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  • 1985-1989  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear microwave response to scanning fields in high-Tc oxides (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5800-5802 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonresonant microwave (MW) absorption is observed at the surface of high-Tc superconducting oxides in the presence of a static magnetic field and a scanning field. Nonlinear signals are obtained that show absorption troughs at the endpoints of the field scan superimposed on a hysteretic variation in absorption with field. The model of Portis et al. accounts quantitatively for the detailed shape of the observed signals. It enables the direct measurement of a critical field H*=(4π/c)Jcλ which depends on the critical current Jc and the static field penetration depth λ. In addition, the ratio λMW/λ is deduced from the shape of the troughs, with λMW the penetration depth of the MW fields. Typical values are H*(approximately-equal-to)5 μT and λMW(approximately-equal-to)3λ for a sintered YBaCuO sample at 77 K, and nearly the same H* but λMW(approximately-equal-to)λ at 4.2 K. Since the observed shapes also depend on the previous slow changes of the applied field, these investigations account for the memory effect observed with the usual resonance techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342209
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    μ+ SR studies on pure MnF2 and site-diluted (Mn0.5Zn0.5)F2SR studies on pure MnF2 and site-diluted (Mn0.5Zn0.5)F2 (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 313-318 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positive muon spin rotation and relaxation measurements have been carried out on the antiferromagnets, pure MnF2 and site-diluted (Mn0.5Zn0.5)F2, above and below the Néel temperature TN using single-crystal specimens. Two different muon signals have been found in the pure MnF2; with the precession frequency υA for the site A and υB for the site B measured in zero external magnetic field at T=5 K. We propose a picture that the signal from the A site represents the “muonium” state, and discuss the characteristic features of muonium in magnetic materials. The spin relaxation rate 1/T1, measured in zero external field, decreases rapidly with decreasing temperature below TN. The mechanism of the spin relaxation above TN is explained by the exchange fluctuations of the Mn moments, while below TN by the Raman scattering of spin waves. At the same normalized temperature T/TN, 1/T1 observed in the diluted (Mn0.5Zn0.5)F2 is significantly larger than that in the pure MnF2 below TN. The difference between the pure and diluted systems is related to the large spectral weight of low-energy magnons in (Mn0.5Zn0.5)F2 found by neutron scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401574
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Muon and other studies of magnetic ordering in cuprate layer-compounds (1989)
    Springer
    Hyperfine interactions 49 (1989), S. 129-165 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muon spin rotation studies of magnetic ordering in the planar cuprates are reviewed. Particular attention is given to doped La2CuO4 and oxygen-depleted YBa2Cu3O7-δ and to related experimental investigations. Studies of transition element substituted compounds are also reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405139
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electron wind-induced muon drift in metals (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 185-189 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A preliminary experiment was carried out by the present authors in collaboration with R. Keitel to search for electron wind-induced muon drift in copper at liquid helium temperatures. Drift was not observed, which is taken as support of Kondo's theory of nonadiabatic damping of light interstitials in metals. The present paper discusses the possibility of increased current and thinner foils and concludes that it should be possible with a carefully optimized experiment to detect muon drift. Weak longitudinal fields do not appear to offer any advantage over the transverse fields in which the original experiment was performed. It is proposed to look for wind-induced drift through muon trapping. Aluminum with manganese trapping centers offers a favorable opportunity for observing drift in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401557
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    Paper (German National Licenses)
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