Chapter 439: Iron-based superconductor

Chen Zongze is currently studying the yttrium-barium-copper-oxygen superconducting material, which is called copper-based metamaterial. The basic design concept of these materials is to dope other elements on the copper oxide matrix, such as yttrium, praseodymium, neodymium, and so on. As soon as the copper-based superconducting material came out, it quickly broke through the 77k liquid nitrogen boiling point, triggering a surge of superconducting applications in the liquid nitrogen temperature region.
However, the fatal weakness of copper-based superconducting is that copper oxide is essentially a ceramic material, lacking toughness and ductility, and has extremely poor mechanical properties. This weakness makes the preparation of copper-based superconducting materials quite difficult, especially when it is to be made into a linear or ribbon material, other tough materials must be used as the substrate.
In addition, although the maximum critical temperature of copper-based superconducting materials has reached 135k under normal pressure and 164k under high pressure, the room temperature requirements of about 300k are still far away. The most important thing is that scientists through theoretical research believe that 164k may be close to the highest theoretical upper limit of copper-based superconducting materials. In other words, don't look at the development of copper-based superconductors in full swing, but if the ultimate goal is room temperature superconductivity, then copper-based materials can already be considered washing and sleeping.
In addition to copper-based materials, scientists have also studied magnesium diboride and organic superconducting materials, but progress has been very slow, especially in terms of failing to form a theoretical breakthrough. In the first few years of the 21st century, superconducting research seemed to have entered a dead end, and it was difficult to find a new direction.
In early 2008, Hideo Nishino's research team reported that 26k superconductivity was observed in fluorine-doped lanthanum iron arsenic compounds. Chinese scientists who have previously explored new superconductors in similar structural systems have received this news and quickly replaced lanthanum in materials with elements such as praseodymium, cerium, praseodymium, neodymium, praseodymium, etc., and broke through 40k in just tens of days "McMillan Limits." Thus opened the door to iron-based superconducting materials.
The discovery of iron-based superconducting materials is another revolutionary discovery in superconducting research. Although the iron-based superconducting material did not break through the 77k liquid nitrogen temperature zone until the Qin Hai crossing, scientists believe that this is only a matter of time. In the future, room-temperature superconducting materials are likely to be used in iron-based superconducting materials. Was born in the guide material.
Qin Hai is very familiar with this piece of history of science. Since there is an opportunity to repeat it. He will not refuse to give his family the honor of discovering iron-based superconducting materials. And he wants to be in his own hands. The critical temperature of iron-based superconductors has been raised to room temperature, so as to finally solve the problem of room-temperature superconductivity for a century.
Hearing Qin Hai's words of iron-based superconductivity, Tranquility frowned, and said, "Qin Hai. But this time you were very wrong. According to the theory of superconductivity, it is impossible for a substance with magnetic properties High-temperature superconducting. Iron is a typical magnetic element. When we design superconducting materials, we try to avoid the presence of iron. "
Qin Hai laughed: "Who told you that the theory of superconductivity must be correct? Or, who told you that there is only one superconducting mechanism in nature? I don't tell you how I considered this principle, but I May I suggest that you try to dope iron and arsenic compounds with different elements, and I guess you can observe the superconducting properties in them. "
Within a few years of the concept of iron-based superconductivity, scientists have discovered hundreds of iron-based superconductors. Some people estimate that the number of members of the iron-based superconducting family can reach more than 3,000. In this case, Qin Hai didn't have to directly tell Tranquil about the experimental thoughts of later Japanese, he just pointed out this direction. Even if serenity is accidentally hit, it will definitely hit one of them.
"It's strange, brother, why are you so confident?" Qin Shan turned to look at his brother and asked curiously. When she was in middle school, she only knew that her brother hadn't attended high school. However, she is familiar with high school knowledge and can give her and Serenity many precise instructions. After going to college. She just realized that his brother is far from simple homework. He is almost familiar with the development trend of materials technology. He can give you an idea and write very good articles. If the guidance in high school can still be explained by studying carefully, these pointers in scientific research can only be described by unpredictable.
Fortunately, whether it is Qin Shan or tranquility, under the influence of Qin Hai's subtle influence, this miracle has become a little numb. Occasionally there is doubt, and because habit becomes natural, this doubt is left behind. Regarding Qin Hai's instructions, their common response now is to quickly record and then work hard in the direction of Qin Hai's finger. They know that there must be a big fish in this direction.
"Iron-based superconductor ..." Tranquility slapped his forehead and said, "Is this related to the scattering of electrons from holes and electron-type Fermi surfaces? Teacher Chen said one such conjecture at an academic conference It ’s just that I do n’t have time to do experiments. Qin Hai, would n’t you also think that after listening to Mr. Chen ’s report?

