Thermodynamic and critical properties of the charge density wave system ErTe₃

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• 作者：M. Saint-Paul^a ; ^b ; ^{michel.saint-paul@neel.cnrs.fr" class="auth_mail" title="E-mail the corresponding author} ; G. Remenyi^a ; ^b ; C. Guttin^a ; ^b ; P. Lejay^a ; ^b ; P. Monceau^a ; ^b
• 关键词：Rare earth tritellurides ; Charge density wave ; Specific heat ; Ultrasonic attenuation
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：504
• 期：Complete
• 页码：39-46
• 全文大小：1054 K

文摘

We present specific heat and ultrasonic measurements on the rare earth tritelluride ErTe₃ compound. Thermodynamic anomalies are observed at the upper charge density wave (CDW) phase transition T_CDW1=265 K and the second one at T_CDW2=155 K. Similar critical behaviors are found at both CDW phase transitions and that we tentatively described in terms of the 3D XY model. Different anisotropic stress dependences ∂T_CDW1/∂σ_ii$\partial T_{CDW1}/\partial {\sigma }_{ii}$ and ∂T_CDW2/∂σ_ii$\partial T_{CDW2}/\partial {\sigma }_{ii}$ are found at the two successive CDW phase transitions. Magnitude of the elastic constant anomalies at T_CDW2 is ten times smaller than that at T_CDW1. Anomalies in the elastic constants at the upper CDW T_CDW1 exhibit two dimensional features in the layer planes while in contrast a three dimensional behavior is observed at T_CDW2.