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  • 1. Bäckström, Joakim
    et al.
    Rubhausen, M.
    Kall, M.
    Borjesson, L.
    Litvinchuk, A. P.
    Kakihana, M.
    Osada, M.
    Dabrowski, B.
    Raman scattering in YBa2Cu4O8 and PrBa2Cu4O8 - indications of pseudogap effects in non-superconducting PrBa2Cu4O82000Inngår i: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 341, s. 2251-2252Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    By analysis of the temperature evolution of Raman spectra, we connect an observed supression in low-energy electronic density of states to an anomalous sharpening of the Ba-phonon mode in superconducting YBa2Cu4O8 (Y-124) at around T=150 K. We link the supression of electronic excitations to an opening of a pseudogap. Similar effects observed for the Ba-phonon mode at roughly the same temperature in non-superconducting PrBa2Cu4O8 (Pr-124) suggests that a pseduogap opens up around 150 K also in this material.

  • 2. Hu, Q H
    et al.
    Johansson, L G
    Chen, H Q
    Ivanov, Z G
    Erts, D
    Olin, Håkan
    Department of Physics, Chalmers University of Technology.
    Claeson, T
    Stepantsov, E A
    Properties of Tl-2201 thin films1997Inngår i: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, PHYSICA C, Vol. 282-287, nr Part 2, s. 1075-1076Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tl2Ba2CuO6 (Tl-2201) thin films were synthesised on single crystal LaAlO3 and SrTiO3 substrates and on bicrystal LaAlO3 by an ex-situ process. Depending on thallium content and processing conditions, the films were orthorhombic or tetragonal. Tc was in the range 30 – 92 K while Jc reached 4.106A/cm2 at 12 K. By oxygen depletion, Tc was increased by 15 – 20 K for some films.

  • 3. Kakihana, M.
    et al.
    Kato, S.
    Petrykin, V.
    Bäckström, Joakim
    Borjesson, L.
    Osada, M.
    A simple and reproducible way to synthesize PrBa2Cu4O8 under 1 atm of oxygen by amorphous citrate method1999Inngår i: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 321, s. 74-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A simple aqueous solution technique utilizing citric acid (CA) as a complexant was applied to prepare PrBa2Cu4O8 (Pr124) at ambient oxygen pressure. Heating of a mixed-solution of CA, water (H2O) and ions of Pr, Ba and Cu with a molar ratio of [CA]:[H2O]:[Pr + Ba + Cu] = 3.6:40:1 on a hot-plate set at 200 degrees C produced a transparent amorphous citrate "gel" without any precipitation, which after heat-treatment at 450 degrees C was converted to a precursor for Pr124. The Pr124 compound with only minor traces of BaCuO2, PrBaO3 and CuO formed after heat-treating the precursor twice at 850 degrees C for 60 h under 1 atm oxygen pressure. The amount of impurities in the citrate-derived Pr124 was approximately half of that in the best sample previously prepared by the more elaborate high-pressure technique. (C) 1999 Elsevier Science B.V. All rights reserved.

  • 4. Osada, M.
    et al.
    Kakihana, M.
    Kall, M.
    Bäckström, Joakim
    Borjesson, L.
    Andersen, N. H.
    Photoinduced effects and oxygen dynamics in YBa2Cu3Ox2001Inngår i: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 364, s. 545-548Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Oxygen-deficient YBa2Cu3Ox (Y123) exhibits persistent photoconductivity when illuminated by visible light. We have investigated resonant Raman spectra as a function of excitation wavelength and temperature, which shed new light on photoinduced effects and chain oxygen dynamics in Y123. Experimental evidence suggests that the mechanism behind the unusual photoinduced effects primary involves photoinduced oxygen ordering. Our Raman data also constitute the non-diffraction observations of the superstructure phase transition in Y123. (C) 2001 Elsevier Science B.V. All rights reserved.

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