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  • 1.
    Ekström, Mikael
    et al.
    Mälardalen University, School of Innovation, Design and Engineering. Uppsala University, Sweden.
    Hartmann, Ola
    Uppsala University, Sweden.
    Karlsson, Erik
    Uppsala University, Sweden.
    Lidström, Erik
    Uppsala University, Sweden.
    Granberg, Per
    Uppsala University, Sweden.
    Nygren, M
    Mälardalen University, School of Innovation, Design and Engineering. Stockholm University, Sweden.
    Antiferromagnetism in Zn-doped La2CuO4 as observed by muon spin resonance spectroscopy2001In: Physical Review B - Condensed Matter and Materials Physics, ISSN 0163-1829, Vol. 64, no 18, p. 1845221-1845226, article id 184522Article in journal (Refereed)
    Abstract [en]

    The local fields seen by positive muons implanted in Zn-doped La2CuO4 show a distribution with a main peak attributed to muon sites far from the Zn ions and a satellite structure corresponding to muons residing closer to the Zn. The temperature dependence indicates a strong loss of magnetic order for Cu moments near the Zn atoms. The data can be understood in terms of a model where a Zn ion not only introduces a vacancy in the magnetic Cu lattice but also creates a RKKY-type disturbance. The electron spin polarization around the Zn ions induces a change of the magnetic moments on surrounding Cu ions. The AF lattice is found to be strongly perturbed within a radius of 10 Angstrom around each Zn ion. Possible consequences for the superconductivity of the corresponding Sr-doped materials are discussed.

  • 2.
    Karlsson, Patrik G.
    et al.
    Uppsala University.
    Göthelid, Emmanuelle
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, Department of Biology and Chemical Engineering.
    Richter, Jan H.
    Uppsala University.
    Sandell, Anders
    Uppsala University.
    Initial stages of ZrO2 chemical vapour deposition on Si(100)-(2x1) from zirconium tetra-tert-butoxide.2008In: Surface Science, Vol. 602, no 10, p. 1803-1809Article in journal (Refereed)
    Abstract [en]

    The initial stages of chemical vapor deposition of ZrO2 from zirconium tetra-tert-butoxide (ZTB) on Si(100)-(2x1) have been studied by Scanning Tunneling Microscopy (STM) and synchrotron radiation excited Photoelectron Spectroscopy (PES). The STM images and core level (PES) spectra indicate that the predominant surface modifications induced by ZTB are due to silicon carbonization and formation of zirconium dioxide. The carbonization reaction leads to formation of subsurface carbon and two types of reconstructions are discussed: dimer vacancies and dimer vacancies in conjunction with a rotated surface Si-dimer. Indications for the formation of small amounts of zirconium silicide are also found. No evidence for silicon oxidation can be observed with PES, in contrast to the interface properties previously found after larger exposures to ZTB.

  • 3. Nilson, Katharina
    et al.
    Palmgren, Pål
    Åhlund, John
    Schiessling, Joachim
    Göthelid, Emmanuelle
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, Department of Biology and Chemical Engineering.
    Mårtensson, Nils
    Puglia, Carla
    Göthelid, Mats
    STM and XPS characterization of zinc phthalocyanine on InSb(0 0 1)2008In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 602, no 2, p. 452-459Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Zinc phthalocyanine (ZnPc) adsorbed on the InSb(0 0 1)-c(8 × 2) surface has been studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Coverages from sub-monolayer to monolayer (ML) have been investigated. The molecules form ordered structures on the reconstructed rows of the surface with the molecular plane parallel to the surface. A change in the electronic structure between the sub-ML and higher coverages has been observed. Moreover, in order to study the influence of annealing on the electronic and geometric structures, the samples have been heated to elevated temperatures (about 640 K). In addition, multi-layer ZnPc films have been characterized by XPS measurements.

  • 4.
    Prytz, Kjell
    Högskolan i Gävle, Ämnesavdelningen för naturvetenskap.
    Electrolocation of the Weak Electric Fish2004Report (Other academic)
  • 5.
    Prytz, Kjell
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Meissner Effect in Classical Physics2018In: Progress In Electromagnetics Research M, ISSN 1937-8726, Vol. 64, p. 1-7Article in journal (Refereed)
    Abstract [en]

    The Meissner effect is explored based on the acceleration-dependent component of the Weber force. According to the Maxwell theory, a steady circulating current does not produce any dynamics on external resting charges; however, according to the Weber theory, the charges of the circulating current exhibit a centripetal acceleration, which affects the external charges at rest. It is demonstrated that the current generated in this manner can explain the Meissner effect in classical physics.

