Recent content by pangru

Hello, I am interested in physics of cuprate high temperature superconductors (Cuprate_SC) However, I heard that it is "out-of-dated" topic in solid state physics and almost impossible to find group/foundation to do research in this field. I am doing PhD right now and I consider moving...

I am not sure if a get question properly but, in general, particles temperature can be defined with its kinetic energy slow neutrons are colder, hot neutrons are faster.. as analogue of classical temperature, where $$ T \sim <E_k> $$

:smile: It is clear what acetone leaves something behind.. I wanted to understand the role of its evaporation rate It seem where are some other reasons why it is good to have IPA after, but evaporation rate is crucial point as well--- thank to all of you for quick and kind explanations...

That is a point :woot: maybe water can not dissolve acetone :rolleyes:

So, reason to use Isopropanol after Aceton is high evaporation rate of acetone, is it right? as I understood it is following:>> If I start drying(by Ni gas flow) sample just after acetone cleaning, aceton will evaporate so fast, before I remove by Ni gas-flow,that rinsed particles will...

In the semiconductor device fabrication procedures, common cleaning recipe includes Acetone and just after it, Isopropanol cleaning. My question is, Why do we need Isopropanol cleaning after acetone? As answers of this question says, Isopropanol must be used after acetone cleaning, due to...

do you exclude all other interaction?

do you mean this? >> degrees of freedom are frozen" at low T OK. .. and that does frozen degrees of freedom means? :D Imagine you are Einstein, How would explain this to your grandmother? :D

yes, something like that :smile: at low T, heat capacity is very low >> how this could be explained? without math :biggrin:

According to Einstein (or Debay) model of solids, heat capacity drops exponentially at low temperatures: question is >> why it changes so dramatically at low temperature that is physical explanation of this?

Homework Statement I have to shot 100(±5) to kill 50. how many shots I need to kill 1 bird? Homework EquationsThe Attempt at a Solution 100±5/50 = 2±0.1 this solution is so simple, I think it is not right - is it? :rolleyes:

dielectric constant (ε) of semiconductor can be changed by deposition on high (or low) ε substrate. ==> Dielectric confinement is effective reduction of the dielectric constant due to the penetration of electric field into barrier medium with a small dielectric constant. for further inf...

What is Dielectric confinement effect?. or could you advise me literature about this? Thank you.

Thank you ..

What does underdoped cuprates mean? As I guess cuprate is underdoped when hole concentration is less then optimal doping. Is it correct?...:rolleyes: Thank you very much in forward