Optical study of the charge-density-wave mechanism in 2H-TaS2 and NaxTaS2

被引：52
|
作者：
Hu, W. Z.
Li, G.
Yan, J.
Wen, H. H.
Wu, G.
Chen, X. H.
Wang, N. L.
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
[3] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 04期
关键词：
TRANSITION-METAL DICHALCOGENIDES; FERMI-SURFACE; 2H-NBSE2;
D O I：
10.1103/PhysRevB.76.045103
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report an optical study of transition metal dichalcogenide 2H-TaS2 and the Na intercalated superconductor NaxTaS2 over a broad frequency range at various temperatures. A clear gap feature was observed for 2H-TaS2 when it undergoes the charge-density wave (CDW) transition. The existence of a Drude component in sigma(1)(omega) below T-CDW indicates that the Fermi surface of 2H-TaS2 is only partially gapped in the CDW state. The spectral evolution of two different NaxTaS2 crystals further confirms that the partial gap structure observed in 2H-TaS2 has a CDW origin. The CDW mechanism for 2H-TaS2 and the competition between CDW and superconductivity in the NaxTaS2 system are discussed.
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页数：5
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