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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization studies of the influence of fast neutron irradiation on critical current density of melt-textured YBa2Cu3O7−x (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2102-2104 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The decrease of the magnetization hysteresis loop proportional to the decrease of the sample size was found for unirradiated and fast neutron irradiated bulk samples obtained from a powder melting process (PMP). This fact indicates that the superconducting current flows throughout the whole sample even when the magnetic field is applied. Thus, the critical current is not limited by field induced decoupling of the weak links. This is a consequence of specific microstructure of PMP samples. The increase of the critical current density by the factor of about 3 was observed after irradiation in magnetic field of 1 T in the examined temperature range from 60 to 85 K. The highest critical current density of the irradiated sample determined from magnetic measurements was equal to 5×104 A/cm2 in 1 T at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108319
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  • 2
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    Magnetocaloric effect in La1−xSrxMnO3 for x=0.13 and 0.16 (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1026-1028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization of polycrystalline La1−xSrxMnO3 samples with x=0.13 and x=0.16 has been measured as a function of temperature and external magnetic field. Using the gathered data and the thermodynamic Maxwell's relation, changes of the magnetic contribution to entropy under influence of the magnetic field, allowing to estimate the value of magnetocaloric effect, have been determined. The changes reach ∼7 J/(kg K) in the field of 7 T, which makes the studied samples good candidates for application for magnetic refrigeration. Expressions describing entropy and its change under influence of magnetic field have been derived in the molecular field approximation. Satisfactory agreement between the theoretical curves and the experimental dependencies has been found. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288671
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