Exciton mediated superconductivity in PrOs4Sb12
Exciton mediated superconductivity in PrOs4Sb12
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DOI：
10.1143/jpsj.73.1135
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发表时间：
2004-05-01
影响因子：
1.7
通讯作者：
Koga, M
中科院分区：
文献类型：
--
作者：
Matsumoto, M;Koga, M
奇异超导体PrOs_4Sb_（12）最重要的特征是存在有限能隙的低激发态（激子），在4.5T以上表现为磁场诱导的有序。我们关注的是a（u）导带，它与Pr 4f（2）态强烈杂交，与激子耦合。它导致传导电子之间的吸引相互作用。超导序参量的对称性由激子的色散关系决定。对于体心立方系统PrOs 4Sb 12，d波态（k（x）k（y）+ ω k（y）k（z）+ ω（2）k（z）k（x），ω（2）k（z）k（x），ω = e（+/-i2 pi/3））被时间反演对称性破缺稳定。
The most important character of the exotic superconductor PrOs4Sb12 is the existence of low-lying excitations (excitons) with a finite energy gap and it appears as the magnetic field-induced order above 4.5 T. We focus on the a(u) conduction band, which hybridizes with a Pr 4f(2) state strongly, coupled to the excitons. It results in an attractive interaction between the conduction electrons. The symmetry of the superconducting order parameter is determined by dispersion relation of the exciton. For the bcc system PrOs4Sb12, a d-wave state (k(x)k(y) + omegak(y)k(z) + omega(2)k(z)k(x), omega(2)k(z)k(x), omega = e(+/-i2pi/3)) is stabilized with broken time reversal symmetry.