  • 6.
    Sundqvist, Annika
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Wärme, Annika
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Magnus Magnet: Ett arbetsmaterial för undervisning i fysik i grundskolans tidigare år2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta utvecklingsarbete var att utifrån ett nyfikenhets­perspektiv skapa ett arbetsmaterial riktat till förskoleklass och skolår 1 i ämnet magnetism, samt att ta reda på vad begreppet nyfikenhet innebär.Produkten bestod av en högläsningsbok (Magnus Magnet) samt en lärarhandledning med arbetsgång och praktiska övningar. Materialet utvärderades av tre lärare och en lärarstudent. Utvärderingen var mestadels positiv och eleverna tyckte generellt att boken var rolig och underhållande. Till viss del kunde det konstateras att arbetsmaterialet väckte nyfikenhet hos eleverna om fenomenet magnetism. Slutsatsen var att en högläsningsbok samt praktiska övningar om magnetism är en bra metod för att förmedla nyfikenhet och intresse inför naturvetenskapliga fenomen till barn i de första skolåren.

     

  • 7.
    Åhlund, John
    et al.
    Uppsala Univ.
    Nilson, Katharina
    Uppsala Univ.
    Palmgren, Pål
    Kungliga Tekniska Hogskolan.
    Göthelid, Emmanuelle
    Mälardalen University, Department of Biology and Chemical Engineering.
    Schiessling, Joachim
    Uppsala Univ.
    Göthelid, Mats
    Mälardalen University, Department of Biology and Chemical Engineering.
    Mårtensson, Nils
    Uppsala Univ.
    Puglia, Carla
    Uppsala Univ.
    Molecular growth determined by surface domain patterns2008In: JOURNAL OF PHYSICAL CHEMISTRY C, ISSN 1932-7447, Vol. 112, no 17, p. 6887-6890Article in journal (Refereed)
    Abstract [en]

    The growth of Iron phthalocyanine (FePc) on InSb(001)c(8x2) at sub-monolayer coverage has been investigated with Scanning Tunneling Microscopy (STM). FePc adsorbs flat, centered on the in rows both at 70K and at room temperature (RT). However, the shapes of the two-dimensional molecular islands are fundamentally different; while the RT-growth results in chain-like structures along the [110]direction, as already observed for other Pc's adsorbed on the same surface, the islands are prolonged along the [-110], i.e. perpendicular to the substrate rows at 70K.

    The observations are explained based on a recently observed new surface phase at low temperature, resulting in structural domains on the surface. The molecular growth front follows the propagatingdomain boundary that freezes at low temperature.

  • 8.
    Åhlund, John
    et al.
    Uppsala University.
    Schnadt, Joachim
    University of Aarhus; University of Lund, Sweden.
    Nilson, Katharina
    Uppsala University.
    Göthelid, Emmanuelle
    Uppsala University; Department of Biology and Chemical Engineering, Mälardalen University, Sweden .
    Schiessling, Joachim
    Uppsala University.
    Mårtensson, Nils
    Uppsala University.
    Besenbacher, Flemming
    University of Aarhus,.
    Puglia, Carla
    Uppsala University.
    The adsorption of iron phthalocyanine on graphite: A scanning tunnelling microscopy study2007In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 601, no 17, p. 3661-3667Article in journal (Refereed)
    Abstract [en]

    Different adsorption phases of iron phthalocyanine (FePc) on highly oriented pyrolitic graphite (HOPG) have been characterized by scanning tunnelling microscopy (STM). Evaporation of FePc onto the graphite (0 0 0 1) surface, kept at room temperature, results in the formation of three-dimensional molecular islands.

    After annealing to 400 °C different two-dimensional features are identified, depending on the initial coverage. At low doses, domains with well defined boundaries have been observed, within which molecules tend to organise in chains. At higher coverage, islands exhibiting well-ordered densely-packed square or hexagonal molecular arrangement have been resolved. For the adsorption structures corresponding to one monolayer islands our results show that the molecules adsorb with the molecular plane parallel to the surface. The high resolution STM images allow us to resolve the orientation of single molecules and subsequently we suggest that the molecular monolayer is stabilized by van der Waals interactions. The characterization of the observed Moiré contrast and a comparison with other similar systems underlines the importance of the central metal in the molecule–molecule and molecule–substrate interactions, which govern the molecular adsorption geometry.

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