Volume 47, Number 1, July 1999
|Page(s)||104 - 109|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Acoustic attenuation study on the normal-state pseudogap in underdoped
National Laboratory of Solid State Microstructures, Institute for Solid State Physics Center for Advanced Studies in Science and Technology of Microstructures Nanjing 210093, P. R. China
2 Northwest Institute of Non-ferrous Metal Research - Xi'an 710016, P. R. China
Accepted: 29 April 1999
Internal friction (IF) measurement in the kHz frequency region has been performed for underdoped . A rapid decrease of internal friction with decreasing temperature is observed at a temperature , which is considered as the opening of a pseudogap. Based on the feature of pseudogap described by V. J. Emery and BCS theory, a power law decrease of internal friction with temperature at Tg is derived and the index is estimated, which is consistent with the experiments. The decrease of the spin-lattice relaxation rate for NMR near 150 K in the underdoped YBCO, similar to that of internal friction, can be explained in the same way. Furthermore, in view of the different phase coherence effect on IF and , it can be predicted that another decrease for internal friction will occur near Tc but not for . The conclusion is confirmed by the experiments. In addition, the reported anomaly of resistivity near for the underdoped YBCO is discussed too.
PACS: 74.25.Ld – Mechanical and acoustical properties, elasticity, and ultrasonic attenuation / 74.72.Bk – Y-based cuprates
© EDP Sciences, 1999
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.