Great Country Academician

Half an hour is not a long time, at least for the three people who got the paper at this moment.

This level of paper is fatally attractive to any scholar or researcher in the relevant field.

It was not until Xu Chuan spoke that the three people reluctantly moved their eyes away from the "Condensed Matter Electron Localization Structure Theory" in their hands.

"Academician Xu, did you write this theory?"

Taking a deep breath, Song Wenbo looked at Xu Chuan with a burning gaze and couldn't help asking.

Hearing this question, Fan Pengyue and Gong Zheng in the office also quickly cast their eyes over.

This sounds like a nonsense question, but it is crucial.

If the paper is written by the person in front of him, then the feasibility of it becoming a mechanism for room temperature superconducting materials is undoubtedly huge.

And it is also very likely to complete the research and development of room temperature superconducting materials based on it.

But if it is written by someone else, you have to consider whether the paper is correct.

After all, not everyone is called "Xu Chuan".

On the sofa, Xu Chuan smiled and nodded, saying, "I wrote the paper myself."

Hearing this affirmative answer, the three people's faces were somewhat uncontrollably excited and excited.

With this person's personality, he would not make his research results public unless he was extremely sure.

Although it is not public now, he chose to bring out the theory, which also means that he is optimistic about this paper.

This is the research on room-temperature superconducting materials! It is no exaggeration to say that it can really change the whole world like controlled nuclear fusion technology!

With a smile, Xu Chuan continued: "The next task of the superconducting materials research department is room temperature superconducting materials. The research direction is aimed at copper oxide-based materials, focusing on the lattice structure reset of the core substrate, and the doping experiments of ds zone elements such as silver, carbon, and gold."

"In the initial stage, Song Wenbo, Gong Zheng, and I are responsible for the research of experiments in different directions."

"The collected experimental data will be processed by Fan Pengyue, including the calculation work of the material calculation model."

"As for now, I will explain this theoretical paper to you first, and try to understand these things as quickly as possible."

Hearing Xu Chuan's instructions, the three nodded synchronously and took on their own tasks.

Generally speaking, the starting point of a new material research and development is physical research.

Because this involves an in-depth understanding of the basic properties and behaviors of the material.

The work at this stage may include research on the structure, performance, and how they interact with each other of the material.

However, Xu Chuan has already done this stage. The theory of localized electron construction in condensed matter contains the mechanism speculation of room temperature superconducting materials and how to construct local electronic lattice structures.

After handling the theoretical design, the next step is naturally the material design stage.

Based on the results of theoretical research, researchers will consider how to improve or innovate the performance of materials, which may involve the composition, structure and possible processing methods of new materials.

This is where experimental data is accumulated.

By using various technologies and processes, such as template method, sol-gel method, etc., to ensure that the material can be manufactured according to the design requirements.

Summarizing experimental data and related experience in continuous trial and error, and finding a way to the end is the only way for all materials science experiments.

This step, if it is a smaller research institute or experimental institution, is generally carried out by manpower.

Larger research institutes or enterprises will establish corresponding mathematical tools or models in a targeted manner. By feeding experimental data into the corresponding tools, computers can quickly complete the work that originally required a lot of manpower and time.

The material calculation model developed by Xu Chuan has similar functions.

In other words, based on similar functions, he has upgraded it in a targeted manner, and can use the model to find possible synthesis routes while processing data.

The research work on room temperature superconducting materials is progressing steadily and orderly.

Although he had a complete method for preparing copper oxide-based chromium-silver superconducting materials in his mind, Xu Chuan did not choose to directly produce room-temperature superconducting materials on the first day of research.

On the one hand, it was because this was not in line with common sense.

There were some lucky people in the process of material research, but it was too lucky to be so lucky.

On the other hand, it was natural to collect relevant experimental data.

Don't forget that copper oxide-based chromium-silver room-temperature superconducting materials are defective. The purpose of developing room-temperature superconducting materials this time is not simply to reproduce the research results of the previous life, but to find a way to optimize on the original basis.

This is the purpose.

