Orbital-controlled superconductivity in f-electron systems
Orbital-controlled superconductivity in f-electron systems
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DOI：
10.1143/jpsj.75.083702
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发表时间：
2006-08-01
影响因子：
1.7
通讯作者：
Hotta, Takashi
中科院分区：
文献类型：
--
作者：
Kubo, Katsunori;Hotta, Takashi
以CeMIn5(M=Co，Rh，Ir)为例，提出了轨道自由度控制的超导电性概念。用涨落交换近似分析了CeMIn5的微观多轨道模型。尽管费米表面结构不变，但在顺磁、反铁磁和d波超导相之间，基态发生了显著的变化，这取决于费米能量附近带内的主要轨道分量。通过仔细分析晶体电场状态，我们的图像自然地解释了CeMIn5的不同低温性质。
We propose a concept of superconductivity controlled by orbital degree of freedom taking CeMIn5 (M = Co, Rh, and Ir) as typical examples. A microscopic multiorbital model for CeMIn5 is analyzed by fluctuation exchange approximation. Even though the Fermi-surface structure is unchanged, the ground state is found to change significantly among paramagnetic, antiferromagnetic, and d-wave superconducting phases, depending on the dominant orbital component in the band near the Fermi energy. We show that our picture naturally explains the different low-temperature properties of CeMIn5 by carefully analyzing the crystalline electric field states.