Optical study of the charge-density-wave mechanism in 2H-TaS_2 and Na_xTaS_2

W. Z. Hu; G. Li; J. Yan; H. H. Wen; G. Wu; X. H. Chen; N. L. Wang

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Optical study of the charge-density-wave mechanism in 2H-TaS_2 and Na_xTaS_2

机译：2H-TaS_2和Na_xTaS_2中电荷密度波机理的光学研究

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We report an optical study of transition metal dichalcogenide 2H-TaS_2 and the Na intercalated superconductor Na_xTaS_2 over a broad frequency range at various temperatures. A clear gap feature was observed for 2H-TaS_2 when it undergoes the charge-density wave (CDW) transition. The existence of a Drude component in σ_1(ω) below T_(CDW) indicates that the Fermi surface of 2H-TaS_2 is only partially gapped in the CDW state. The spectral evolution of two different Na_xTaS_2 crystals further confirms that the partial gap structure observed in 2H-TaS_2 has a CDW origin. The CDW mechanism for 2H-TaS_2 and the competition between CDW and superconductivity in the Na_xTaS_2 system are discussed.

机译：我们报告了在各种温度下在宽频率范围内过渡金属二硫化氢2H-TaS_2和Na插入超导体Na_xTaS_2的光学研究。当2H-TaS_2经历电荷密度波（CDW）跃迁时，观察到明显的间隙特征。在T_（CDW）下方的σ_1（ω）中存在Drude分量，表明2H-TaS_2的费米表面在CDW状态下仅部分地带隙。两种不同的Na_xTaS_2晶体的光谱演化进一步证实，在2H-TaS_2中观察到的部分间隙结构具有CDW起源。讨论了2H-TaS_2的CDW机理以及Na_xTaS_2系统中CDW与超导之间的竞争。

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来源
《Physical review》 |2007年第4期|045103.1-045103.5|共5页
作者
W. Z. Hu; G. Li; J. Yan; H. H. Wen; G. Wu; X. H. Chen; N. L. Wang;
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作者单位

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080,People's Republic of China;

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正文语种 eng
中图分类固体物理学;
关键词
solid metals and alloys; charge-density-wave systems; optical properties; metals; semimetals; and alloys;

机译：固体金属和合金;电荷密度波系统;光学性质金属;半金属和合金;

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Optical study of the charge-density-wave mechanism in 2H-TaS_2 and Na_xTaS_2

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