Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering study of the flux-line lattice in a single crystal of Bi2.15Sr1.95CaCu2O8+x (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6784-6787 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A flux-line lattice (FLL) was observed in a single crystal of Bi2.15Sr1.95CaCu2O8+x (BSCCO) using small-angle neutron scattering methods. The sample has a superconducting transition at 85 K. The flux-line lattice is observed to melt, evidenced by the rapid disappearance of diffracted intensity as the temperature is increased above a field-dependent melting temperature. Diffracted intensity due to the vortex lattice also falls off as the applied field is increased. It is believed that this is a manifestation of the transition of the three-dimensional flux lines into two-dimensional pancake vortices. The Bragg intensity of the FLL peak is inversely proportional to the fourth power of the London penetration depth (λL). Hence, the temperature (T) dependence of the order parameter can be measured quite accurately from the intensity of the Bragg spots at different temperatures. In BSCCO with an applied field of 50 mT, the measured T dependence appears linear. The low-T behavior is of great interest for an understanding of the underlying mechanism for superconductivity in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358128
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Shear-limited flux pinning studied in superconducting thin-film devices (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 662-664 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report critical-current measurements on superconducting devices containing nanometer-scale artificially structured channels of low pinning which simulate microstructures in technical superconductors. Our observations uniquely demonstrate the role of the grain morphology for flux pinning in polycrystalline materials. The results are in very good agreement with a continuum model for the shear-limited pinning force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99367
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Quantum critical behaviour in a high- T c superconductor (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 271-274 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Quantum criticality is associated with a system composed of a nearly infinite number of interacting quantum degrees of freedom at zero temperature, and it implies that the system looks on average the same regardless of the time- and length scale on which it is observed. Electrons on the atomic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01978
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Collective and plastic vortex motion in superconductors at high flux densities (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 399 (1999), S. 665-668 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ‘mixed state’ of type II superconductors occurs when magnetic flux penetrates the material (in the form of vortices) without destroying the superconducting ground state. Zero resistivity is retained if the vortices are pinned by crystalline defects, but is destroyed by vortex ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/21385
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Attractive vortices (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 192-194 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RESEARCH into high-temperature superconductivity continues to generate surprises. The latest, discovered by Gammel, Bishop and collaborators1, is that the lines of magnetic flux that thread the superconductors, when subjected to a magnetic field, can align themselves into regularly spaced chains. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/350192b0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Direct observation of magnetic flux lattice melting and decomposition in the high- T c superconductor Bi 2.15 Sr 1.95 CaCu 2 O 8+x (1993)
    [s.l.] : Nature Publishing Group
    Nature 365 (1993), S. 407-411 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The flux line lattice inside a single crystal of Bi2.15Sr1.95CaCu2O8+x has been observed using small-angle neutron diffraction. The diffracted intensity goes rapidly to zero at a magnetic-field-dependent flux lattice melting temperature; ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/365407a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Flux lattice makes a hesitant breakaway (1995)
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 729-730 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WHEN a viscoelastic medium is forced to move against random pinning forces, the two extreme stages of the process are clear. When our attempts are weak, the pinning forces will win and the medium will only respond elastically. When we push hard enough, the medium will flow uniformly and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/376729a0
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Characterization of defects in amorphous type II superconductors using the collective flux pinning properties (1988)
    Springer
    Journal of low temperature physics 70 (1988), S. 253-277 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As in crystalline materials, flux pinning in type II superconducting metallic glasses arises from the interaction of the flux-line lattice with defects that locally change the superconducting properties of the sample. The nature of these defects is still subject of numerous investigations. In this paper we demonstrate that the collective pinning properties of weak pinning, type II superconductors provide an ideal additional tool for probing defects of sizes comparable to the coherence length ξ. Our results obtained from sputtered Nb X Ge and Mo X Si layers sketch a straightforward relation between the sputter conditions, the resulting defects, and the pinning behavior. A classification of the defects that provide the pinning is given and estimates on their sizes and densities are derived. They are in excellent agreement with other (direct) observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682782
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Computations on the dimensional crossover in collective pinning (1987)
    Springer
    Journal of low temperature physics 67 (1987), S. 1-15 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The displacement correlation function introduced by Larkin and Ovchinnikov for pinned flux lines in a superconducting layer is evaluated explicitly in order to study the thickness dependence. Expressions for the transverse and longitudinal correlation lengthsR c andL care derived and a criterion for the crossover from two- to three-dimensional collective pinning is obtained. Using these expressions, computations are carried out for amorphous superconductors.L cturns out to drop exponentially fast in three dimensions, whileR cchanges gradually through the crossover remaining close to its 2D value. The explicit thickness dependence is logarithmic, so that the pure 3D case is only accessible in a very limited experimental regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01070646
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The effect of neutron irradiation damage on the magnetic behavior of superconducting niobium in stationary fields (1974)
    Springer
    Journal of low temperature physics 16 (1974), S. 169-191 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of irradiation with fast neutrons (at reactor ambient temperatures up to doses of 1.5×1020 n/cm2) on the magnetic behavior in stationary fields of superconducting niobium samples has been studied. Surface effects have been removed by oxidation of the samples. Irradiation leads to an increase ofH c2, which disappears after annealing the samples at 400°C. Also, the irreversibility of the magnetization increases and a peak effect is induced in the magnetization curves. These effects, due to an increased bulk pinning, are rather small, except in the samples irradiated with the highest dose. Electron microscope pictures showed that this is due to the fact that only for the highest dose do the clusters of interstitials which are introduced in the sample by the irradiation form extended defects, with sizes larger than the coherence length ξ. A discussion is given of te surface barrier before and after irradiation, of theH c2 shift due to the irradiation, and of the increased irreversibility of the magnetization. It turns out that nearH c2 the irradiation damage has to be treated as line defects, rather than as point defects, whereas at lower fields neither the critical state formula of Labusch for point pinning nor that of Good and Kramer for line pinning describes the experimental results exactly, although the differences do not seem to be very dramatic. We conclude that in the lower field region a combination of point and line pinning occurs. The peak effect has been discussed in a foregoing paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655866
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...