Microscopic Mechanism and Pairing Symmetry of Superconductivity in the Noncentrosymmetric Heavy Fermion Systems CeRhSI_3 and CeIrSi_3(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We study the pairing symmetry of the noncentrosymmetric heavy fermion superconductors CeRhSi_3 and CeIrSi_3 under pressures, which are both antiferromagnets at ambient pressure. We solve the Eliashberg equation by means of the random phase approximation and find that the mixed state of extended s- and p-wave rather than the d + f wave state could be realized by enhanced antiferromagnetic spin fluctuations. It is elucidated that the gap function has line nodes on the Fermi surface and the resulting density of state in the superconducting state shows a similar character to that of usual d-wave superconductors, resulting in the NMR relaxation rate 1/(T_1T) that exhibits no coherence peak and behaves like 1/(T_1T) ∝ T^2 at low temperatures.
- 社団法人日本物理学会の論文
- 2008-05-15
著者
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KAWAKAMI Norio
Department of Applied Physics, Osaka University
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Kawakami Norio
Department Of Applied Physics Osaka University
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Tada Yasuhiro
Department of Otolaryngology, Fukushima Medical University, School of Medicine
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FUJIMOTO Satoshi
Department of Physics, Faculty of Science, Kyoto University
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Tada Yasuhiro
Department Of Applied Physics Osaka University
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Fujimoto Satoshi
Kyoto Univ. Kyoto
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Fujimoto Satoshi
Department Of Physics Kyoto University
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Fujimoto Satoshi
Department Of Hygiene And Microbiology Faculty Of Veterinary Medicine Hokkaido University
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