skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Optimization of pulsed current profile for magnetizing high T{sub c} bulk YBCO superconductors.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
926979
Report Number(s):
ANL/MSD/JA-55202
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Trans. Appl. Supercond.; Journal Volume: 34; Journal Issue: 5 ; 2006
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Chen, L., Cha, Y. S., Claus, H., Zheng, H., Veal, B. W., Peng, F. Z., Materials Science Division, IEEE, Univ. of Illinois at Chicago, and Michigan State Univ.. Optimization of pulsed current profile for magnetizing high T{sub c} bulk YBCO superconductors.. United States: N. p., 2006. Web.
Chen, L., Cha, Y. S., Claus, H., Zheng, H., Veal, B. W., Peng, F. Z., Materials Science Division, IEEE, Univ. of Illinois at Chicago, & Michigan State Univ.. Optimization of pulsed current profile for magnetizing high T{sub c} bulk YBCO superconductors.. United States.
Chen, L., Cha, Y. S., Claus, H., Zheng, H., Veal, B. W., Peng, F. Z., Materials Science Division, IEEE, Univ. of Illinois at Chicago, and Michigan State Univ.. Sun . "Optimization of pulsed current profile for magnetizing high T{sub c} bulk YBCO superconductors.". United States. doi:.
@article{osti_926979,
title = {Optimization of pulsed current profile for magnetizing high T{sub c} bulk YBCO superconductors.},
author = {Chen, L. and Cha, Y. S. and Claus, H. and Zheng, H. and Veal, B. W. and Peng, F. Z. and Materials Science Division and IEEE and Univ. of Illinois at Chicago and Michigan State Univ.},
abstractNote = {},
doi = {},
journal = {IEEE Trans. Appl. Supercond.},
number = 5 ; 2006,
volume = 34,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • A pulsed current technique for measuring the critical transport properties of superconductors as a continuous function of current or temperature is described. Greatly reduced sample heating permits investigation of both the weak link'' and intrinsic properties of granular superconductors. Results obtained for various high {ital T}{sub {ital c}} oxide superconductors provide an example of the technique's application. Both intergranular and intragranular critical current densities are extracted from the data. Current-voltage measurements using the pulse method are corroborated by traditional dc measurements.
  • From the zero-field-cooled and field-cooled ac magnetic susceptibility measurements of bulk ceramic YBa{sub 2}Cu{sub 3}O{sub {ital y}} (YBCCO) high-{ital T}{sub {ital c}} superconductors, a low-field irreversibility line has been found which lies very close to {ital H}{sub {ital cl}}({ital T}) in the {ital H}-{ital T} plane as a result of a strong flux trapping. Although both the real and imaginary parts of the ac magnetic susceptibility in these ceramic samples are very sensitive to the ac field amplitude, no significant irreversible behavior could be observed in the absence of a dc magnetic field. By measuring the ac susceptibilities at constantmore » temperature as a function of dc and ac fields, our results exhibit clear evidence for the existence of a field near {ital H}{sub {ital cl}} that demarcates the transition from a reversible to an irreversible (hysteretic) behavior.« less
  • This paper reports on the magnetization behaviors of single phase Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} bulk superconductors which have been studied by measurement of the DC susceptibility. It is found that there are two lower critical field. One which is near 10 Oe at 77K is defined as a weak lower critical field and denoted by H{sub c1J}. dH{sub c1J}/dT is about 0.2 Oe/K near T{sub c}. Another is still called as usual lower critical field, H{sub c1}. It is 60 Oe at 77K and dH{sub c1}/dT is about 4.6 Oe/K. The detailed measurement of DC magnetization shows also thatmore » an anomaly of the magnetization curve appears between H{sub c1J} and H{sub c1}. The amplitudes of anomalous peak and valley have some difference depending on how samples are prepared.« less
  • The magnetization behaviors of single phase Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-{delta}/ bulk superconductors have been studied by measurement of the DC susceptibility. It is found that there are two lower critical field. One which is near 10 Oe at 77{Kappa} is defined as a weak lower critical field and denoted by H/sub clJ/. dH/sub clJ//dT is about 0.2 Oe/{Kappa} near T/sub c/. Another is still called as usual lower critical field, H/sub cl/. It is 60 Oe at 77{Kappa} and dH/sub cl//dT is about 4.6 Oe/{Kappa}. The detailed measurement of DC magnetization shows also that an anomaly of the magnetizationmore » curve appears between H/sub clj/ and H/sub cl/. The amplitudes of anomalous peak and valley have some difference depending on how samples are prepared. The mechanism of H/sub clj/ appearance and the anomaly of the magnetization has been discussed in Soft Sponge Model.« less
  • We have developed a far-infrared-absorption-measurement method using an optically pumped far-infrared laser. The temperature dependence of the light absorption by high-{ital T}{sub {ital c}} superconductors has been investigated for the photon energy between 7.6 and 17.6 meV in the temperature region between 12 and 160 K. A well-defined transition temperature was obtained from the absorption measurement. With decreasing temperature, the absorption decreased, but did not reach zero even at sufficiently low temperatures.