کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9837801 | 1525284 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ultrasonic velocity in Zn substituted GdBaSrCu3O7âδ superconductor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Longitudinal and shear ultrasonic velocity in Zn substituted GdBaSr(Cu3âxZnx)O7âδ (x=0, 0.01, 0.03, 0.06 and 0.1) superconductors have been measured using the pulsed-echo-overlap method with frequency 5-10 MHz in the temperature range of 80-300 K. An elastic anomaly characterized by a slope change was observed in the x=0 sample in the longitudinal mode at around 220 K. This anomaly shifts towards lower temperature with increasing Zn content and vanishes when x=0.06 and 0.1. The characteristic Debye temperature and electron-phonon coupling constant were estimated using the standard BCS theory as well as the two-dimensional van Hove scenario. The variation in the elastic behaviours upon Zn doping may be due to the effect of changes in the spin correlation at the CuO2 planes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 357, Issues 3â4, 15 March 2005, Pages 253-258
Journal: Physica B: Condensed Matter - Volume 357, Issues 3â4, 15 March 2005, Pages 253-258
نویسندگان
R. Abd-Shukor, Chong Tet Vui,