Roles of Multipoles and Excitons in Superconductor PrOs_4Sb_<12> with T_h Symmetry(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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A possibility of exciton-mediated mechanism is studied to describe the superconductivity in a Pr skutterudite PrOs_4Sb_<12>. In this compound the low-lying crystal-field states of Pr form a pseudo-quartet consisting of Г_1 singlet ground and Г^<(2)>_4 triplet excited states. The dispersive crystal-field excitations (excitons) have been detected experimentally. The conduction electrons couple both magnetically and nonmagnetically with the pseudo-quartet. Believing that this coupling should be crucial for various properties of PrOs_4Sb_<12>, we determine the effective interaction between conduction electrons and the Pr pseudo-quartet states. It turns out that the nature of exchange processes is related closely to a_u and t_u components of the conduction electrons that correspond to the molecular orbitals of an Sb_<12> cage surrounding a Pr ion. By the second-order perturbation in the exchange coupling, Cooper pairing interactions are derived both for singlet and triplet superconductivities. First, they are classified with cubic point-group (O_h) bases. Then, the T_h symmetry, which is a unique feature of the filled skutterudite compounds, is taken into account; it is shown that the gap functions in different O_h representations are mixed due to the T_h symmetry. The T_h symmetry in which no fourfold symmetry is present shows up in the gap functions within a weak coupling theory. As a candidate for the superconductivity in PrOs_4Sb_<12>, we propose a nonunitary triplet state with twofold symmetry which agrees most naturally with the gap structure observed in the low field phase. We also find that the triplet superconducting state becomes possible owing to the T_h crystal-field symmetry.
- 社団法人日本物理学会の論文
- 2006-01-15
著者
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SHIBA Hiroyuki
The Institute of Pure and Applied Physics
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MATSUMOTO Masashige
Department of Physics, Shizuoka University
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KOGA Mikito
Department of Education, Shizuoka University
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Koga Mikito
Department Of Education Shizuoka University
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Matsumoto Masashige
Department Of Physics Faculty Of Science Shizuoka University
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Shiba Hiroyuki
The Institute For Solid State Physics The University Of Tokyo
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