Acoustic attenuation study on the normal-state pseudogap in underdoped

Q. M. Zhang; Y. N. Wang; A. Li; Q. Qiu; X. S. Xu; Y. Feng; L. Zhou

doi:10.1209/epl/i1999-00358-9

All issues

Volume 47 / No 1 (July 1999)

Europhys. Lett., 47 1 (1999) 104-109

Abstract

Issue		Europhys. Lett. Volume 47, Number 1, July 1999


Page(s)		104 - 109
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1999-00358-9
Published online		01 September 2002

Europhys. Lett., 47 (1), pp. 104-109 (1999)

Acoustic attenuation study on the normal-state pseudogap in underdoped $\rm YBa_{2}Cu_{3}O_{7-\delta }$

Q. M. Zhang¹, Y. N. Wang¹, A. Li¹, Q. Qiu¹, X. S. Xu¹, Y. Feng² and L. Zhou²

¹ 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

Received: 26 January 1999
Accepted: 29 April 1999

Abstract

Internal friction (IF) measurement in the kHz frequency region has been performed for underdoped $\rm YBa_{2}Cu_{3}O_{7-\delta }$ . A rapid decrease of internal friction with decreasing temperature is observed at a temperature $T_{\rm g}\ ( >T_{\rm c} )$ , 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 T_g is derived and the index is estimated, which is consistent with the experiments. The decrease of the spin-lattice relaxation rate $1/T_{1}$ 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 $1/T_{1}$ , it can be predicted that another decrease for internal friction will occur near T_c but not for $1/T _{1}$ . The conclusion is confirmed by the experiments. In addition, the reported anomaly of resistivity near $T^{*}(\sim 160\;{\rm K})$ 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

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