Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-02
J. Phys. Soc. Jpn. 78, 123710 (2009).
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures. To appear in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.78.123710
A double-exchange mechanism for the emergence of ferromagnetism in cubic uranium compounds is proposed on the basis of a $j$-$j$ coupling scheme. The idea is {\it orbital-dependent duality} of $5f$ electrons concerning itinerant $\Gamma_8^-$ and localized $\Gamma_7^-$ states in the cubic structure. Since orbital degree of freedom is still active in the ferromagnetic phase, orbital-related quantum critical phenomenon is expected to appear. In fact, odd-parity p-wave pairing compatible with ferromagnetism is found in the vicinity of an orbital ordered phase. Furthermore, even-parity d-wave pairing with significant odd-frequency components is obtained. A possibility to observe such exotic superconductivity in manganites is also discussed briefly.
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