AC susceptibility and harmonic generation in high $T_c$ superconductors = 고온 초전도체의 교류 자화율 및 고조파 발생

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High $T_c$ superconductors of $Y_1Ba_2Cu_3O_{7-x} and Bi(Pb)SrCaCuO were prepared by solid state reaction method. These samples are examined for AC susceptibility and Harmonics under several conditions with varying temperatures; AC and DC magnetic intensity, and frequencies. About 0.4-0.8K upshift in $T_c$ for high frequency (1MHz) in case of AC magnetic susceptibility measurement are all observed. Two steps transition is observed for Bi-system, the first transition is sensitive to frequency, but second transition is sensitive to AC and DC magnetic field. From the peak temperatures of x`` of AC susceptibility for AC magnetic intensity are obtained and magnetic response for two samples compared. We observed clearly all odd harmonics in the Harmonics measurement, up to at least n=7 for Y-system and n=31 for Bi-system. The results suggest that high $T_c$ superconductor is composed of grains, and these grains are connected by Josephson junction. The nonlinear properties due to superconducting transition was observed from second harmonics under DC magnetic fields and with temperatures.
Advisors
Kim, Ho-Chul김호철
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
1990
Identifier
67143/325007 / 000881046
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 1990.2, [ iii, 71 p. ]

URI
http://hdl.handle.net/10203/48226
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=67143&flag=dissertation
Appears in Collection
PH-Theses_Master(석사논문)
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