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	Author	Rodriguez, E.; Luzuriaga, J.; NÃºÃ±ez Regueiro, M.; Fainstein, C.
	Title	Low temperature internal friction peak in high Tc superconductors			Type	Journal Article
	Year	1991	Publication	Solid State Communications	Abbreviated Journal	Solid State Commun.
	Volume	77	Issue	10	Pages	777-780
	Keywords	Ceramic Materials; Oxides – Acoustic Properties; Yttrium Compounds – Acoustic Properties; Acoustic Variables Measurement; Attenuation Peak; Calcium Compounds; Low Temperature Internal Friction Peak; Strontium Compounds; Thermally Activated Relaxation Behavior; High Temperature Superconductors
	Abstract	We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0038-1098	ISBN		Medium
	Area		Expedition		Conference
	Notes	ISI:A1991FA71400006			Approved	no
	Call Number	BT @ hernan @			Serial	256
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