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    <title>Toward the nonmetal-to-metal phase transition of helium</title>
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  <abstract type="Summary">Properties of helium under high pressure are of great importance for a variety of astrophysical objects. This work presents results of extensive ab initio calculations for high-pressure helium regarding the equation of state, the melting line, the electrical conductivity, the reflectivity, and the band gap. The calculations determined a higher-order phase transition from an insulating to a conducting phase which has been discussed for decades. This work finally proposes an update of the phase diagram of helium and discusses its implications on dwarf stars and giant planets.&lt;eng&gt;</abstract>
  <abstract type="Summary">Die Eigenschaften von Helium unter hohem Druck sind wichtig für eine Vielzahl von astrophysikalischen Objekten. Diese Arbeit präsentiert die Ergebnisse umfangreicher Ab-initio-Berechnungen für Helium. Insbesondere wurde die Zustandsgleichung, die elektrische Leitfähigkeit, das Reflexionsvermögen und die Bandlücke berechnet. Die Ergebnisse weisen einen kontinuierlichen Phasenübergang zwischen isolierendem und elektrisch leitfähigem Helium nach. Schließlich zeigt diese Arbeit ein aktualisiertes Phasendiagramm von Helium und diskutiert die Konsequenzen für Zwergsterne und Riesenplaneten.&lt;ger&gt;</abstract>
  <note type="statement of responsibility">vorgelegt von Martin Preising</note>
  <note>Enthält Zeitschriftenartikel</note>
  <note>GutachterInnen: Ronald Redmer (Universität Rostock) ; Gerd Steinle-Neumann (Bayrisches Geoinstitut)</note>
  <note type="thesis">Dissertation Universität Rostock 2021 Kumulative Dissertation</note>
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      <title>Toward the nonmetal-to-metal phase transition of helium</title>
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      <publisher>Rostock : Universität Rostock, 2021</publisher>
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      <form>V, 134 Seiten</form>
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      <namePart>Preising, Martin, 1990 - </namePart>
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