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  • 1. Kanchanavatee, N.
    et al.
    Janoschek, M.
    Huang, K.
    White, B. D.
    Riseborough, P. S.
    Balatsky, Alexander V.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Los Alamos National Laboratory, Los Alamos, USA.
    Maple, M. B.
    Emergence of higher order rotational symmetry in the hidden order phase of URu2Si22017In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 97, no 2, p. 144-154Article in journal (Refereed)
    Abstract [en]

    Electrical resistivity measurements were performed as functions of temperature, magnetic field, and angle theta between the magnetic field and the c-axis of a URu2Si2 single crystal. The resistivity exhibits a two-fold oscillation as a function of theta at high temperatures, which undergoes a 180 degrees-phase shift (sign change) with decreasing temperature at around 35 K. The hidden order transition is manifested as a minimum in the magnetoresistance and amplitude of the two-fold oscillation. Interestingly, the resistivity also showed four-fold, six-fold, and eight-fold symmetries at the hidden order transition. These higher order symmetries were also detected at low temperatures, which could be a sign of the formation of another pseudogap phase above the superconducting transition, consistent with recent evidence for a pseudogap from point-contact spectroscopy measurements and NMR. Measurements of the magnetisation of single crystalline URu2Si2 with the magnetic field applied parallel and perpendicular to the crystallographic c-axis revealed regions with linear temperature dependencies between the hidden order transition temperature and about 25 K. This T-linear behaviour of the magnetisation may be associated with the formation of a precursor phase or 'pseudogap' in the density of states in the vicinity of 30-35 K.

  • 2.
    Oleynikov, Peter
    et al.
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
    Demchenko, L.
    Christensen, J.
    Hovmöller, Sven Erik
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Yokosawa, T.
    Döblinger, M.
    Grushko, B.
    Zou, X.D.
    Structure of the pseudodecagonal Al–Co–Ni approximant PD42006In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 86, no 3-5, p. 457-462Article in journal (Refereed)
    Abstract [en]

    A model for the pseudodecagonal approximant PD4 in the Al–Co–Ni system was deduced from single crystal X-ray diffraction data. The space group is Bbmm with a ?=?101.3, b ?=?32.1 and c ?=?4.1?Å. Atomic positions of 133 unique atoms in the unit cell with a reasonable geometry were found by direct methods and the difference Fourier syntheses. The obtained structure model is in good agreement with high-resolution electron microscopy images of PD4. Diffuse scattering observed along the a * direction in the hkl layers with l ?=?1/2, 3/2 etc. indicates a superstructure with a doubling of the periodicity along the c -axis and a lamellar disorder along the a -axis. If this diffuse scattering is taken into account, c ?=?8.2?Å.

  • 3.
    Shen, Zhijian
    et al.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Nicula, R.
    Ishizaki, K.
    Stir, M.
    Vaucher, S.
    Rapid synthesis and densification of single-phase Al-Cu-Fe quasicrystals by spark plasma sintering or microwave heating2010In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 91, no 19-20, p. 1478-6443Article in journal (Refereed)
    Abstract [en]

    Quasicrystalline (QC) phases are often stable only within narrow composition domains. For this reason, the synthesis of larger amounts of single-phase quasicrystalline powders is difficult. Powder metallurgical approaches, based on mechanical milling followed by conventional heating, have been explored in the recent past. The manufacturing process for single-phase quasicrystals - either in the form of powders or as bulk parts - can be accelerated by orders of magnitude using rapid heating methods that involve pulsed electric currents and/or high-frequency electromagnetic fields. Prior knowledge of the phase transformation sequence and transformation kinetics, as revealed by in situ time-resolved synchrotron radiation experiments, is crucial in obtaining single-phase quasicrystals. We report on the simultaneous synthesis and densification of bulk single-phase Al-Cu-Fe QCs by spark plasma sintering (SPS) within minutes and on the ultrafast synthesis of single-phase Al-Cu-Fe quasicrystalline powders by microwave heating within seconds. The effect of electric current application in the rapid processing of pre-alloyed powders is discussed in relation to the faster diffusion and enhanced phase transformation kinetics.

     

  • 4. Zhang, H.
    et al.
    Zou, Xiaodong
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Oleynikov, Peter
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
    Hovmöller, Sven Erik
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Structure relations in real and reciprocal space of hexagonal phases related to i-ZnMgRE quasicrystals2006In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 86, no 3-5, p. 343-348Article in journal (Refereed)
    Abstract [en]

    The µ 3 , µ 5 and µ 7 approximants in Mg-Zn-RE were related in real and reciprocal space. The structure factors of µ 3 , µ 5 and µ 7 have quite similar intensity distributions and identical phases for the strongest corresponding reflections. Structure models of any of µ 3 , µ 5 and µ 7 can be obtained from any of the others using the strong reflections approach.

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