电荷-密度-波相变对2H-二硫化钽电输运和拉曼光谱的影响,Applied Physics Letters

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电荷-密度-波相变对2H-二硫化钽电输运和拉曼光谱的影响
Applied Physics Letters ( IF 3.5 ) Pub Date : 2019-04-08 , DOI: 10.1063/1.5086951
Kai Zhang _{1,

2,

3} , Zi-Yu Cao _{1,

2,

3} , Xiao-Jia Chen ₃

Affiliation

在 2H-TaS2 上进行电传输和拉曼光谱测量，以研究电荷密度波的形成和特征。通过电阻率斜率随温度的突然变化、磁阻率的急剧上升和霍尔系数的显着变化检测到低于锁定温度的电荷密度波状态的进入。同时，双声子模式的频率随着温度的降低而降低。当接近锁定温度时，双声子模式的消失也证明了电荷密度波的形成。在电荷密度波状态下，E2g 和 A1g 对称性中新产生的电荷密度波模式随着温度的降低呈现蓝移。这些结果表明电输运测量和拉曼光谱的组合技术在研究具有强电子-声子耦合的材料中的电荷-密度-波序方面是强大的。在 2H-TaS2 上进行电输运和拉曼光谱的测量以研究电荷密度波的形成和特征。通过电阻率斜率随温度的突然变化、磁阻率的急剧上升和霍尔系数的显着变化检测到低于锁定温度的电荷密度波状态的进入。同时，双声子模式的频率随着温度的降低而降低。当接近锁定温度时，双声子模式的消失也证明了电荷密度波的形成。在电荷密度波状态下，E2g 和 A1g 对称性中新产生的电荷密度波模式随着温度的降低呈现蓝移。这些结果表明，电输运测量和拉曼光谱的组合技术在研究具有强电子-声子耦合的材料中的电荷-密度-波序方面是强大的。

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Effects of charge-density-wave phase transition on electrical transport and Raman spectra in 2H-tantalum disulfide

Measurements of electrical transport and Raman spectroscopy are performed on 2H-TaS2 to study the formation and the character of the charge density wave. The entry of the charge-density-wave state below the lock-in temperature is detected by the sudden change of the resistivity slope with temperature, the sharp rise of the magneto-resistivity, and the significant change in the Hall coefficient. Meanwhile, the frequency of the two-phonon mode decreases with decreasing temperature. When approaching the lock-in temperature, the formation of the charge density wave is also evidenced by the disappearance of the two-phonon mode. In the charge density wave state, the newly born charge-density-wave modes in the E2g- and A1g-symmetries exhibit a blue-shift with decreasing temperature. These results suggest that the combined techniques of electrical transport measurement and Raman spectroscopy are powerful in studying the charge-density-wave order in materials with strong electron-phonon coupling.Measurements of electrical transport and Raman spectroscopy are performed on 2H-TaS2 to study the formation and the character of the charge density wave. The entry of the charge-density-wave state below the lock-in temperature is detected by the sudden change of the resistivity slope with temperature, the sharp rise of the magneto-resistivity, and the significant change in the Hall coefficient. Meanwhile, the frequency of the two-phonon mode decreases with decreasing temperature. When approaching the lock-in temperature, the formation of the charge density wave is also evidenced by the disappearance of the two-phonon mode. In the charge density wave state, the newly born charge-density-wave modes in the E2g- and A1g-symmetries exhibit a blue-shift with decreasing temperature. These results suggest that the combined techniques of electrical transport measurement and Raman spectroscopy are powerful in studying the charge-density-wave order in materials with strong electron-phonon coupling.

更新日期：2019-04-08

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