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  • 11
    Electronic Resource
    Electronic Resource
    Scaling properties of the anisotropic critical current density in bulk textured YBaCuO. Evidence toward a 3D flux line lattice (1993)
    Springer
    Journal of low temperature physics 91 (1993), S. 1-11 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured dc transport critical current densities of melt texture grown and magnetically melt textured bulk YBaCuO at 77 K and in magnetic field. A maximum value of over 31,000 A/cm2 is obtained with a field of 7 teslas applied parallel to the (a, b) planes. Over the rest of the angular range the critical current is shown to be determined mainly by thec-axis component of the applied field. Although this dependency is expected in the presence of two-dimensional vortices, in fact the data are shown to correspond better to the behavior expected of an anisotropic three-dimensional superconductor. These results are compared to magnetization measurements on the same samples. We show that when the field is directed close to the c-axis, superconducting transport currents flow at fields well above the field at which the irreversible magnetization disappears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00132086
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    The angular dependence of critical current densities in bulk magnetically melt textured YBaCuO in magnetic fields up to 20 teslas (1993)
    Springer
    Journal of low temperature physics 92 (1993), S. 295-305 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Bulk magnetically melt textured YBaCuO at 77 K shows critical current densities of up to 19000 A/cm2 in 20 teslas when the field is parallel to the(a, b) planes. The angular dependence ofJc is shown to support a recent interpretation of the high superconducting transport currents measured above the irreversibility line in terms of intrinsic surface superconductivity. The behavior when the field is applied very close to the(a, b) planes is shown to follow a two dimensional model meaning that the maximum current density is determined by thec-axis component of the applied field. The size and density of 211 inclusions are probably the main factors which determines the maximum critical current density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682293
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Calorimetric Study of CeRu2Ge2 Under Continuously Swept Hydrostatic Pressure up to 8 GPa (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 245-257 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have implemented AC calorimetric measurements in diamond anvil pressure cells. The range of pressure (0–20 GPa), the excellent hydrostatic conditions of solid 4He used as the pressure transmitting medium associated with the possibility of continuously tuning the pressure at low temperature makes this experiment ideally suited for investigating phase diagrams under pressure and in particular for studying the thermodynamics of correlated metals around a Quantum Critical Point (QCP) where magnetic order is suppressed at absolute zero temperature. We present here results on the heavy fermion compound CeRu2Ge2 up to 8 GPa and down to 2 K. The specific heat anomalies associated with the different magnetic phase transitions are clearly resolved, allowing a precise determination of the magnetic phase diagram. On approaching the QCP close to 7 GPa, we observe a striking broadening of the antiferromagnetic transition associated with an anomalous behavior of the signal phase which could correspond to a change in the nature of this transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004685711942
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  • 14
    Electronic Resource
    Electronic Resource
    Transport Measurements of the Heavy Fermion Superconductor CeCu2Si2 Under Pressure (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 113-126 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Superconducting and normal state properties of a single crystal of CeCu2Si2 have been investigated by resistivity measurements under hydrostatic pressure and magnetic field. The low temperature resistivity behaviour (ρ = ρ 0 + AT 2, which is observed up to a temperature T A) is considered within the self-consistent renormalized (SCR) spin fluctuation model. Contrary to the model predictions, the product AT 2 A increases on approaching the quantum critical point (QCP). The temperature dependence of the upper critical field is analyzed assuming strong coupling and an intermediate regime between the clean and dirty limits. Both the low temperature resistivity behaviour at high pressure and the parameters deduced from the fits of H c2 point to a pressure induced decrease of the quasi-particle effective mass m*. The anisotropy of the initial slope of H c2(T) and therefore that of the effective mass was found to change under pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004634721391
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    Paper (German National Licenses)
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