The research on room-temperature superconducting materials has entered the right track, and Xu Chuan is not in a hurry. He goes to the Chuanhai Materials Research Institute for the first four days of the week, and the last three days are assigned to other work.

For people like him, the nine-to-five days can even be regarded as a rest to some extent.

After all, many times, once he gets into a certain problem or a certain scientific research project, staying up late and working hard is a common thing.

"Professor."

In the office of Nanjing University, someone knocked on the door gently and shouted.

Hearing the voice, Xu Chuan looked up, and when he saw the person coming, he stood up and greeted them with a smile: "Why are you here?"

The person who came was his student, Gu Bing, followed by a girl, Gu Bing's girlfriend, Jiang Zi. When the two confirmed their relationship, Gu Bing brought her to meet him.

Gu Bing smiled and glanced at his girlfriend.

Jiang Zi nodded, let go of Gu Bing's hand, walked forward, handed the invitation in his hand to Xu Chuan with both hands, and said with a smile on his face: "Professor, Gu Bing and I are here to give you an invitation."

Xu Chuan's eyes fell on Jiang Zi, and he realized something. He smiled and took the invitation and asked: "Is it a wedding invitation?"

At first glance, the front of the big red invitation was printed with red double happiness in gold flowing lacquer, and there was a heart-shaped pattern on the back of the opening.

As he expected, it was his student's wedding invitation.

Gu Bing held his girlfriend's hand, with a sweet smile on his face, nodded and said: "Yes, Professor, I am going to marry Xiaozi."

Xu Chuan smiled and blessed: "Congratulations! Has the time been decided? When?"

Gu Bing was one of his first students. He was 25 years old when he accepted him. Seven years later, he is now 33 years old.

Getting married at this age is definitely late for ordinary people, but for scientific researchers, although it is also a bit late to get married at this age, it is also within the normal range.

After all, in China, the average age of doctoral graduates is about 33 years old.

He has met Gu Bing's partner, a girl from Sichuan, who is five or six years younger than Gu Bing. The two have been together for almost a year.

Calculating the time, if everything goes well, it is about time to get married.

Gu Bing smiled and said, "The time has been set. It will be on New Year's Day, which is one month later. The address is at the Greenland InterContinental Hotel."

Xu Chuan smiled and nodded, opened the invitation and took a look, and smiled and said, "I will arrange the time in advance and will definitely attend on time."

Hearing this, Gu Bing's face suddenly put on a bright smile.

Among all the invited guests, apart from the parents of both parties, Xu Chuan is undoubtedly the most important one.

"Um, professor, I have something else I want to ask you for help."

After delivering the invitation, Gu Bing touched his head and said a little embarrassedly.

Xu Chuan smiled and asked, "What's wrong?"

Gu Bing smiled shyly and said, "Um, professor, I want you to be my witness."

"Witness?" Hearing this, Xu Chuan was stunned for a moment, then smiled and said, "No problem, it's a small matter."

Gu Bing smiled and said, "Then I'll trouble you, professor."

After chatting for a while, Gu Bing left with his girlfriend. Xu Chuan had a smile on his face, and his eyes fell on the red invitation on the table, feeling a little emotional.

First there was Lin Feng's daughter's full moon banquet, and then there was Gu Bing's wedding banquet.

Unconsciously, his friends and students who were about the same age as him seemed to have begun to move towards another stage of life.

Smiling and shaking his head, Xu Chuan put away the invitation. This student was thoughtful to send him the invitation a month in advance.

Before that, it would be better to solve the research on room-temperature superconducting materials.

After all, research and development, or replicating copper oxide-based chromium-silver room-temperature superconducting materials, is not difficult, but the subsequent optimization is difficult.

After New Year's Day, he might have to devote his energy to other fields.

Days passed one by one, and Xu Chuan's daily life was basically a three-point line.

Nanjing University, Sichuan Institute of Materials, Xinghai Research Institute, and the villa at the foot of Purple Mountain.

