High transition temperature superconductor LaBa2Cu3O7-y with zero resistance at 92 K

Wada, T.; Suzuki, N.; Maeda, T.; Maeda, A.; Uchida, S.; Uchinokura, K.; Tanaka, S.
June 1988
Applied Physics Letters;6/6/1988, Vol. 52 Issue 23, p1989
Academic Journal
Samples of LaBa2 Cu3 O7-y have been synthesized, which show a superconducting transition above 90 K. One of the samples shows a superconducting transition with an onset at 93 K and a zero resistivity at 92 K. These temperatures are the highest among those reported so far on this system and even higher than those in YBa2 Cu3 O7-y. The magnetic susceptibility measurement also shows that it has a superconducting transition with onset at around 93 K. To synthesize such good LaBa2 Cu3 O7-y requires two important procedures. First is sintering above 950 °C in N2 gas atmosphere and the second is annealing at 300 °C in dried O2 gas atmosphere.


Related Articles

  • Boundary Conditions of Electron at Interface to Ductility of Superconductor. Shuyu, Cheng // International Journal of Modern Physics B: Condensed Matter Phys;12/20/99, Vol. 13 Issue 29/31, p3492 

    Recent years, Prof. Cheng Kaijia raised and developed a new electron theory based on the first principles, which is called as TFDC by researchers in China. The theory clearly expounds the important role of boundary conditions of electron. It has been successfully applied and some valuable...

  • Reflectionless tunneling in planar Nb/GaAs hybrid junctions. Giazotto, Francesco; Cecchini, Marco; Pingue, Pasqualantonio; Beltram, Fabio; Lazzarino, Marco; Orani, Daniela; Rubini, Silvia; Franciosi, Alfonso // Applied Physics Letters;3/19/2001, Vol. 78 Issue 12, p1772 

    Reflectionless tunneling was observed in Nb/GaAs superconductor/semiconductor junctions fabricated by a two-step procedure. First, periodic δ-doped layers were grown by molecular-beam epitaxy near the GaAs surface, followed by an As cap layer to protect the surface during ex situ transfer....

  • Electron tunneling into superconducting filaments using mechanically adjustable barriers. Moreland, John; Ekin, J. W. // Applied Physics Letters;7/15/1985, Vol. 47 Issue 2, p175 

    A new type of squeezable electron tunneling (SET) junction has been developed for tunneling into superconducting filaments. Stable, mechanically adjustable tunneling barriers between the native surfaces of sputtered Nb films and 30-µm-diam Nb filaments were established in liquid helium at 4...

  • Multiparticle Tunneling during Field Electron Emission from Bi[sub 2]CaSr[sub 2]Cu[sub 2]O[sub 8]. Maslov, V. I. // Technical Physics Letters;Feb2001, Vol. 27 Issue 2, p153 

    An analysis of data on the experimental statistics of the field electron emission (FEE) from an oxide superconductor of the Bi[sub 2]CaSr[sub 2]Cu[sub 2]O[sub 8] system reveals the multielectron tunneling effect. The spectral curves and statistical data obtained under various experimental...

  • Quasiparticle states in superconducting superlattices. Vanević, M.; Radović, Z. // European Physical Journal B -- Condensed Matter;Aug2005, Vol. 46 Issue 3, p419 

    The energy bands and the global density of states are computed for superconductor / normal-metal superlattices in the clean limit. Dispersion relations are derived for the general case of insulating interfaces, including the mismatch of Fermi velocities and effective band masses. We focus on the...

  • From insulator to superconductor.  // Nature;8/17/2000, Vol. 406 Issue 6797, p687 

    Discusses a study by Batlogg and his colleagues, published in the August 17, 2000 issue of 'Nature,' in which they describe how to make superconducting transistors from anthracene, tetracene and pentacene. Organic materials which are insulators under normal conditions; Issue of the physical...

  • SUPERCONDUCTING RF PHOTOINJECTORS:: AN OVERVIEW. SEKUTOWICZ, J. // International Journal of Modern Physics A: Particles & Fields; G;9/10/2007, Vol. 22 Issue 22, p3942 

    R&D programs based on various approaches, at BNL, FZ-Rossendorf, Beijing University and AES generate optimism that low emittance continuous wave operating SRF-guns and injectors will be available in the near future. This contribution covers present status of these programs and it presents...

  • Functional derivatives of Tfor a two-band superconductor: application to MgB. Mitrovic, B. // European Physical Journal B -- Condensed Matter;Apr2004, Vol. 38 Issue 3, p451 

    We address the question of how phonons of various frequencies contribute to the superconducting transition temperatureTc of a multi-band superconductor by considering the functional derivatives ofTc with respect to various intraband and interband electron-phonon coupling functions. A general...

  • Delocalization of quasiparticles in quasi-two-dimensional disordered superconductors with s-wave pairing. Zhi-Jie Qin; Shi-Jie Xiong // European Physical Journal B -- Condensed Matter;Aug2005, Vol. 46 Issue 3, p325 

    We investigate localization behavior of quasiparticles in disordered multi-plane superconductors with s-wave pairing. By introducing disorder with random site energies, the spatial fluctuations of Bogoliubov-de Gennes pairing potential are self-consistently determined. The size dependence of...


Read the Article


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

Try another library?
Sign out of this library

Other Topics