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  • 2000-2004  (1)
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4440-4442 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of electron cyclotron resonance plasma cleaning on the contact resistance between a superconducting Nb layer and a two-dimensional electron gas in a strained InxGa1−xAs/InP heterostructure is investigated. Cleaning by a He/H plasma results in a rough semiconductor surface and a high interface resistance. In contrast, by using a pure He plasma a smooth semiconductor surface with a considerably lower interface resistance is obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1939-1941 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Schottky contacts on n-In0.53Ga0.47As have been made by metal deposition on substrates cooled to a temperature of 77 K. The current-voltage and capacitance-voltage characteristics showed that the Schottky diodes formed at low temperature had a much improved barrier height compared to those formed at room temperature. The Schottky barrier height φB, was found to be increased from ∼0.2 to 0.60 eV with Ag metal. For the low temperature diode, the saturation current density, J0, was about four orders smaller than for the room temperature diode. Deep level transient spectroscopy studies of n-InGaAs low temperature diodes exhibited one electron trap located at Ec-0.23 eV. This trap level was identified as a bulk trap.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Sodium iron chalcogenides, Na6FeS4, Na6FeSe4 ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Magnetic Properties of the Sodium Iron Chalcogenides Na6FeS4 and Na6FeSe4The compounds Na6FeS4 and Na6FeSe4 have been synthesized by fusion reactions of sodium carbonate with iron and chalcogen in a stream of hydrogen.Structural investigations on single crystals show that both compounds crystallize in an atomic arrangement isotypic with Na6ZnO4 (space group P63mc). The structure is characterized by isolated [FeX4]-tetrahedra.The magnetic susceptibilities show Curie-Weiss behaviour. The deviations at low temperatures are obviously caused by antiferromagnetic interactions.
    Notes: Durch Schmelzreaktionen von Natriumcarbonat mit Eisen und Chalkogen im Wasserstoffstrom gelang die Darstellung von Na6FeS4 und Na6FeSe4.Röntgenstrukturuntersuchungen an Einkristallen ergaben daß die beiden Verbindungen isotyp kristallisieren. Die Atomanordnung entspricht der des Na6ZnO4 (Raumgruppe P63mc). Als charakteristische Baueinheit treten isolierte [FeX4]6--Tetraeder auf.Die Temperaturabhängigkeiten der magnetischen Suszeptibilitäten lassen sich mit einem Curie-Weiss-Verhalten beschreiben. Bei tiefen Temperaturen treten Abweichungen von diesem Verhalten auf, die offensichtlich auf antiferromagnetische Wechselwirkungen zurückzuführen sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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