The research and development of room-temperature superconducting materials occupied his main energy. As for going to Nanjing University to teach students and presiding over daily work at Xinghai Research Institute, he basically only chose one place a day.

In nearly a month, the research on room-temperature superconducting materials has advanced a considerable distance.

He, Song Wenbo and Gong Zheng each led a team to conduct research in different directions and collect experimental data.

On December 24, the day before Christmas, it rained heavily in the deep winter, and the sky was overcast.

In the laboratory of the Sichuan-Hai Institute of Materials, Xu Chuan, wearing a white coat, a protective mask and goggles, put the materials in his hands into the electron beam evaporation coating machine.

Since it has been decided to complete the research and development of room temperature superconducting materials before Gu Bing gets married, it is necessary to leave a few days for preliminary verification.

Christmas Eve is a good day. According to the process in memory, Xu Chuan has started the synthesis of copper oxide-based chromium-silver room temperature superconducting materials.

For him, even if he has not personally synthesized copper oxide-based chromium-silver superconducting materials for more than ten years, the entire synthesis process is impossible to forget.

In fact, the core of room temperature superconductors is not to study the "doping" methods of other superconducting materials.

But in another direction.

That is, the delocalization of localized electrons, which is the so-called localized structure of condensed electrons.

In fact, in the history of human research on superconducting materials, doping can be said to be the most important means.

Take conductivity as an example, it is mainly determined by carrier concentration and mobility.

From the experience gained from the development of semiconductor chips and single silicon, to increase the carrier concentration, you have to rely on doping, or gate voltage injection, light injection, etc.

However, doping will inevitably lead to an increase in impurities and defects, and a decrease in mobility, so it is necessary to consider the balance and compromise between the two.

Searching for a superconducting material with such a matching structure and energy level like N-type doped phosphorus and silicon in semiconductors is something that almost all scholars in the field are doing.

Most superconducting materials were discovered in this way.

Appropriate doping will increase the critical temperature and critical current intensity of superconducting materials.

Whether it is low-temperature/high-temperature superconducting materials, whether it is copper oxide, or iron-based superconducting materials, these properties are improved by doping these basic materials with other elements during the development process.

However, people do not know which dopant in superconducting materials can achieve the level of perfect fit as the 'silicon doped with phosphorus' of semiconductors.

Therefore, the research approach to superconducting materials is exhaustive.

If you try the elements in the rows on the periodic table one by one, there will always be one or a few that can achieve the optimal match of structure and energy level.

However, materials science is a very complex field, the material world is also so complex, and dopants are far more than just elements.

Just like the A position of perovskite ABX3 has changed from the original atom to a more complex methylamine group, the idea is opened up immediately, and the complexity is certainly opened up.

At this time, research ideas that rely solely on exhaustive parameter scanning and heaps of manpower and material resources will obviously be insufficient when facing an infinite number of compound groups.

Perhaps AI and big data calculations will be a good solution in the future.

But condensed matter physics and strongly correlated electronic systems told Xu Chuan that there is actually another way here.

That is the localized electron delocalization of the material!

That is to say, try to keep local electrons as close to the Fermi surface as possible instead of being buried deeply in the inner layers of atoms.

As long as the electrons of the material can be stably brought near the Fermi surface, the current can be guided to the greatest extent.

How to build such a system is the real key to realizing room temperature superconducting materials.

As for the synthesis method, based on current technology, there is no doubt that it is nano-synthesis technology.

Only extremely fine nanomaterial synthesis technology can accurately control every area of ​​the material surface.

Copper oxide-based chromium-silver room temperature superconducting materials are synthesized through nanotechnology.

Under certain conditions, by fine-tuning the stacking and distortion of the surface of the copper oxide crystal layer, and then incorporating silver and chromium elements, the maximum supercurrent at the interface can be changed according to the direction of the current, and electronic control of the quantum state of the interface can be achieved. Reverse the polarity of the current to change the quantum state, thereby achieving superconductivity.

Unfortunately, it is still not a room temperature superconducting material in the 'narrow sense' and requires a certain external pressure to stabilize the electron delocalization of the Fermi surface.