Starting from a top student and marching towards the sea of ​​stars

Chapter 136 The Experiment Failed?
In this formula, △(k) and △(k') respectively represent the energy gap sizes at the wavevectors k and k' before and after scattering of electrons participating in paired scattering. Vk and k' represent the electron pair scattering process. of scattering matrix elements.

"For pairing caused by the interaction between electrons, Vk, k' must be positive values, so △(k) and △(k') must also have opposite signs...that is to say, the momentum position of the electron before and after pairing scattering The sign of the energy gap must be opposite..."

After constant analysis, Ning Chen calculated whether various materials in this system have superconducting properties and the possible critical temperature of superconducting.

After some analysis, Ning Chen quickly selected an ideal superconducting structure.

"The theoretical critical temperature of superconducting is 55K... If it can really be realized, this temperature will already be a new record for iron-based superconductors."

Having determined the new experimental direction, Ning Chen is already looking forward to future experiments.

……

In the following days, Ning Chen continued to follow this idea and conduct research on iron-based superconductivity.

This new substance was not easy to synthesize, so Ning Chen maintained a relatively calm attitude. After all, his previous project had gone very smoothly, and it was normal to encounter some obstacles.

After dinner, Ning Chen saw the message sent by Song Xiyun.

"Ning Chen, after buying new running shoes, have you tried running?"

After seeing the message sent by Song Xiyun, Ning Chen realized that the night running project he had promised to Song Xiyun had been delayed again accidentally.

"A test run tonight, or the same time?"

"Well, that's settled then."

Ning Chen knows that scientific research is a very long road, and if he wants to achieve more results, he must not just settle for one day.

Many outstanding scientific researchers also maintain very regular exercise habits. This allows them to have strong enough physical fitness to maintain daily high-intensity research work.

Ning Chen naturally wants to continue his scientific research work. Even if he is old, Ning Chen also hopes that he can continue to stick to his scientific research position, instead of just fishing and playing cards every day, living a very relaxed but empty life. life.

At nine o'clock in the evening, Ning Chen came to the playground on time, put on his headphones, and dialed Song Xiyun's number.

Prior to this, Ning Chen had already purchased a 3000-minute national call package per month in advance to ensure that he could always be in contact with Song Xiyun while running.

In less than two seconds, the other side of the phone was connected.

"Song Xiyun, I've arrived at the playground, where are you?"

"I'm here too, shall we start now?"

"Well, let's get started."

After Ning Chen gave the start signal, Ning Chen and Song Xiyun started running from their respective playgrounds at the same time.

Although the distance between the two people was 700 kilometers at this time, because they could feel each other's presence through the headphones, they both felt as if the other person was right next to them.

At the beginning, Ning Chen was not in good physical condition because he had not run for a while.

But as he ran, Ning Chen's body gradually began to adapt to the intensity.

Not sure if it was because of running at night with Song Xiyun in this way, Ning Chen felt that his body was full of strength.

Ning Chen got back the feeling he had when running every night at Shuimu University.

"Ning Chen, how many laps have you run over there?"

"It's almost 10 laps, how about you?"

"Not bad, I just finished 10 laps."

Although the two of them were not sure how far the other had run, neither of them had any doubts about the other.

At this time, Ning Chen felt that his physical strength was almost at its limit, but he gritted his teeth and persisted in running the last two and a half laps.

"Huh~ I finally finished my run."

After running 5000 meters, Ning Chen's whole body was soaked with sweat.

But the feeling of sweating heartily after exercise is really very comfortable, and even some of the depression accumulated in daily scientific research work is completely released.

Ning Chen looked at the time and found that it took him 5000 minutes to run 25 meters this time.

Compared to when he was at his peak at Shuimu University, this speed is still a bit slower.

"Ning Chen, can't you do this? I ran a little slower on purpose. It seems that you really haven't exercised these days." Ning Chen knew that Song Xiyun's words were true. If Song Xiyun ran with all his strength, he would at least be able to The time is shortened by another 1 minute.

