（以下所有公开信件内容征得了 Jorge E. Hirsch 教授的同意。）
在我们的论文发布之后，Hirsch 立即发来了他的质疑 “I am somewhat confused by your results. It is not clear to me how you differentiate between real and not real superconducting transitions for this material. ”这个评论一针见血，这也是我们一直担心的问题，一直试图重复实验的原因。即为什么45K的零电阻信号不是假的零电阻信号？
在看了我们的回复之后，Hirsch 认同了我们的观点，并立即开始了相关的科研合作。
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Dear Jorge,
This is the real problem.
This experiment has lasted for a whole year.
We have only obtained a single batch of samples that have the 45K resistivity transition in paper1 last year, and never repeated.
Lots of the experiments show the 70K transitions which proved to be open-circuit in paper2.
So, are the two types of transitions same or not? Actually I cannot prove it now without samples.
There are only some differences in data curves:
1. The sample in paper1 is unstable, the signals lost after a week. While the paper2 samples are very stable and repeatable.
2. The resistivity behaviors look different. And the transition temperatures are different.
3. The small segment of negative resistance in paper1 is familiar to me. It happens sometimes in multi-phase samples when the superconducting channel is partly established, and disappears when the superconducting channel is fully established.
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Dear Zhi An,
Thank you for the clarification.
I certainly could imagine that there is superconductivity above 40K in a material with the composition you are studying, provided the Se ions are sufficiently close to each other. Do you have a picture of the structure and do you know the distance between Se ions?
Best regards,
Jorge
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