Dear Collegues,

I send you this email  because after a long search in the web I cannot found
an answer to a couple of questions:

first, I have a very thin ( 100 nm) Nb films and I would like to know what
is the best way for take off the oxide ( NbOx ? ) layer on my sample, I have
been suggested to try Hf but in some publication I have found It is stated
that the Nb will be damaged if I will use Hf...
Does someone know a better way to "clean" from oxide those samples ? ( so I
will be able to measure easily the Tc )

second, I would like to know ( and same story I have try to look in the week
but I couldn't found answer to my questions  ) the diffusion coefficients of
Nb atoms in the Au and of Au atoms in Nb, possibly at T=300, 400, 500, 600 C

I hope I do not ask too much and also that someone has some answers, peraphs
only partials  to my questions and that he will found the time to answer to
those questions if he know something about

Thanks in advance

cheers

Giuseppe Tettamanzi