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

Hu  WZ; Li  G; Yan  JWen  HHWu  GChen  XHWang  NL

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

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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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《Physical review, B. Condensed matter and materials physics》 |2007年第4期|5103-1-5103-5-0|共5页
作者
Hu WZ; Li G; Yan JWen HHWu GChen XHWang NL;
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作者单位

Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China;

Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China;

Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China;

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正文语种英语
中图分类固体物理学;
关键词
TRANSITION-METAL DICHALCOGENIDES; FERMI-SURFACE; 2H-NBSE2;

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

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