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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and structural phase transitions in UAu2Si2 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4810-4812 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report magnetic susceptibility, neutron, and x-ray diffraction measurements on polycrystalline UAu2Si2. Magnetic susceptibility data show the existence of two phases below 50 K. Since no superlattice neutron peaks were observed within the sensitivity of the apparatus we conclude that the system is not a canted ferromagnet, as was suggested earlier. On the basis of the temperature dependence of the neutron and x-ray intensity we discuss a possibility that UAu2Si2 undergoes two structural phase transitions, at 48 and at 18 K and that these transitions are correlated with the magnetic state of the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348238
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation of surface topography and flux pinning in superconducting YBaCuO films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5099-5102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface topography of YBa2Cu3O7 thin films prepared by pulsed laser deposition is studied by atomic force microscopy and scanning tunneling microscopy. The possible contributions from observed structural features to the critical current density Jc are discussed. It is shown that the contribution of the screw dislocations associated with some structures can be either repulsive or attractive, depending on the dominant pinning mechanism. At low magnetic fields (to about 0.25 kOe) these dislocations can account for the observed critical current density values (Jc(approximately-greater-than)1011 A/m2) while for larger fields the higher-density steplike growth structures can account for significant values of Jc. It is shown that the pinning strength associated with pinning at steps varies inversely with thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350612
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  • 3
    Electronic Resource
    Electronic Resource
    Mössbauer effect and magnetization studies of α-FeMn alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7524-7531 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The bcc phase of Fe-Mn alloys was studied by means of the Mössbauer effect, x-ray diffraction, thermogravimetry analysis, and magnetization measurements for Mn concent- rations up to 17.5 at.%. These alloys are disordered over this composition range and both the average hyperfine field and critical temperature (Tc) decrease with increasing Mn concentration. Above 5 at.% Mn about 3 at.% Ti was added to each sample in order to stabilize and retain the α-phase at room temperature. The HF distribution shows peaks spaced 24 kOe apart corresponding to the substitution of each Fe nearest neighbor by a Mn atom. From the magnetization measurements we have found that the mean magnetic moment decreases at a slow rate for Mn contents up to 11 at.% followed by a fast decrease for larger Mn concentration. The usual interpretation of a constant magnetic moment for Fe and a small one for Mn cannot be used to interpret the present results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349704
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic phase diagrams of UCu2Si2 and UNi2Si2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5218-5220 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization measurements performed on UCu2Si2 and UNi2Si2 are reported. The compound UCu2Si2 appears to undergo both an antiferromagnetic (AFM) transition at T≈107 K and a ferromagnetic (FM) transition at Tc≈103 K. While the second transition at Tc has already been reported, the AFM phase was apparently overlooked in earlier studies. The compound UNi2Si2 undergoes a transition at T≈97 K, which was previously shown to be AFM by neutron scattering; we present evidence for the occurrence of a FM state below the AFM transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344615
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in UNi2Si2 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4807-4809 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report neutron diffraction measurements on a single crystal of UNi2 Si2. Three magnetically ordering phases are observed below 123 K with the magnetic moment parallel to the c-axis in all three phases. The low temperature (T〈53 K) phase is a superposition of a commensurate spin density wave with wave vector q = (0 0 0.667±0.002) and a ferromagnetic ordered moment of 1.1±0.3μB, the intermediate (53 K〈T〈103 K) is a simple body-centered tetragonal antiferromagnet with an ordered magnetic moment of 1.8±0.2μB and the high-temperature phase is an incommensurate spin density wave with wave vector q = (0 0 0.744±0.002) at 110 K. The phase transitions at 53 and 103 K are first order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348237
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  • 6
    Electronic Resource
    Electronic Resource
    Giant magneto-optic rotation in amorphous uranium antimonide (invited) : 35th Annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4750-4755 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous U-Sb alloys in the vicinity of the composition U3Sb4 have magneto-optic Faraday rotations of + 2 × 106 deg/cm. This is the highest rotation of any amorphous ferromagnetic material. These alloys also have relatively high Curie temperatures of about 140 K with magnetic moments per uranium of up to 1.4μB. These properties are unexpected since it is known from intermetallic compounds that U atoms must be isolated from each other in order to develop a magnetic moment. In a concentrated random amorphous alloy, no magnetic moment on the uranium would be expected because of the high probability of uranium near neighbors. In the U-Sb amorphous alloys, however, there appears to be chemical short-range order which tends to favor Sb nearest neighbors for uranium. The amorphous U-Sb alloys have Kerr rotations of about −3°. This value is comparable in magnitude but opposite in sign to that of the single-crystal rock salt compound USb in the visible. In these amorphous alloys the Hall angle from the spontaneous Hall effect can be as much as 17°. Similar large magneto-optic and Hall coefficients have also been found in amorphous U-Bi, U-Sb-Mn, and U-Sb-Co alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348270
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  • 7
    Electronic Resource
    Electronic Resource
    Hall-array gradiometer for measurement of the magnetic induction vector in superconductors (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5471-5473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental technique for measuring the distribution of the normal and planar components of the magnetic induction near the surface of a superconducting sample is described. This technique utilizes a design of a double-layered Hall sensor array fabricated from a GaAs/AlGaAs heterostructure containing two parallel layers of a two-dimensional electron gas. Applications of this technique are demonstrated in measuring the current density distribution and in characterizing the flux creep process in a thin YBa2Cu3O7 crystal. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369865
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of large magneto-optical effects in amorphous UxSb1−x films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 730-732 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous films with the compositions UxSb1−x (for x between 0.2 and 0.8) prepared by magnetron sputtering show ferromagnetic properties with Curie temperatures as high as 135 K (for x=0.45) and ordered magnetic moments of about 1.5μB. Large positive Faraday rotation values of over 2×106 deg/cm and large negative Kerr rotation values of over 3° are reported. The values of Faraday rotation are correlated with a large Hall effect, having corresponding Hall angles of up to θH=17°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103601
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  • 9
    Electronic Resource
    Electronic Resource
    Flux creep characteristics in high-temperature superconductors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 680-682 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe the voltage-current characteristics of YBa2Cu3O7−δ epitaxial films within the flux creep model in a manner consistent with the resistive transition behavior. The magnitude of the activation energy, and its temperature and magnetic field dependences, are readily derived from the experimentally observed power law characteristics and show a (1−T/Tc)3/2 type of behavior near Tc. The activation energy is a nonlinear function of the current density and it enables the determination of the shape of the flux line potential well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103310
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  • 10
    Electronic Resource
    Electronic Resource
    Scaling of the magnetoresistance of UBe13 under pressure (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5613-5615 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report magnetoresistance measurements of the heavy electron compound UBe13 above the superconducting transition temperature Tc and below 4 K for pressures P up to 19 kbar and for magnetic fields H up to 9 T. We observe strong negative magnetoresistance at all pressures and temperatures. The resistivity ρ is quadratic in temperature T from Tc up to a maximum temperature of 1 K at 1 bar increasing to 2 K at 19 kbar. The slope of the T2 term decreases with both H and with P. We find that δ(H)≡−[ρ(H)−ρ(0)]/ρ(0) for a given pressure scales as a function of H/T and exhibits power-law behavior over one decade with an exponent of 1.7. In addition, δ(H) at high pressure shows this same power law over a more limited H/T range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342298
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