Physics – Condensed Matter – Superconductivity
Scientific paper
2003-02-15
J. Phys.: Condens. Matter, Vol.15 (2003) L275-L284
Physics
Condensed Matter
Superconductivity
12 pages, 2 figures, submitted to J. Phys.: Condens. Matter Letter
Scientific paper
10.1088/0953-8984/15/19/102
It is shown that unconventional nature of superconducting state of PrOs_4Sb_12, a Pr-based heavy electron compound with the filled-Skutterudite structure, can be explained in a unified way by taking into account the structure of the crystalline-electric-field (CEF) level, the shape of the Fermi surface determined by the band structure calculation, and a picture of the quasiparticles in f$^{2}$-configuration with magnetically singlet CEF ground state. Possible types of pairing are narrowed down by consulting recent experimental results. In particular, the chiral "p"-wave states such as p_x+ip_y is favoured under the magnetic field due to the orbital Zeeman effect, while the "p"-wave states with two-fold symmetery such as p_x can be stabilized by a feedback effect without the magnetic field. It is also discussed that the double superconducting transition without the magnetic field is possible due to the spin-orbit coupling of the "triplet" Cooper pairs in the chiral state.
Harima Hisatomo
Kohno Hirohiko
Miyake Katsuya
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