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  • 1
    Electronic Resource
    Electronic Resource
    A very low temperature scanning tunneling microscope for the local spectroscopy of mesoscopic structures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 128-131 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present the design and operation of a very low temperature scanning tunneling microscope (STM) working at 60 mK in a dilution refrigerator. The STM features both atomic resolution and micron-sized scanning range at low temperature. We achieved an efficient thermalization of the sample while maintaining a clean surface for STM imaging. Our spectroscopic data show unprecedented energy resolution. We present current–voltage characteristics and the deduced local density of states of hybrid superconductor–normal metal systems. This work is the first experimental realization of a local spectroscopy of mesoscopic structures at very low temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1331328
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  • 2
    Electronic Resource
    Electronic Resource
    Electron transport in a mesoscopic superconducting / ferromagnetic hybrid conductor (2003)
    Springer
    The European physical journal 31 (2003), S. 103-109 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.23.-b Electronic transport in mesoscopic systems – 74.80.Fp Point contacts; SN and SNS junctions – 72.25.-b Spin-polarized transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present electrical transport experiments performed on submicron hybrid devices made of a ferromagnetic conductor (Co) and a superconducting (Al) electrode. The sample was patterned in order to separate the contributions of the Co conductor and of the Co-Al interface. We observed a strong influence of the Al electrode superconductivity on the resistance of the Co conductor. This effect is large only when the interface is highly transparent. We characterized the dependence of the observed resistance decrease on temperature, bias current and magnetic field. As the differential resistance of the ferromagnet exhibits a non-trivial asymmetry, we claim that the magnetic domain structure plays an important role in the electron transport properties of superconducting / ferromagnetic conductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00014-x
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  • 3
    Electronic Resource
    Electronic Resource
    Andreev Reflection and Proximity effect (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 599-615 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Andreev Reflection is the key mechanism for thesuperconducting proximity effect. It provides phasecorrelations in a system of non-interacting electrons atmesoscopic scales, i.e. over distances much larger than themicroscopic lengths: Fermi wavelength and elastic electronmean free path. This field of research has attracted anincreasing interest in the recent years in part because of thetremendous development of nanofabrication technologies, andalso because of the richness of the involved quantum effects.In this paper we review some recently achieved advances. Wealso discuss new open questions, in particular non-equilibriumeffects and proximity effect in systems with ferromagneticelements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004635226825
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  • 4
    Electronic Resource
    Electronic Resource
    Coherence Between Superconducting Edge States in Superconducting Periodic Arrays of Artificial Defects (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 23-43 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transition line of superconducting arrays of holes exhibits a rich field structure due to the interference of superconducting states nucleated at the holes edges. We studied by means of resistance measurements their effect on the T* c (H) line as a function of transverse magnetic field using regular arrays of nanofabricated micron size holes. The arrays transition fields are higher than for the bulk. Moreover we found a nontrivial field modulation of the T* c (H) line with an inversion, with increasing field, of the modulation concavity which we assigned to a crossover from a collective to an isolated edge state regime. The high field regime is well described by the nucleation at a single hole in an infinite film. The modulation at low fields was found to be dominated by the interference of neighbor edge states when the inter-hole distance w becomes comparable to the coherence length ξ(T* c ). A comparison between arrays of different hole shape shows the influence of geometry on the type of interaction established, which can described either as a superconducting wire network or as a weak link array.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004622418666
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    Paper (German National Licenses)
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