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Physics
Atomic and Condensed Matter
Exploring the Role of Spin in the Kondo Effect
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[QUOTE="Dr_Nate, post: 6318701, member: 670127"] If you add a term to your Hamiltonian it's going to change things. If you keep more orders in your perturbation expansion it's going to change things. The question is: what changes and how much? Usually, theorists assume the next term in an expansion is smaller than the last. Not so with the Kondo effect at low temperature. Read the paragraph above and below equation 1 [URL='http://www.scholarpedia.org/article/Kondo_effect']here[/URL]. Pay particular attention when they talk about higher-order corrections. I'm not a theorist and did not read the pdf closely, but the three Kondo Hamiltonian's in Eq. 1 (or 2) and Eq. 7 and Eq. 35 [URL='https://www.cond-mat.de/events/correl15/manuscripts/nevidomskyy.pdf']here[/URL] look different, so the models will be slightly different. As for others' interpretations of models, I'm always skeptical. For example, some authors are fond of talking about electron hopping from lattice site to lattice site (theorist often ignore the atomic basis, but not always) in certain systems. I find that they are talking about overlap integrals. I think electron hopping in those cases are as wrong a description in solids as the Bohr model is in atoms. But that's just my opinion, and you should be skeptical of it too, until you decide for yourself. ;) [/QUOTE]
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Exploring the Role of Spin in the Kondo Effect
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