Research starts with PhD students

Chapter 335 This is totally incomprehensible!

In order to create a strong magnetic field exceeding 3T in a very narrow environment, superconducting technology must be used.

Inside the device, there is strong magnetic interference superconducting decay, hyperon movement and decay heat dissipation environment, the temperature and particle movement are greatly affected. The constructed strong magnetic field also needs to be in contact with the outside world, so its temperature will definitely be affected. It is very difficult to maintain ultra-low temperature.

"The critical temperature of the materials currently used is very low. Only when the temperature is kept below 9K can the strong magnetic field created be guaranteed to remain stable."

"We did several simulations and all failed."

"The temperature is rising too fast. It's impossible to maintain it for even a few seconds."

"We have determined that drastic cooling is not feasible."

The problem is mainly with temperature conduction.

Temperature conduction takes time, but the problem is that the temperature required for superconductivity is too low. Only a little bit of energy is enough to instantly exit the superconducting state.

Zhang Shuo listened for a long time before he asked, "In other words, we need a material with a high critical temperature and strong current carrying capacity?"

"Correct!"

Yu Fei said it very forcefully, and immediately explained, "There may be room for improvement in design, but whether considering cost, time, or other issues involved in the complex design itself, changing the material is the easiest."

"Haven't you asked those institutions or teams doing superconductivity research?" Zhang Shuo asked.

"None of them met expectations." Yu Fei said, "Even the laboratory materials have been checked, and most of them have problems with the bearing temperature."

"We found a copper-based material that barely meets the current carrying capacity requirements, but the critical temperature does not meet the requirements. It is 31K, which is too low."

Zhang Shuo immediately asked, "How high is the demand? Have you calculated it?"

"Above 60K. If the current carrying capacity is strong, it can be slightly lower, but not less than 50K."

"This request... is too high." Zhang Shuo said with a wry smile.

He is not an expert in the field of superconductivity, but he has some understanding of existing superconducting material technology.

The material requirements mentioned by Yu Fei are not enough individually, but when put together they are very extraordinary.

For example, the critical temperature is above 60K.

In recent years, there have been many breakthroughs in superconducting technology, and many superconducting materials with high critical temperatures have emerged.

60k is still relatively high, but it can find a lot of materials.

The demand for an upper limit on current carrying capacity is not excessive.

The two together make a difference.

Superconducting materials with high critical temperatures almost all have one common problem, which is poor current carrying capacity.

Superconducting materials with strong current carrying capacity have relatively poor critical temperatures.

This is why most new superconducting materials can only be kept in laboratories after they are developed.

Now the problem is obviously unsolvable.

After Zhang Shuo hung up the phone, he thought carefully about the material problem and finally decided to visit a superconducting research institute.

He chose the Academy of Sciences' Key Laboratory of Superconductivity.

……

The Academy of Sciences' Superconductivity Laboratory is located in the capital.

After making the decision, Zhang Shuo immediately contacted the Institute of Physics of the Chinese Academy of Sciences and then went directly to the capital.

The superconducting laboratory received the news in advance and a large group of people were waiting at the door.

Among them were several acquaintances, including Wang Lei and Gao Xiaopeng, whom I had met in meetings or projects.

The Superconducting Laboratory and the Chaos Force Field Experiment Group have cooperated, and they also sent a special team to participate in the work during the construction of the device and the experimental process.

Zhang Shuo was warmly received when he arrived.

A large group of people came towards him and then entered the laboratory for a tour.

It is called a laboratory, but in fact it is a headquarters building.

Zhang Shuo walked in front, followed by laboratory director Wang Lei and researcher Su Zhiguo.

Su Zhiguo and Zhang Shuo have known each other for a long time. When they were studying the fermion Hubbard model, they had communicated online and later met at a conference.

A group of people started talking along the way.

Su Zhiguo talked about the Fermion Hubbard model. Their team has been using the solution of the Fermion Hubbard model to explore the mechanism of electron movement in the superconducting state.

"This research gives us a better understanding of the mechanism of superconductivity."

"Electron motion is very important. Superconductivity is fundamentally about studying electron motion, and the calculation of the fermion Hubbard model can provide a detailed analysis of electron motion..."

Su Zhiguo said a lot of things in succession, and others followed suit.

In recent years, most of the research on superconductivity mechanisms has been focused on solving the fermion Hubbard model.

The solution to the fermion Hubbard model is also Zhang Shuo's research result.

This is tantamount to praising Zhang Shuo.

Zhang Shuo was also in a good mood after listening to this. After all, it was indeed his own research. Even if he didn't care about it at all, it did make him feel proud that a small research could guide the research direction of an entire discipline.

He did not indulge in flattery. After a few pleasantries, he went straight to the purpose of his visit.

"The chaotic force field experiment requires a completely new type of measurement, which requires the use of superconducting technology to construct an independent strong magnetic field in a small area inside the device."

"The problem now is that we need a superconducting material with strong current carrying capacity and high critical temperature."

"I want to know about the laboratory materials here..."

After the needs were stated, the people in the superconducting laboratory discussed it and immediately put forward a person - Wen Shumao.

"Professor Wen is an absolute expert in superconducting material research!"

"In the past two years, Professor Wen's team has achieved remarkable results, with several new materials. One of the materials was even published in Nature magazine and has attracted international attention."

