Abstract
The effect of MgO nano-oxide on both superconducting and dielectric properties of polycrystalline (Cu0.25Tl0.75)-1234 was studied. The MgO-content varied from x=0.0 up to 1.0 wt% of the sample’s total mass. The volume fraction of the prepared samples (x=0.0, 0.2, 0.6 and 1.0 wt%) was estimated from the room-temperature X-ray powder diffraction patterns. The superconducting transition temperature T c, calculated from resistivity data, increased from 122 to 136 K as x increased from 0.0 to 0.8 wt% and then it decreased to 117 K for x=1.0 wt%. Also, the dielectric properties of all samples were measured in the frequency range from 100 Hz to 4 MHz at different temperatures from 113 to 300 K. The real part of dielectric constant ε′ was strongly dependent on both temperature and frequency for all x values. The imaginary part of dielectric constant ε″ and loss factor tan δ showed dispersion which shift toward lower frequencies with decreasing temperature. The ac conductivity σ ac was derived from the admittance and sample dimensions in the same frequency range. It followed the power law σ ac(ω)∼ω −γ with γ≈0.8.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Khan, N.A., Khurram, A.A., Javed, A.: Physica C 422, 9 (2005)
Ihara, H., Tokiwa, K., Tanaka, K., Tsukamoto, T., Watanabe, T., Yamamoto, H., Iyo, A., Tokumoto, M., Umeda, M.: Physica C 282–287, 957 (1997)
Ihara, H., Tanaka, K., Tanaka, Y., Iyo, A., Terada, N., Tokumoto, M., Ariyama Hase, M., Sundaresan, A., Hamada, N., Miyashita, S., Tokiwa, K., Watanabe, T.: Physica C 341–348, 487 (2000)
Khan, N.A., Sekita, Y., Terada, N., Ihara, H.: Supercond. Sci. Technol. 14, 603 (2001)
Khan, N.A., Husnain, G.: Physica C 436, 51 (2006)
Mohammed, N.H., Roumié, M., Motaweh, H.A., Awad, El-Said Bakeer, D., Nsouli, B.: J. Supercond. Nov. Magn. 23(1), 465 (2010)
Awad, R.: J. Supercond. Nov. Magn. 21, 461 (2008)
Xu, X., Jiao, Z., Fu, M., Feng, L., Xu, K., Zuo, R., Chen, X.: Physica C 417, 166 (2005)
Homes, C.C., Vogt, T., Shapiro, S.M., Wakimoto, S., Ramirez, A.P.: Science 293, 673 (2001)
Cavdar, S., Koralay, H., Tugluoglu, N., Gunen, A.: Supercond. Sci. Technol. 18, 1204 (2005)
Nkum, R.K., Gyekye, M.O., Boakye, F.: Solid State Commun. 122, 569 (2002)
Konopka, J., Jose, R., Wolcyrz, M.: Physica C 435, 53 (2006)
Mazzara, G.P., Skirius, S., Cao, G., Chern, G., Clark, R.J., Crow, J.E., Mathias, H., O’Reilly, J.W., Testardi, L.R.: Phys. Rev. B 47, 8119 (1993)
Rey, C.M., Mathias, H., Testardi, L.R., Skirius, S.: Phys. Rev. B 45, 10639 (1992)
Reagor, D., Ahrens, E., Cheong, S.-W., Migliori, A., Fisk, Z.: Phys. Rev. Lett. 62, 2048 (1989)
Cao, G., O’ Reilly, J.W., Crow, J.E., Testardi, L.R.: Phys. Rev. B 47, 11510 (1993)
Testardi, L.R., Moulton, W.G., Mathias, H., Ng, H.K., Rey, C.M.: Phys. Rev. B 37, 2324 (1988)
Chen, J.W., Wang, J.C., Chen, Y.F.: Physica C 289, 131 (1997)
Shi, J.B.: Physica C 305, 35 (1998)
Awad, R.: J. Alloys Compd. 474, 517 (2009)
Mumtaz, M., Khan, N.A.: Physica C 469, 182 (2009)
Mumtaz, M., Khan, N.A.: Physica C 469, 728 (2009)
Karaca, I., Celebi, S., Varilci, A., Malik, A.I.: Supercond. Sci. Technol. 16, 100 (2003)
Badica, P., Iyo, A., Crisan, A., Ihara, H.: Supercond. Sci. Technol. 15, 975 (2002)
Guilmeau, E., Andrzejewski, B., Noudem, J.G.: Physica C 387, 382 (2003)
Lunkenheimer, P., Bobnar, V., Pronin, A.V., Ritus, A.I., Volkov, A.A., Loidl, A.: Phys. Rev. B 66, 052105 (2002)
Lunkenheimer, P., Fichtl, R., Ebbinghaus, S.G., Loidl, A.: Phys. Rev. B 70, 172102 (2004)
Krohns, S., Lunkenheimer, P., Ebbinghaus, S.G., Loidl, A.: Appl. Phys. Lett. 91, 022910 (2007)
Kaur, D., Narang, S.B., Thind, K.S.: J. Ceram Process. Res. 7(1), 31 (2006)
Wagner, K.W.: Ann. Phys. 40, 817 (1913)
Koops, C.G.: Phys. Rev. 83, 121 (1951)
Kamalasanan, M.N., Deepak Kumar, N., Chandra, S.: J. Appl. Phys. 74, 5679 (1993)
El Azrak, A., Nahoum, R., Bontemps, N., GuillouxViry, M., Thivet, C., Perrin, A., Labdi, S., Li, Z.Z., Raffy, H.: Phys. Rev. B 49, 9846 (1994)
Puchkov, A.V., Basov, D.N., Timusk, T.: J. Phys., Condens. Matter 8, 10049 (1996)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mohammed, N.H. Effect of MgO Nano-oxide Additions on the Superconductivity and Dielectric Properties of Cu0.25Tl0.75Ba2Ca3Cu4O12−δ Superconducting Phase. J Supercond Nov Magn 25, 45–53 (2012). https://doi.org/10.1007/s10948-011-1207-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-011-1207-4