"I am afraid that there is more than Mr. Chen who has this kind of conjecture." Qin Hai said with a smile, and what calmness and Fermi noodles he said, Qin Hai only knew about it, but he didn't know why, and then went on to say It's going to be exposed. He waved his hand: "This kind of theoretical problem, don't make it difficult for me as a technical school student. If you take the time to experiment, if you have any problems in theory, go to Teacher Chen to discuss. However, you must keep this idea confidential first. , In case it leaks out and is known by others, you won't be able to grab the originality. "
"Don't you ask us all to do applied research? How can I have time to do these experiments?" Serenity laughed quietly, bringing Qin Haiyi to the army.
Qin Haizhengzheng said: "Doing applied research, that's a matter for others. Are you still a major shareholder of the research center, do you still need to do this kind of thing without technical content?"
If Zhang Shengying heard this, it is estimated that an old blood spurted out directly. As a big professor, she was forced to do applied research, otherwise she would not want to get experimental materials. Quiet, such a first-year straight blog, can actually enjoy the treatment without application and concentrate on the theory. Is there any logic in this world?
Tranquil apparently thought of this too, she said, "I don't dare, the classmates should say me back."
Qin Haidao: "It's not difficult. I told Teacher Chen and let him arrange you to do this new direction. After writing the article, let Teacher Chen be the first author and you should be the corresponding author. He will not disagree. "
"If this experiment can really be done, it will completely subvert the traditional superconducting theory. There is really hope for nature in such an article. If you tell Teacher Chen like this, he will definitely agree, or even put The strongest people are all calling in this direction. "Serenity said.
Qin Haidao: "This is not okay. It is found that the honor of iron-based superconductor must be yours. You cannot let other people take it away. You can rest assured that it is not easy for others to grab it. The preparation of iron-based materials is much more difficult than copper-based materials, and costs It ’s also much bigger. I do n’t nod. Others ca n’t get that much money for sample preparation, so you can do it boldly. Glory belongs to tranquility. I ’m bullish on you.

Serenity smirked: "Since you are so sure, why not do it yourself? Give me such a good idea, aren't you disadvantaged?"
Qin Shan grinned with a pout and said, "Xiao Jing, don't pretend to be foolish, isn't my brother's yours, and still pretend in front of me?"
"Xiao Shan, don't you want to eat apples?" Tranquilly threatened holding the halved apple, but his eyes were secretly glancing towards Qin Hai.
Regarding her relationship with Qin Hai, whether it is Qin Shan, Qin Ling, or her own brother Ning Mo, she has been half-joking and half-seriously piercing countless times, but the big wood of Qin Hai has never been loose. Passing, I really don't know what he thinks.
In fact, Qin Hai was attracted to this beautiful and cheerful girl as early as when she first saw tranquility, otherwise he would not be sticky and unclear with tranquility in the following years. Not good. The key point is that Qin Hai, as a traverser, had already reached the age of 30 in the previous life. When he first saw tranquility, tranquility was only 16 years old. It was a typical green apple, which made Qin Hai able to escape.
It is such a psychological obstacle that has accompanied Qin Hai for many years. To this day, Tranquility has graduated from college, and Apple has become attractive red. Qin Hai felt that he could accept this temptation. A few days ago I went to the Superconducting Research Center. Brother Hou said that every day there were a lot of puppets driving luxury cars to harass tranquility. This gave Qin Hai a little sense of crisis. What about quiet confession?
"Xiao Jing ~ EbookFREE.me ~ Xiaoshan didn't say, I still forgot. Listen to your brother Hou said that during this period, many people drove a luxury car to the research center to find you, this is What happened? "Qin Hai asked leisurely.
Tranquility flushed and took a sip, saying, "Is n’t it all some tyrants who think they are rich? Many of our schoolmates who have graduated in the school in the past, and do n’t know how to hear my name, just drove. Come here to make friends with me. Some said they would take me to dinner, some said they would invite me to a movie, and some were already uncles in their 30s.
By the way, there is another man who ridiculously killed me. He is fatter than my brother. He also told me that day: Ning Shimei, a young talent like Yushu Linfeng, where do you go? "
Speaking of this, she stood up and motioned for the waistline of the man, and then she burst into tears with Qin Shan.
"Your circle is really chaotic ..." Qin Hai also commented with a smile, and then asked, "None of these people can you see?"
"What do you say?" Tranquility stared at Qin Hai and asked, "Do you particularly want me to find one that can be seen among them?" (To be continued)