DOI QR코드

DOI QR Code

Electrical Properties of a High Tc Superconductor for Renewed Electric Power Energy

  • Lee Sang-Heon (Department of Electronic Engineering, Sun Moon University)
  • Published : 2006.09.01

Abstract

Effects of $Ag_2O$ doping on the electromagnetic properties in the BiSrCaCuO superconductor. The electromagnetic properties of doped and undoped $Ag_2O$ in the BiSrCaCuO superconductor were evaluated to investigate the contribution of the pinning centers. It was confirmed experimentally that a larger amount of magnetic flux was trapped in the $Ag_2O$ doped sample than in the undoped one, indicating that the pinning centers of magnetic flux are related closely to the occurrence of the magnetic effect. We have fabricated superconductor ceramics by the chemical process. A high Tc superconductor with a nominal composition of $Bi_2Sr_2Ca_2Cu_3O_y$ was prepared by the organic metal salts method. Experimental results suggest that the intermediate phase formed before the formation of the superconductor phase may be the most important factor. The relation between electromagnetic properties of Bi HTS and the external applied magnetic field was studied. The electrical resistance of the superconductor was increased by the application of the external magnetic field. But the increase in the electrical resistance continues even after the removal of the magnetic field. The reason is as follows; the magnetic flux due to the external magnetic field penetrates through the superconductor and the penetrated magnetic flux is trapped after the removal of the magnetic flux. During the sintering, doped $Ag_2O$ was converted to Ag particles that were finely dispersed in superconductor samples. It is considered that the area where normal conduction takes place increases by adding $Ag_2O$ and the magnetic flux penetrating through the sample increases. The results suggested that $Ag_2O$ acts to amplify pinning centers of magnetic flux, contributing to the occurrence of the electromagnetic properties.

References

  1. P. N. Peters, R. C. Sick, E. W. Urban, C. Y. Huang, and M. M. Wu, 'Observation of Enhanced Properties in samples of Silver Oxide doped $YBa_2Cu_3O_7$', Appl. Phys. Lett., Vol. 52, p. 2066, 1988 https://doi.org/10.1063/1.99775
  2. M. Murakami, T. Oyama, H. Fujimoto, T. Taguchi, S.Gotoh, Y. Shiohara, N. Koshizuki, and S. Tanaka, 'Large Levitation Force due to Flux Pinning in YBaCuO Superconductors Fabricated by Melt- Powder-Melt-Growth Process ', Jpn. J. Appl. Phys., Vol. 29, No. 11, L1991, 1990 https://doi.org/10.1143/JJAP.29.L1991
  3. Y. Dimitriev and E. Kashchieva, 'Charge-density transport properties', J. Mater. Sci., Vol. 10, No. 2, p. 1419, 1995 https://doi.org/10.1007/BF00540832
  4. M. K. Wu, J. R. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Lao, Z. J. Huang, Y. Q. Wang, and C. W. Chu, 'Superconductivity at 93 K in a New Mixedphase Y-Ba-Cu-O Compound System at Ambient Pressure', Phys. Rev. Lett., Vol. 58, No. 9, p. 908, 1987 https://doi.org/10.1103/PhysRevLett.58.908
  5. Y. Iijima, M. Hosaka, N. Tanabe, N. Sadakata, T. Saitoh, O. Kohno, and K. Takeda, J. Mater. Res., 'Biaxial alignment control of YBCO films on random Ni-based alloy with textured YSZ films formed by ion-beam-assisted deposition', Vol. 12, p. 2913, 1997 https://doi.org/10.1557/JMR.1997.0386
  6. H. Asaoka and H. Takei, 'Crystal Growth Mechanism of $YBa_2Cu_3O_x$ from Coexisting Region of Solid with Melt', Jpn. J. Appl. Phys., Vol. 33, No. 7A, p. 923, 1994 https://doi.org/10.1143/JJAP.33.L923
  7. S. Jin, T. H. Tiefel, R. C. Sherwood, R. B. van Dover, M. E. Davis, G. W. Kammlott, and R. A. Fastnacht, 'Melt-textured Growth of Polycrystalline $YBa_2Cu_3O_{7-\delta}$- with High Transport Jc at 77 K', Phys. Rev. B, Vol. 37, No. 13, p. 7850, 1988 https://doi.org/10.1103/PhysRevB.37.7850
  8. G. W. Kammlott, T. H. Tiefel, and S. Jin, 'Recovery of 90 K Superconductivity in Transition-melt-doped Y-Ba-Cu-O', Appl. Phys. Lett., Vol. 56, No. 24, p. 2459, 1990 https://doi.org/10.1063/1.103255
  9. S.X.Dou, 'Improvement of Critical Current Density in YBa2Cu3O6+x Superconductor by Ag Addition', Jpn. J. Appl. Phys., Vol. 29, No. 9, p. L1621, 1990 https://doi.org/10.1143/JJAP.29.L1621
  10. K.Y.Lee, J.S.Yang, Y.S.Choi, D.H.Park, 'Specific Heat and Thermal Conductivity Measurement of XLPE Insulator and Semiconducting Materials', KIEE Transactions of the Korean Institute of Electrical Engineers, Vol. 55, No. 1, p. 6, 2006
  11. G.H.Pack, J.C.Lee, M.K.Hwang, Y.S.Choi, D.H.Park, 'Xe Plasma Property with Flat Lamp by Langmuir Probe', KIEE Transactions of the Korean Institute of Electrical Engineers, Vol. 55, No. 1, p. 50, 2006