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  • 1990-1994  (3)
  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Chemical vapor deposition of the superconducting YBa2Cu3O7−x phase using halides as metal sources (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2476-2478 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown for the first time that the superconducting YBa2Cu3O7−x phase can be deposited by chemical vapor deposition using the halide precursors YCl3, BaI2, and CuCl as metal sources and an O2/H2O gas mixture. Sintered calcium stabilized zirconia plates were used as substrates. The superconductor was obtained upon deposition without the need for post-annealing. An ideal (001) texture was always found to prevail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101540
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Remanent magnetization in the diluted Ising antiferromagnet Fe0.6Zn0.4F2 : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5541-5543 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The field, H≤5 T, and temperature, T≥2 K, dependence of the remanent magnetization μ of the diluted Ising antiferromagnet Fe0.6Zn0.4F2 has been investigated utilizing a superconducting quantum interference device magnetometer. The results at low temperatures, where there is no growth of random field domains after the field removal, are analyzed according to μ=AHx(T ln t/t0)−Ψ+B, where the two terms are domain wall and volume contributions to the remanent magnetization, respectively. It is found that Ψ decreases continuously with decreasing temperature, and reaches a value of ≈0.15 at 3 K. The field exponent x is found to decrease with increasing temperature, attaining values between 2 and 3. The results show a more complex behavior of the low-temperature remanent magnetization than a model proposed by Nattermann and Vilfan which predicts constant values of the exponents: Ψ≈0.4 and x≈2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355682
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of YBa2Cu3O7−x films and YBa2Cu3O7−x/Y2O3 multilayers using coevaporation and atomic oxygen (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3096-3098 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin layers of YBa2Cu3O7−x (YBCO) deposited on LaAlO3 substrates have been prepared in situ by coevaporation of Y, Ba, and Cu. Incorporation of oxygen was accomplished by an atomic oxygen beam source with high cracking efficiency. The total oxygen flow at the substrate could be kept low enough to permit the use of a quadrupole mass spectrometer for evaporation rate monitoring. Films were strongly c-axis oriented with rocking curve full width at half-maximum values of 0.6°. Transport measurements on patterned films yielded critical current densities of 6×106 A/cm2 at 77 K. The deposition method was demonstrated to be feasible for preparation of Y2O3/YBCO heterostructures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352995
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental evidence for the existence of an overlap length in spin glasses (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5616-5618 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Zero-field-cooled magnetization measurements on a Cu(10 at.% Mn) spin glass are reported. The relaxation of the magnetization is recorded after specific temperature variations of the sample in the spin-glass phase. The data are discussed within the framework of new domain theories of the spin-glass phase. A qualitative agreement between the theoretical predictions and the experimental results is found. Specifically, empirical support for the theoretical concept overlap length is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342299
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Dimensionality crossover in CuMn spin-glass films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5252-5254 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamic properties of Cu (13.5 at. % Mn) spin-glass films of various thicknesses have been investigated in a superconducting quantum-interference device (SQUID) magnetometer. The films are produced in a dc-sputtering system and fabricated in the form of multilayer samples. Utilizing zero-field-cooled magnetization and ac-susceptibility measurements, the time-dependent susceptibility has been probed over eight decades in time (10−4–104 s). Drastic changes of the dynamics are found upon varying the film thickness from 104 to 20 A(ring). The most significant feature is a crossover from a behavior typical for bulk spin glasses for the 104-A(ring) film, with a finite critical temperature and a critical slowing down that can be accurately described by a conventional power-law divergence, to a slowing down for the very thin films that obeys a generalized Arrhenius law with a zero-temperature critical point. Thus, these measurements indicate a crossover from three- to two-dimensional spin-glass dynamics when one spatial dimension is gradually diminished to a finite size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344627
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Towards equilibrium in spin glasses (invited) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3371-3376 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New nonequilibrium features of the magnetic susceptibility of spin glasses are reviewed. Experimental observations on the time variation of the zero-field-cooled (ZFC) and field-cooled (FC) susceptibilities indicate that the same equilibrium value is obtained after the same characteristic time teq(T). ZFC and ac susceptibility measurements on metallic spin glasses unambiguously reveal the existence of aging of the zero-field spin-glass state. The possibility to probe the aging process from these measurements is outlined. The aging of the zero-field state ends at the characteristic time teq(T) , where a spin-glass state at dynamic equilibrium is retained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335101
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    Paper (German National Licenses)
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