Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-24
J. Phys. Soc. Jpn. 74 (2005) 2157
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures (2 color figures)
Scientific paper
10.1143/JPSJ.74.2157
A criterion for effective irrelevancy of the spin-orbit coupling in the heavy-fermion superconductivity is discussed on the basis of the impurity Anderson model with two sets of Kramers doublets. Using Wilson's numerical renormalization-group method, we demonstrate a formation of the quasiparticle as well as the renormalization of the rotational symmetry-breaking interaction in the lower Kramers doublet (quasispin) space. A comparison with the quasispin conserving interaction exhibits the effective irrelevancy of the symmetry-breaking interaction for the splitting of two doublets Delta larger than the characteristic energy of the local spin fluctuation T_K. The formula for the ratio of two interactions is also determined.
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