Abstract
Magnetic shields of various high-temperature superconductors, YBa2Cu3O7−x (YBCO), YBa2Cu3O7−x -Ag composites (random inclusions as well as non-random coatings) and Bi2Sr2Ca2Cu3O x (BSCCO) were prepared by uniaxial as well as isostatic compression with various dimensions. The shielding properties were measured at 77 K for dc and ac magnetic fields in the range of frequencies from 100 Hz to 10 kHz. The critical penetration field (CPF), defined as the value of the applied magnetic field at which a detectable field was observed inside the cylinder, varied from cylinder to cylinder and also with the ageing of the cylinders in the case of YBCO shields. The highest value of CPF was 16 G at 77 K for YBCO shield prepared by isostatic compression. Even though the stability of BSCCO shields with respect to ageing is good, the CPF values are very low compared to those for YBCO. Detailed studies were performed in the case of YBCO shields. The CPF decreased as a function of time over a period of 90 days. The CPF decreased as the frequency of the applied field was increased. The wave form of the field inside the pot for a sinusoidal applied field was highly distorted and showed the presence of higher harmonics with appreciable amplitude. The wave form was Fourier-analysed to yield the field inside the shield along with the harmonics. The shields with Ag addition seem to give better performance at high fields.
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Aswathy S, Ganesan V, Chandrasekaran K D, Subba Rao G V and Srinivasan R 1989DAE Symposium on Solid State Physics, Madras, India
Cui C J, Wang S G, Jiang H M, Li J Z, Lin C D, Liu H Z, Zheng Q L, Fu Y S, Luo Z L and Qiao W C 1989IEEE Trans. Mag. 25 2273
Ganesan V and Srinivasan R 1989High Temperature Superconductors, IIT Madras Newsletter2 1
Hattori T, Higemoto N, Kanazawa S and Kobayashi M 1988Jpn. J. Appl. Phys. 27 L1120
Karthikeyan J, Paithankar A S, Sreekumar K P, Venkataramani N and Rohatgi V K 1989Cryogenics 29 915
Koike A, Hoshino K, Ohta H, Kotaka H, Sudoh E, Katoh K and Takahara H 1991Physica C185–189 2613
Newman D 1990Superconductor Ind. Fall 16
Purpura J W and Clem T R 1989IEEE Trans. Mag. 25 2506
Russel G J and Tayler K N R 1989J. Appl. Phys. 66 5498
Shigematsu K, Ohta H, Hoshino K, Takayama H, Yagishita O, Yamazaki S, Takahara H and Aono M 1989Jpn. J. Appl. Phys. 28 L813
Srinivas B and Subba Rao G V 1992Bull. Mater. Sci. 15 403
Symko O G, Yeh W J, Zheng D J and Kulkarni S 1989J. Appl. Phys. D65 2142
Vlakhov E S, Kovachev V T, Polak M, Majoros M, Dimitriev Y B, Jabazov S, Kashchieva E and Staneva A 1991Physics C175 335
Willis J O, McHenry M E, Maley M P and Sheinberg H 1989IEEE Trans. Mag. 25 2502
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Ganesan, V., Srinivasan, R., Aswathy, S. et al. Magnetic shielding using high-temperature superconductors. Bull. Mater. Sci. 17, 87–93 (1994). https://doi.org/10.1007/BF02747637
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DOI: https://doi.org/10.1007/BF02747637