately.

The most perfect high-temperature superconductor!

What an amazing result!
Within just one day, some laboratories in the country's top universities learned about this matter and sent applications to the Science Island Laboratory, hoping to obtain a sample for measurement.

Naturally, Xiao Yi did not reject these applications. They were just samples and would not be a problem.

As for asking about the preparation method, no one asked because Xiao Yi had already made it clear that he would not disclose the preparation method.

The method of making this thing is probably worthy of being a state secret.

However, in the past few days, it was only circulated in a small circle and did not spread widely.

It was not until three days later, when Xu Ming completed the paper, that they first posted it on arxiv.

Thanks to Xiao Yi's name, this paper spread all over the world the day it was published.

In an instant, the entire scientific community was shaken.

……

"The new FeSe superconductor synthesized in Xiao Yi's laboratory? Can it replace the most commonly used superconductors?"

"What is the most perfect superconductor in the world today?"

“92K超导转变温度，10^7A/cm^2的临界电流密度，还有27T的临界磁场强度？”

"I bought it!"

"..."

Whether it is the field of physics, materials science, chemistry, life sciences, etc., everyone was shocked by the news.

Although quite a number of new high-temperature superconductors have been born due to the XSC theory, these high-temperature superconductors have not received much attention due to various shortcomings.

Of course, this does not make people lose confidence in the XSC theory. After all, truly heavyweight results are never afraid of being late.

But what no one expected was that it just appeared like this, and it was almost flawless.

Probably, except that it is not a room-temperature superconductor, this superconductor has no difference in terms of its application.

……

(End of this chapter)