Hello Sandeep,
A negative value of U for instance occurs in Ge.
I was given this article before to explain this behavior:
http://www.sbfisica.org.br/bjp/files/v36_286.pdf
Note that the effective U = U-J.
Best regards,
Michael Sluydts
sandeep schreef op 8/07/2015 om 18:49:
Dear users!
It may not be appropriate to post this question here,
"Did any one encounter negative value of U in solids (compounds) ? if
so explain its origin and quote related concepts. Kindly explain the
origin and experimental supports if any?"
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ir. Michael Sluydts
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