"Hey, my speed is pretty good, very close to the level of a national third-level athlete."

"You're just a national third-level athlete? You're still far away."

"She's a female athlete, haha." Ning Chen said with a smile.

In fact, Ning Chen feels that if she can reach the standard of a women's national third-level athlete, she will be very good.

After the two ran 5000 meters, they did not leave the playground immediately. Instead, they walked around the playground for a while and chatted on the phone.

Whether it was mathematics, life, or various other topics, Ning Chen felt that he and Song Xiyun could chat very well. Perhaps this was a sign that the two had similar views.

"Ning Chen, is your phone bill still enough?"

Song Xiyun noticed that the call between the two lasted for more than half an hour, and it was still a call outside the province.

During this period, call charges were still very expensive, and the price of call charges was divided into within the city, within the province, outside the city, outside the province, etc., and the price was not unified.

"Don't worry, I just signed up for a nationwide calling package with 3000 minutes per month. It's no problem to make 100 minutes of calls every day."

"Oh my god, you are exaggerating. 100 minutes a day is enough to run a half marathon."

The two of them walked and talked on the phone like this. It wasn't until Song Xiyun returned to the dormitory that Ning Chen hung up the phone.

After returning home, Ning Chen took a shower, changed clothes, and then continued to the study to do research.

Whether it was the effect of exercise or chatting with Song Xiyun, Ning Chen felt that his condition was better now than before running.

Ning Chen felt that perhaps these two reasons were both, and it seemed that this activity should continue.

……

Time passed day by day, and Ning Chen maintained such a regular life every day, enjoying the fun brought to him by research and exercise.

Except for the occasional bad weather, Ning Chen and Song Xiyun would come to the playground every night and go for night runs on time.

Even if she was not feeling well for a few days, Song Xiyun would come to the playground and take a walk. In this way, she could accompany Ning Chen on her night run.

On this day, Ning Chen received good news during the experiment.

After continuous improvement, Ning Chen finally succeeded in synthesizing an ideal substance. This substance was exactly the kind of substance whose theoretical superconducting temperature reached 55K according to Ning Chen's previous calculations.

Once this superconducting critical temperature is confirmed, Ning Chen will set a record for the superconducting critical temperature of iron-based superconductors.

"Teacher Xu, I'm going to the measurement center."

"Ning Chen, have you finally successfully synthesized it?" Xu Zhou asked.

"Yes, Teacher Xu. This time I used an ultra-high pressure synthesis method. Through X-ray diffraction and scanning electron microscope measurements, I confirmed that this material is indeed the material I had dreamed of before."

"Well, then go and measure it quickly. I'll wait for your good news."

With the prepared samples, Ning Chen came to the measurement center, a laboratory specializing in superconducting temperature measurements.

Ning Chen was already very familiar with this experiment. He quickly adjusted the experimental environment and started the cooling process.

This time, when the measurement environment temperature was reduced to about 70K, Ning Chen began to slow down the temperature reduction so that he could record the experimental phenomena more accurately.

Ning Chen stared at the resistance display on the screen seriously, looking forward to the sharp change in the resistance display.

But this time, until the test environment temperature had dropped to 60K, the situation Ning Chen expected still did not happen.

At this time, Ning Chen felt a little disappointed, because this meant that there might be some problems with his previous theory.

However, this was also a very normal thing. Ning Chen immediately adjusted his emotions and continued the measurement work of the experiment.

No matter what the superconducting critical temperature of this material is, or whether this material is a superconductor, Ning Chen will accept these results calmly.

Even if it fails, so what? The worst thing is to go back and analyze the reasons and continue the research.

But when the test environment temperature dropped to 55K, Ning Chen suddenly saw that the resistance measurement data on the screen began to change dramatically.

(End of this chapter)