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  • American Institute of Physics (AIP)  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 989-991 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the measurement of an anisotropy constant ||K1||∼1010 ergs/cm3 in the cubic uranium compound US at 0 K. This is over an order of magnitude greater than that in TbFe2, which has the largest known K1 of a cubic material. A novel method using the scattering of thermal neutrons has been used to determine K1. This measurement, together with our increased understanding of the interactions of 5f electron materials, has some practical implications for magnetic devices.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 882-884 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the powder-in-tube technique, superconducting monocore and multicore wires have been produced with several outer diameters (the thinnest one was (1)/(10) mm) and a length of more than 1000 m. The procedure was optimized for achieving high-transport current density. Three parameters were varied, namely, wire diameter, sinter duration, and sinter temperature. The most powerful wire prepared had a critical transport current density of 750 A/cm2.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7446-7451 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silver-sheathed Bi2Sr2CaCu2Ox wires and tapes were fabricated by the powder-in-tube method. The wires show critical current densities of about 18 000 A/cm2 in zero magnetic field and 5300 A/cm2 in a field of 23 T at 4.2 K, respectively. A detailed study of the critical current density as a function of the temperature and the magnetic field resulted in a scaling behavior of the derived volume pinning force FV, which approximately obeys the formula FV≈H*h0.75(1−h)2.75. Here H* represents the irreversible field and h=H/H* is the scaling field. Further, the critical current densities of our textured tapes were measured. In zero magnetic field they reach critical current densities of about 43 000 A/cm2. In a magnetic field applied perpendicularly to the current direction the critical current density shows an anisotropic behavior with respect to the direction of the magnetic field. For a magnetic field of 23 T applied parallel to the tape plane the tapes reached critical current densities of about 15 000 A/cm2 at 4.2 K. In the unfavorable direction, the magnetic field is applied perpendicularly to the tape plane, the current density was reduced to 10 000 A/cm2. The volume pinning force in the tapes was investigated versus the magnetic field at 4.2 K and a power-law behavior FV≈Hp with p=0.75 for H parallel and p=0.55 for H perpendicular to the tape plane was found. © 1994 American Institute of Physics.
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Uranium compounds can have an anisotropy that is considerably greater than that found in rare-earth compounds. Early estimates of K1 in ferromagnetic US (Tc = 178 K), for example, were that K1 (approximately-greater-than) 108 erg/cm3. We have re-examined this cubic material and determined K1 in the range of reduced moment (μ/μ0) from 0.1 〈 (μ/μ0) 〈 0.7 and find that it varies logarithmically over almost three orders of magnitude. The highest measured K1 is 2 × 108 erg/cm3 at (μ/μ0) = 0.7, but an extrapolation, which we anticipate on arguments of symmetry, to (μ/μ0)=1, (T=0 K) gives K1 ∼ 1010 erg/cm3, some 20 times more than found in TbFe2 at 0 K. The method we have used is with polarized neutrons. Because the neutron interaction with the magnetic moment is vectorial in nature we can determine individually the magnitude and direction of the moment in an applied field. In many cases this method has advantages over conventional methods, especially when the anisotropy is large.
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1030-1032 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the powder-in-tube technique superconducting 19-core wires have been produced with several diameters (down to 1/10 mm) and a length of some hundred meters. These wires show critical current densities of about 13500 A/cm2 in zero magnetic field and 6000 A/cm2 in a parallel field of 10 T at 4.2 K, respectively. For high magnetic field application it is necessary to understand the flux pinning mechanism. For this purpose the dissipative flux motion below Tc has been studied. The results of dc measurements were parametrized in the framework of flux creep. Using the Anderson model [published in Phys. Rev. Lett. 9, 309 (1962)], we find an activation energy inversely proportional to the square root of the magnetic field.
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