"Professor Wen has been researching this field, studying the mechanisms of unconventional superconductors and synthesizing high-temperature superconductors."

Wang Lei helped introduce Wen Shumao.

Wen Shumao is China's leading expert in superconducting materials.

His research area is superconducting materials and related physical problems. He uses various methods to study the mechanisms of new unconventional superconductors and flux state physics, etc.

After Zhang Shuo and Wen Shumao met, they discussed the demand for superconducting materials in detail.

Wen Shumao frowned, shook his head and said bluntly, "Academician Zhang, this requirement is too high." "There is no material that meets the requirements in our laboratory, or in the whole country."

He spoke with great certainty, and it was obvious that he was very knowledgeable in the field of superconducting materials.

After that, he explained, "Our team's latest achievement is very close to your needs, with a critical temperature of 68K, but the current carrying capacity is still a little worse."

"That's definitely not possible."

Zhang Shuo also shook his head directly, "Current carrying is a must."

"This……"

Wen Shumao didn't know what to do for a moment.

Zhang Shuo said, "Professor Wen, let's go to your office and tell me in detail what kind of materials you have so I can understand them, okay?"

"Of course, of course!"

Wen Shumao immediately stood up and stretched out his hand as a "please" gesture.

Zhang Shuo went to the office with him.

Wang Lei, Su Zhiguo and others all did their own things.

Although he couldn't find suitable materials, Zhang Shuo still looked relaxed.

He had no hope in the first place.

If there were suitable materials, Yu Fei's team would have found them long ago. He came here to find a suitable material and use it as a basis for research.

He came with the mentality of giving it a try.

If we can develop suitable superconducting materials based on a certain material, we will be able to meet the needs of the chaos force field experimental team.

If it can't be solved, think of other ways.

In fact, as Yu Fei said, if suitable superconducting materials cannot be found, modifications to the technical design can solve some of the problems, but it will make the design more complicated, take a long time and cost more money.

Replacing superconducting materials is the simplest, most direct and effective way.

……

Once we got to the office, Wen Shumao used the computer to explain various operating materials.

Some material is just briefly mentioned.

Some materials with high critical temperatures will be introduced in detail, especially those "proud works", including the latest research published in Nature magazine.

It can be seen from Wen Shumao's introduction that he and other team members pay more attention to the critical temperature of the material.

In the field of superconducting materials, critical temperature is indeed very important. If the critical temperature of the material is not high, it can hardly be considered a great achievement.

Some materials have a lot of shortcomings and are not practical at all, but if their critical temperature is high, they will be considered a technological breakthrough.

Zhang Shuo listened very patiently and gained a basic understanding of each material.

Most of the materials did not meet the requirements, but he did not interrupt Wen Shumao, but continued to listen patiently, because he did not know much about superconducting materials, especially when it came to in-depth mechanisms and manufacturing, which could be said to be completely blank.

Wen Shumao's introduction was very detailed, which allowed him to understand more.

A few more pictures flashed across the computer screen. They were a type of superconducting material called the "122 system," a research result from more than a decade ago.

Wen Shumao obviously didn't care. He just said a few simple words and then prepared to introduce the next one.

"Let's talk about this more."

Zhang Shuo suddenly said something, and then said, "This material has a strong current carrying capacity. It is related to the system it belongs to, right?"

"That statement... is also correct."

Wen Shumao hesitated for a moment, then nodded and said, "Superconducting materials are divided into several systems. Among them, the '122 system' materials generally have a stronger current carrying capacity."

"There are several main reasons. On the one hand, its intrinsic properties such as crystal structure and electronic state are conducive to the transmission of electrons and can form a higher superconducting current."

"In addition, it is also related to the improvement of preparation process technology. We have used technology to improve the density of materials and the connectivity of grains, etc., which can effectively improve the current carrying capacity of materials."

"However, the disadvantage of the 122 system material is also obvious, that is, the critical temperature is low."

"So far, the highest critical temperature of the 122 system materials we have studied is only 21K."

Wen Shumao kept shaking his head as he spoke.

The chaotic force field experiment requires superconducting materials with a critical superconductivity temperature of 60K.

The gap between 21K and 60k is too big!

Zhang Shuo nodded thoughtfully. He kept staring at the pictures on the computer and the chemical formula of the material. After a long while, he continued, "Can you introduce the detailed preparation method of this material?"

“I want to know everything about material preparation and the underlying theoretical mechanisms.”

Wen Shumao didn't expect Zhang Shuo to be interested in this kind of material. He looked up with some surprise, then looked at the computer screen again and asked as if to confirm, "This material... why?"

He wants to know the answer.

Zhang Shuo said, "The chemical equation is simple, the constituent elements are simple, and there is a lot of room for research expansion."

"Research?"

"Correct."

"What research?"

"Based on this material, I want to study superconducting materials that can be used in chaotic force field experiments."

"Forehead……"

Wen Shumao was stunned and didn't understand. He thought he had heard it wrong.

Researching superconducting materials?

Zhang Shuo?

Is there any connection between the two?

He was stunned for a long time before he reacted and continued, "To know the detailed information...I need to apply for it."

"Okay, I'll wait."

Zhang Shuo didn't care. Even if it was research from more than ten years ago, the underlying mechanisms of material development and preparation technology must be confidential information.

(End of this chapter)