On the third day after receiving the Guo Award, Wu Bin ushered in his graduation defense.

In the defense room, Wu Bin is describing the thesis he has written.

"As mentioned above, the current maximum transition temperature of iron-based superconductivity has been able to reach 55K, breaking through the McClain limit of 39K, and has entered the range of superthermal problems, although there are still shortcomings, but ......"

Hearing this, Academician Chen Xianhui, who had been sitting there quietly, suddenly asked: "Then how much do you think iron-based superconductivity will be promising when the temperature exceeds it?" ”

Wu Bin, who was about to put the PPT down, was stunned for a moment, thought for a while and replied: "At the very least, it must exceed the liquid nitrogen temperature of 77K." ”

Chen Xianhui nodded after listening, moved a chair to his side, patted it and said: "Come and sit down, I have already read your paper, in fact, it is very well written, and I believe that your level does not need me to do any more verification, I want to hear your understanding and knowledge of superconductivity now." ”

"This ......" Wu Bin scratched his hair, "I'm just getting started in superconductivity, and I really feel a little bottomless when I talk about understanding in front of Professor Chen." ”

You must know that the current leading position in iron-based superconductivity in China is Professor Chen Xianhui's group, which can definitely be said to be in the grandmaster sector.

"Haha." Chen Xianhui laughed twice, "Don't be nervous, just say what you think." ”

"Okay, then since Professor Chen said so, I'll try." After speaking, Wu Bin sat next to Chen Xianhui, "In fact, after consulting a large number of papers on high-temperature superconductivity, what I am most puzzled about is what the specific mechanism of high-temperature superconductivity is. ”

Chen Xianhui nodded, "That's right, because there are many complex phase diagrams such as charge density waves, spin density waves, and long-range ferromagnetic antiferromagnetic superstructures in high-temperature superconductivity, so the study of its mechanism has always been very difficult, so this is not just your doubt, but the doubt of the entire academic community." ”

Hearing this, Wu Bin suddenly stood up and walked to the blackboard and wrote [SmFeAsO1-xFx] and [Ba1-xKxFe2As2] in chalk

"I read one of your papers before, which describes the change of superconducting critical temperature and spin density wave transition temperature in these two systems through the conversion of oxygen and iron, and I found that the oxygen isotope effect of the boundary temperature is very small, but the iron isotope effect is very large."

"What's even more amazing is that the isotope exchange in this system has the same effect on the critical temperature and the spin density wave transition temperature, does this indicate that the electron-phonon interaction plays a role in superconductivity in this system?"

"Hahaha." Chen Xianhui suddenly laughed loudly after listening to Wu Bin's question, "No wonder Professor Liu took special care of me and told me not to believe what you said, I just know a little bit, I don't understand much of this kind of thing." ”

"Being able to ask this question shows that you are not at all interested in superconductivity, as you say, but just getting started."

"Huh? Is that what Professor Liu said about me? Wu Bin's expression was slightly embarrassed, these days, he will be hacked if he speaks carefully.

Looking at Wu Bin's embarrassed expression, Academician Chen Xianhui waved his hand and said: "It's a good thing to be in awe in the face of knowledge, those who like to talk full of words are the ones who really don't understand, I hate to appreciate your quality." ”

"Thank you, Professor Chen, for the compliment."

"As for the question you just raised, this is not just a simple electro-phonon interaction mechanism, there may also be a coupling ...... spin and phonon."

Speaking of the rise, Professor Chen Xianhui also walked to the blackboard, picked up chalk and began to draw a relationship diagram.

……

Outside the defense room, Jin Yunxia was waiting anxiously, grabbing Wu Shiqiang beside her from time to time and whispering: "Why hasn't this come out yet, didn't my son just say that it won't take much time?" Is there something wrong? ”

Because Director Jiang told Wu Bin that as soon as his graduation defense was over, the school would help him hold a one-person graduation ceremony, so Wu Bin simply asked his parents to stay next to the school for two days and go back after attending the graduation ceremony.

And Jin Yunxia said that she would come together after hearing the news that Wu Bin was going to graduate today, so she waited at the door of the defense room.

After hearing this, Wu Shiqiang patted her on the back and said, "Oh, don't worry, your son will be fine if he says it's okay, just believe him." ”

"That's what you say...... But it's also been too long. ”

At this time, Li Yan, who was also waiting on the side, said with a smile: "Don't worry, Auntie, this kind of thing is the defense, it can only mean that they have to talk a lot after a long time, and the defense tutor will not want to talk to them a lot for students who are not satisfied." ”

After hearing this, Jin Yunxia patted her chest and said, "Then I'll be relieved, thank you, little classmate, I remember your name is ...... Li Yan, right? ”

"Yes, it's me." Li Yan nodded.

"Thank you for taking such good care of my son at school, and for waiting for him to defend."

"Auntie, it's your son who takes care of me, he has helped me too much, I'm his follower."

"Ouch, you can't say that, it's right for classmates to help each other, and there's nothing to follow." Jin Yunxia smiled and waved her hand, then looked at Lin Ziqi, who was standing beside Li Yan and had not spoken, and said, "Auntie doesn't have a good memory, have we met this classmate anywhere?" ”

Lin Ziqi, who was asked, immediately stood up straight and nodded, "Hmm! Last time I came to see Wu Bin during the summer vacation, we met in front of the library. ”

"Oh~~ yes, I remember." Jin Yunxia patted her forehead: "Look at my memory, but you don't seem to be the same as you were then?" ”

Lin Ziqi lowered her head after hearing this and said, "Probably because I was wearing glasses at that time." ”

"Yes, yes, yes." After speaking, Jin Yunxia approached Lin Ziqi and looked at her: "It's better not to wear glasses, what a good-looking little girl." ”

"Thank you...... Thank you Auntie. Lin Ziqi thanked with a red face.

"Thank you for coming to wait for Wu Bin, I am relieved to know that he has so many friends at school."

Lin Ziqi hurriedly waved her hand and said, "No thanks, no thanks." ”

And just when Jin Yunxia wanted to ask something, the door of the defense room suddenly opened, and Wu Bin and Professor Chen Xianhui walked out of it together.

Looking at the few people waiting outside the door, Wu Bin said with a smile: "Everyone, I have graduated." ”

At this time, Jin Yunxia's hanging heart was completely put down, and she went up excitedly to hug Wu Bin, and then bowed to Professor Chen Xianhui again and again: "Thank you, teacher, thank you." ”

Chen Xianhui hurriedly hugged Jin Yunxia and said, "Don't thank me, your son is very good, and it is his own ability to pass the defense, and it has nothing to do with me." ”

"Thank you, thank you." Jin Yunxia nodded even more happily.

PS: I found out that it was exactly the 300th chapter~ Scattering flowers