Enhancement at low temperatures of the critical current density for Au-coated MgB[sub 2] thin films

Choi, Eun-Mi; Lee, Hyun-Sook; Kim, Heon-Jung; Lee, Sung-Ik; Kim, Hyeong-Jin; Kang, W. N.
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p82
Academic Journal
We measured the superconducting critical current densities (J[sub c]) from the magnetization hysteresis (M–H) loop for Au-coated MgB[sub 2] thin films. The purpose of this experiment was to determine whether the vortex avalanche phenomenon which suppresses the J[sub c] for low temperature (T<15 K) and low field (H≤1000 Oe) could be cured by gold deposition. This avalanche, called flux noise, has been a headache in applications of MgB[sub 2] thin films. Fortunately, the flux noise in the M–H loop is suppressed with increasing Au-film thickness and finally disappears when the thickness of the gold becomes 2.55 μm. We found a way to remove one obstacle for applications of MgB[sub 2] thin films as an superconducting device. © 2004 American Institute of Physics.


Related Articles

  • Critical-state model for intermodulation distortion in a superconducting microwave resonator. McDonald, J.; Clem, J.R.; Oates, D.E. // Journal of Applied Physics;5/15/1998, Vol. 83 Issue 10, p5307 

    Provides information on a model for the treatment of intermodulation distortion in a superconducting transmission line caused by vortex penetration and hysteresis. Description of the model; Disadvantages of the use of high-temperature superconductors (HTS); Consideration of circular geometry.

  • Terahertz surface resistance of high temperature superconducting thin films. Wilke, I.; Khazan, M. // Journal of Applied Physics;3/15/2000, Vol. 87 Issue 6, p2984 

    Deals with a study on the terahertz surface resistance of high temperature superconducting thin films. Experimental techniques; Experimental results and discussion; Conclusions.

  • As-deposited high Tc and Jc superconducting thin films made at low temperatures. Inam, A.; Hegde, M. S.; Wu, X. D.; Venkatesan, T.; England, P.; Miceli, P. F.; Chase, E. W.; Chang, C. C.; Tarascon, J. M.; Wachtman, J. B. // Applied Physics Letters;9/5/1988, Vol. 53 Issue 10, p908 

    2000 Å as-deposited high Tc superconducting Y1Ba2Cu3O7-x films with zero-resistance temperatures of ∼89 K and critical current densities about 0.7×106 A/cm2 at 77 K have been reproducibly fabricated at a substrate holder temperature of 650 °C, using pulsed laser deposition, with...

  • Vortex flux creep and magnetic hysteresis in a type-II superconductor (abstract). Hasan, M. K.; Park, S. J.; Kouvel, J. S. // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p6343 

    Presents an abstract of the study 'Vortex Flux Creep and Magnetic Hysteresis in a Type-II Superconductor,' by M.K. Hasan, S.J. Park and J.S. Kouvel, published in the 'Journal of Applied Physics.'

  • Geometrical Surface Vortex Pinning in Superconducting Films. Kosse, A. I.; Kuzovlev, Yu. E.; Levchenko, G. G.; Medvedev, Yu. V.; Prokhorov, A. Yu.; Khokhlov, V. A.; Mikheenko, P. N. // JETP Letters;9/25/2003, Vol. 78 Issue 6, p379 

    A model is proposed for vortex pinning in a superconducting film with a rough surface. The model relates the critical current to the steepness of the surface relief and, at a high vortex concentration, to the distance between neighboring steepness maxima on the paths of vortex motion. The...

  • Temperature dependence of the critical current of YBCO–STO–LCMO heterostructures near T[sub c]. Khokhlov, V. A.; Prokhorov, A. Yu.; Drobotko, V. F.; Levchenko, G. G.; Mikheenko, P. N.; Chakalov, R.; Muirhead, C. // Low Temperature Physics;Feb2003, Vol. 29 Issue 2, p113 

    The complex differential susceptibility of a YBCO film and YBCO–STO–LCMO structures with different thicknesses of the STO layer (0, 2, and 7 nm) is investigated. It is shown that for a YBCO–LCMO structure the temperature of the superconducting transition T[sub onset] and the...

  • Low-temperature annealing effect of as-grown Bi-Sr-Ca-Cu-O thin films on superconducting property and the c-axis lattice constant. Miura, S.; Yoshitake, T.; Manako, T.; Miyasaka, Y.; Shohata, N.; Satoh, T. // Applied Physics Letters;9/25/1989, Vol. 55 Issue 13, p1360 

    As-grown crystallized Bi2Sr2Ca1Cu2Ox phase films were prepared on MgO(100) substrates by rf magnetron sputtering. The as-grown film showed the Tc onset of 92 K and the Tc end of 82 K. By annealing in the furnace at 480 °C after deposition, superconducting property and the c-axis lattice...

  • Reducing vortex density in superconductors using the `ratchet effect.' Lee, C.-S.; Janko, B.; Derenyi, I.; Barabasi, A.-L. // Nature;7/22/1999, Vol. 400 Issue 6742, p337 

    Presents research showing that the application of an alternating current to a superconductor patterned with an asymmetric pinning potential can induce vortex motion whose direction is determined only by the asymmetry of the pattern. Mechanism responsible for the phenomenon, the `ratchet...

  • Recovery of elastic constant of ultrathin Cu films by low temperature annealing. Nakamura, N.; Ogi, H.; Shagawa, T.; Hirao, M. // Applied Physics Letters;4/7/2008, Vol. 92 Issue 14, p141901 

    Annealing effect on the elastic constant of Cu thin films was investigated by acoustic-phonon resonance spectroscopy. Annealing treatment was performed after the deposition in vacuum condition for 30 min at various temperatures up to 200 °C. It did not cause obvious changes in the x-ray...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics