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  • 1. McCulloch, I. P.
    et al.
    Juozapavicius, A.
    Rosengren, Anders
    KTH, Superseded Departments, Physics.
    Gulacsi, M.
    Ferromagnetism in Kondo lattice models2001In: Philosophical Magazine Letters, ISSN 0950-0839, E-ISSN 1362-3036, Vol. 81, no 12, p. 869-875Article in journal (Refereed)
    Abstract [en]

    We report the discovery of a new ferromagnetic phase in the one-dimensional Kondo lattice model for intermediate values of the coupling constant. This new ferromagnetic phase was observed using a non-Abelian density-matrix renormalization group algorithm, which allowed us to measure directly the magnetization of the ground state with high accuracy.

  • 2. Nussinov, Z.
    et al.
    Rosengren, Anders
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
    Exact ground states of extended t-J(z) models on a square lattice2007In: Philosophical Magazine Letters, ISSN 0950-0839, E-ISSN 1362-3036, Vol. 87, no 7, p. 515-526Article in journal (Refereed)
    Abstract [en]

    We examine special extended spin S = 1/2 fermionic and hard core bosonic t - J(z) models with nearest neighbour and next nearest neighbour interactions to find exact ground states. Some of these models display an exponentially large degeneracy with diagonal stripe-like patterns.

  • 3.
    Pan, Jinshan
    et al.
    KTH, Superseded Departments, Chemistry.
    Öijerholm, Johan
    KTH, Superseded Departments, Chemistry.
    Belonoshko, Anatoly
    KTH, Superseded Departments, Physics.
    Rosengren, Anders
    KTH, Superseded Departments, Physics.
    Leygraf, Christofer
    KTH, Superseded Departments, Chemistry.
    Self-diffusion activation energies in alpha-Al2O3 below 1000 degrees C: measurements and molecular dynamics calculation2004In: Philosophical Magazine Letters, ISSN 0950-0839, E-ISSN 1362-3036, Vol. 84, no 12, p. 781-789Article in journal (Refereed)
    Abstract [en]

    Results from impedance spectroscopy measurements at temperatures between 400 and 1000° C, for single crystal and highly pure and dense polycrystalline α-Al2O3 samples with well-defined grain size, are compared with that from molecular dynamics calculation. Between 650 and 1000° C, the measured activation energy for conductivity is 1.5 eV for the single crystal, and increases from 1.6 to 2.4 eV as the grain size decreases from 15 to 0.5 μ m. The molecular dynamics calculation leads to the conclusion that the self-diffusion activation energy is about 1.5 eV for O and 1.0 eV for Al in single crystal α-Al2O3. The much higher mobility of O ions makes the O ions responsible for the conductivity of the single crystal oxide. It seems that the grain boundary leads to an increase in the activation energy. However, the quantitative influence of grain boundary still needs to be explained. Between 400 and 650° C, the measured activation energy is about 1.0 eV and independent of the grain size.

  • 4.
    Thuvander, Mattias
    et al.
    Tillämpad Fysik, Mikroskopi och mikroanalys, Chalmers Tekniska Högskola.
    Zhou, Jing
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    Odqvist, Joakim
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    Hertzman, Staffan
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Hedström, Peter
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    Observations of copper clustering in a 25Cr-7Ni super duplex stainless steel during low-temperature aging under load2012In: Philosophical Magazine Letters, ISSN 0950-0839, E-ISSN 1362-3036, Vol. 92, no 7, p. 336-343Article in journal (Refereed)
    Abstract [en]

    Atom-probe tomography was used to investigate phase separation and copper (Cu) clustering in the ferrite phase of a 25Cr-7Ni super duplex stainless steel. The steel was subjected to a tensile load during aging at 325 degrees C for 5800 h. The degree of phase separation into alpha (Fe-rich) and alpha' (Cr-rich) was small, but still, it was the highest in the steel subjected to the highest load. Cu was found to cluster, and the number density of clusters increased with increasing load. In the material subjected to the highest load, Cu was enriched in regions that were neither Fe-rich nor Cr-rich. These regions also had the highest number density of Cu clusters.

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