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## Main Question or Discussion Point

I am no familiar with this area, and I want to know whether can we say that materials including atoms with d electrons are strongly correltated sysytem?

- Thread starter leoant
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I am no familiar with this area, and I want to know whether can we say that materials including atoms with d electrons are strongly correltated sysytem?

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You do know that you're asking a question that is the topic of whole books.leoant said:I am no familiar with this area, and I want to know whether can we say that materials including atoms with d electrons are strongly correltated sysytem?

The term "strongly correlated" is often a vague term. More often than not, it is reflected in the ratio of t/U, or W/U, where t is the hopping integral, U is the on-site Coulomb repulsion, and W is the bandwidth. If you have done tight-binding approximation, you would have noticed that the s-orbital tends to be highly localized around the ions. Compare this to the d-orbital that is more spread out, and you can see why transition atoms and oxides will create more

One of the most important classifications in strongly correlated electron system is the Zaanen-Sawatzky-Allen scheme[1]. This scheme tries to delineate between a Mott-Hubbard system and a charge-transfer system in the transition metal/oxides. You may want to read on this also.

Zz.

[1] J. Zaanen, et al. Phys. Rev. Lett. v.55, p.418 (1985).

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http://arxiv.org/abs/cond-mat/0508631

Caveat: I did only a quick glance at this preprint, so I cannot vouch for its accuracy (it looked good on that quick glance). I seldom recommend preprints on Arxiv based on a flimsy review such as this, but I'm pressed for time right now (have to complete as much stuff this week as possible before my Disney World vacation).

Zz.

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Thank you very much, dear Zapperz. And May you a good journey.

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http://arxiv.org/abs/cond-mat/0509041

Zz.

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Using Hubbard mode or t-J mode? Or even chaos theory?

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But that is a central research work in condensed matter. What model one can use it extremely important. One model that works in one situation may not work in another. It very much depends on the nature of the problem. If you have, for example, a Kondo system, then even perturbative approach may fail since for this system, one of the higher order interaction is LARGE.leoant said:

Using Hubbard mode or t-J mode? Or even chaos theory?

Zz.

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