From Almighty Scholar to Chief Scientist

Chapter 318 Make an important achievement casually

Hearing Lin Xiao's words, Zhao Xian couldn't help being puzzled.

Another structure?
What structure to change?
Lin Xiao continued to look at the above data, and did not directly answer his question, but said: "Yttrium barium copper oxide can directly reach the superconducting state only by using cheap liquid nitrogen, but in fact, yttrium barium copper oxide The scope of application of copper oxide is not wide, and now more niobium-titanium alloys are used as superconductors."

"This is because the critical current density of yttrium barium copper oxide polycrystal is too low unless we can prepare it in single crystal form."

"Unfortunately, the cost of preparing the single crystal form is a bit too high, so we have to give up that."

"Ah."

Listening to Lin Xiao's narration, Zhao Xian nodded, he knew all of these, and then said: "However, there is another reason, that is, yttrium-barium-copper-oxygen is too brittle, and cannot have good properties like copper or niobium-titanium alloys. Toughness, so we can't process it into wires, which is very inconvenient."

Lin Xiao nodded slightly, "Yes, so its scope of use is relatively short."

Zhao Xian nodded, but then asked suspiciously, "However, what does this have to do with changing the structure you said? You want to change the structure for YBCO?"

Lin Xiao nodded, and then directly operated the computer without any nonsense.

"Your computer should have a soft armor that simulates material superconductivity... Well, I found it, QE."

Then he directly opened the QE software, entered the software interface, and started using the software.

Looking at Lin Xiao's skillful operation, Zhao Xian couldn't help being surprised.

Generally speaking, when they study superconductors, they also use the method of computing materials to conduct auxiliary research, and there are also some software that can simulate this.

Of course, Zhao Xian is not very good at this aspect. After all, he is already old. He has not studied systematically in the new field of computational materials science, but he just has a better understanding. Of course, his comparison I understand that it means being able to write a few doctoral dissertations in this area at will. After all, for an academician like him, the learning ability is of course very strong.

However, seeing Lin Xiao's operation at this time, he suddenly remembered that before Lin Xiao proposed the theory of electronic topological bonding, he also mentioned a theory called Lin's bonding mechanism. This Lin's bonding mechanism, But it also has a lot to do with computational materials science.

Thinking of this, Zhao Xian couldn't help sighing, no wonder people outside said that Lin Xiao is an all-round scientist, this statement is true.

He turned his attention to Lin Xiao's operation again, but at this moment he couldn't help being stunned: "Huh? What are you doing here? Yttrium barium copper oxygen is not this parameter, is it?"

He suddenly saw that Lin Xiao was inputting various data about the simulated test materials, but these data were somewhat different from the original YBCO, and there were some differences in the crystal structure.

Lin Xiao smiled and said, "I want to do an experiment."

"experiment?"

"Well, this experiment will be carried out on the software for the time being. If the results I expected can be achieved, the Dingguang Research Institute will probably establish a superconducting laboratory in the future."

"Oh? Don't come here to poach our people." Zhao Xian raised his eyebrows and said, "There are very few people in our laboratory."

Lin Xiao smiled and said, "Well, I can't give you a guarantee for the time being."

"Good guy, are you telling me nakedly that you plan to poach people from our laboratory?" Zhao Xian suddenly laughed and cursed, but then he shook his head and said: "Forget it, whatever you want, anyway, I guess it will be soon." Retired, and there are fewer and fewer people working on superconductors these days, if you can reinvigorate young people's interest in superconductors, so be it."

Lin Xiao was silent for a moment, then turned his head and continued to input other parameters, and asked at the same time: "You said, if the room temperature superconductor is really researched, will everyone who has studied superconductivity before will lose their jobs?"

"This..." Zhao Xian was taken aback for a moment, he didn't expect Lin Xiao to ask this matter.

"Well, I don't know. I never thought about it before. After all, I never thought that I would see room-temperature superconductors appear in my lifetime—oh, I have to add a condition of normal pressure, but In any case, even if superconductors at room temperature and pressure appear, the cost of preparation must be high when they first appear. At that time, people can study how to reduce the cost of preparation. It will take another few decades. From the appearance of the personal computer to the appearance of the personal computer, there may be a span of several decades."

"In addition, taking another [-] steps, even if this kind of normal temperature and pressure superconductor really suddenly appeared, and the production cost can be used for civilian use, then compared with the significance of this kind of superconductor to human society, even if there are many People lose their jobs, but the merits are forever."

Listening to Zhao Xian's answer, Lin Xiao nodded.

He once told Kong Huaan that his greatest ideal is to realize communism, and realizing communism requires extremely advanced science and technology, and room-temperature superconductors can definitely be called a necessary technology for this kind of society.

The transmission of energy with almost no loss is of great significance to a society, which means a great increase in productivity and a great development of production levels.

This is why Lin Xiao suddenly became interested in this thing.

However, it doesn't make sense to say these things now, it's better to solve the thing in front of him first, so he didn't think too much, and turned his attention to the computer in front of him again, and continued to operate.

When Zhao Xian saw this, he asked, "You haven't said what experiment you want to conduct yet."

