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  • 1
    Electronic Resource
    Electronic Resource
    Giant negative magnetoresistance in a nonmagnetic semiconductor (1999)
    Springer
    JETP letters 69 (1999), S. 386-391 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Vn ; 72.20.My
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of a classical III–V semiconductor (InSb) doped with 3d magnetic ions (Mn2+, having a localized spin S=55/2) reveal some unexpected transport properties. It is found that the transition from the metallic to the low-temperature insulator phase occurs at an impurity concentration N Mn∼N cr=2× 1017 cm−3 and a temperature T〈T cr∼1 K. Under these conditions a giant negative magnetoresistance arises. The experimental results can be explained in terms of the onset of a hard Mott-Hubbard gap Δ in the impurity band formed by the shallow manganese acceptor in InSb at N Mn∼N cr. A model describing the gap formation is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568039
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  • 2
    Electronic Resource
    Electronic Resource
    The “Paramagnetic” Meissner Effect in Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 733-736 
    Details
    ISSN: 1572-9605
    Keywords: Paramagnetic Meissner effect ; π-junction ; magnetic moment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract There are a number of publications concerning the observation of a paramagnetic signal in HTSC ceramic samples during field-cooling procedures. Some authors assume that this signal is connected with spontaneous currents and discuss the possibility of the existence of π-junctions in Josephson media. In this work, it is shown that the paramagnetic signal could appear in the case of capture and compression of the magnetic flux in a sample during field-cooling procedures. The results of numerical calculation of the magnetic moment for different configurations of the sample and flux compression are presented. The unusual behavior of longtime relaxation of the magnetic moment in experiments on capture of magnetic flux is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022693107198
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