"Oh, this." Lin Xiao replied, "This is an experiment about Cooper pairs."

"Cooper right?"

Zhao Xiansheng had doubts. Cooper pairs are a thing in the BCS theory that explains the electronic behavior of low-temperature superconductors. That is to say, in superconductors, electrons form a Cooper pair in pairs, and then they can achieve superconductivity. That is, the unimpeded flow of electrons in a conductor.

However, in high-temperature superconductors, physicists are still not sure whether the superconducting properties are caused by Cooper pairs, but in the mainstream view, people still believe that Cooper pairs are the main reason for the formation of superconductivity.

And now Lin Xiao plans to conduct an experiment on Cooper pairs. Could it be, "Do you think that in high-temperature superconductors, Cooper pairs are also the main reason for superconductivity?"

Lin Xiao replied: "Why can't you think so? Of course, I didn't say that the Cooper pair is the ultimate explanation of the superconducting mechanism."

"However, I believe that all physicists agree with me that the ultimate fully unified superconducting mechanism must be able to explain why we can no longer easily observe the existence of Cooper pairs in high-temperature superconductors."

"And my experiment is actually to try to find out whether there are Cooper pairs in yttrium-barium-copper-oxygen. This new structure of yttrium-barium-copper-oxygen is the equivalent topological change I made to it according to the electron topological bonding theory. , and then let's take a look at the simulation results of the software. If my guess is correct, although other properties of the yttrium barium copper oxide under this new structure have not changed much, there should be a relatively large critical current density. big change."

"Oh?" Hearing what Lin Xiao said, Zhao Xian immediately became interested. Lin Xiao actually used the theory of electronic topological bonding to study?
Even the equivalent topology of the original yttrium-barium-copper-oxygen crystal structure was directly carried out.

The theory of electron topological bonding has this function, and it can easily calculate the equivalent structure of a crystal structure. The two structures are different, but they can be completely regarded as equivalent.

However, what makes Zhao Xian a little confused is: "I didn't watch your calculations, how can you be sure that the data you input is correct?"

Regarding this question, Lin Xiao took it for granted and said: "Mental arithmetic, this kind of calculation is not very complicated, just mental arithmetic will do."

Zhao Xian looked at Lin Xiao's input of more than 20 data, and he didn't even seem to have a pause. He thought to himself that it would be strange if he believed it. Is this something that can be calculated by normal mental arithmetic?
More than 20 data is not complicated?And Lin Xiao seems to have entered it without thinking. Zhao Xian asked himself that he couldn't do it. As for other people, he might not be able to do it either. It is estimated that only the youngest Fields Medal winner in front of him can do it. .

And now it's just input more than 20 data, look at the situation later, at least you need to input dozens more data, after all, the chemical formula of yttrium barium copper oxide contains thirteen Atoms, plus other data, dozens of data are still relatively small.

So he quietly watched Lin Xiao's input from the side, hoping that he would stop and think.

Zhao Xian even made a bet with himself, that he would drink an extra bowl of soybean juice for breakfast tomorrow.

In the end, it was a pity that after Lin Xiao entered all the data, he did not think for even half a minute, as if he calculated the value of the next data while inputting the previous data.

It seems that tomorrow morning I can only drink an extra bowl of soybean juice with tears in my eyes.

A sad smile appeared on Zhao Xian's face.

"Finished typing?"

Lin Xiao nodded: "It's over."

Afterwards, he pressed Enter, and the software immediately started calculating the data, and a progress bar popped up.

Both of them looked at the progress bar with anticipation, waiting for the moment when it reached 100%.

In this way, time passed quickly, and finally, the progress bar reached 100%, and then, the interface jumped, and the result came out.

Seeing the result, Zhao Xian was shocked: "The critical current density...has actually increased! Why? According to the theory of electron topological bonding, isn't this an equivalent topological transformation? Why does this happen? "

Lin Xiao didn't speak, but just brought a pen and notebook from the side, and then began to calculate on it.

"Add two electrons to the Fermi sea surface of an N-electron system. These two electrons do not interact with the electrons in the Fermi sea, but there is a mutual attraction potential between these two electrons. These two electrons obey the Schrödinger equation. "

【-h/(2m)(▽1+▽2)ψ……】

【最终，我们可以求得：ε=2hωD/(1-e^2/vz)≌-2hωDe^(-2/vz)】

After writing this, Lin Xiao said: "Now, I can believe that the reason for this situation must be due to the appearance of a large number of electron pairs, and even, I can make a bold inference that these electron pairs, and Cooper Pairs are strongly correlated, even they are Cooper Pairs!"

Zhao Xian looked down at Lin Xiao's proof process with a shocked expression on his face.

He never expected that Lin Xiao would come up with such an astonishing conclusion after doing so almost casually.

Once this matter is announced, I believe the entire superconducting world will be shocked.

Because Lin Xiao's proof is equivalent to saying that the Cooper pair still plays an extremely important role in the high-temperature superconductor of yttrium-barium-copper-oxygen!
In other words, he has brought an important result to the high-temperature superconducting mechanism that the superconducting community has been pursuing!

(End of this chapter)