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  • Electronic Resource  (15)
  • 1985-1989  (15)
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  • Electronic Resource  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Muon spin relaxation in ErRh4B4 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3197-3199 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Data on zero-field μSR in ErRh4B4 are presented for temperatures from 4 to 300 K. Due to the large erbium moment, most of the muons have a relaxation time of less than 10 ns for temperatures below about 50 K. The data have been analyzed in terms of two distinct muon sites in the material. The deduced erbium relative fluctuation rate versus temperature is related to the crystalline electric field levels of erbium in the RERh4B4 structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335148
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of static magnetic order in electron-superconductors and their parent compounds (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 49-51 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The technique of positive muon spin rotation2 (jxSR) has been applied extensively to the study of high- Tc superconductors and related materials3"8. In solids, the positive muon serves as a sensitive probe of the internal magnetic fields at interstitial sites(s), where the muon resides. In an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338049a0
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  • 3
    Electronic Resource
    Electronic Resource
    Absence of magnetic order in (Ba, K)BiO 3 (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 151-152 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Muon spin precession signal observed a, in a non-superconducting specimen of (Ba, K)BiO3 at T = 3.4K by applying a transverse external magnetic field Hext= 125 G, and b, in an anti-ferromagnetic YBa2Cu3C〉6 18 at T = 276 K with Hext = 100 G. The muon decay-time histogram is given as N(t) = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335151a0
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of high carbohydrate diets on endurance running performance (1988)
    Springer
    European journal of applied physiology 57 (1988), S. 698-706 
    Details
    ISSN: 1439-6327
    Keywords: Carbohydrate diets ; Endurance ; Running performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of the present study was to examine the influence of high carbohydrate (CHO) diets on recovery of endurance capacity following a treadmill run to exhaustion. Two high CHO diets were used, one in which the normal diet was supplemented with complex carbohydrates and the other in which supplementation was achieved with simple carbohydrates. The thirty recreational runners who took part in this study (fifteen men and fifteen women) completed weighed food intake diaries two to three weeks before the start of the study. From an analysis of this information each subject's ‘normal diet’ was prescribed before Trial 1 and then a supplemented diet before Trial 2. The aim was to achieve an increase in carbohydrate content to 70% in the diets of the two high CHO groups and an equivalent increase in energy intake by the Control group. The subjects were required to run to exhaustion on a treadmill at a speed equivalent to 70% $$\dot V_{{\text{O}}_{{\text{2max}}} } $$ on two occasions separated by 3 days. After Trial 1 the subjects were divided into three equal groups. The Complex CHO group (301±86 mg vs 507±120 mg) and Simple CHO group (265±45 mg vs 462±81 mg) increased their CHO intake by approximately 70% (p〈0.05) during the 3 days before Trial 2 whereas the Control group increased their energy intake with additional protein and fat so as to match the energy intakes of the two CHO groups. The Complex CHO group improved their running time to exhaustion during Trial 2 by 26% (105.9±22.4 to 133.3±46.5 min;p〈0.01) and the Simple CHO group increased their run time by 23% (114.5±15.6 to 140.6±27.0 min;p〈0.01) whereas there was no significant increase in the running time of the Control group (119±19.5 to 122.4±22.4 min). There was no significant difference between the blood lactate and glucose concentrations during the two trials but the plasma FFA concentrations were significantly lower before Trial 2 for the Complex CHO group (0.41±0.15 vs 0.27±0.16 mmol−1;p〈0.01) and the Simple CHO group (0.24±0.13 vs 0.19±0.09 mmol−1). The respiratory exchange ratios for the two CHO groups were significantly higher for most of Trial 2 compared with the values obtained during Trial 1. The results of this study have shown that recovery of endurance running capacity is enhanced by an increase in dietary CHO, which can be accomplished by supplementing the normal diet with either simple or complex carbohydrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01075991
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  • 5
    Electronic Resource
    Electronic Resource
    Spin dynamics in crystalline and amorphous DyAg (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 303-308 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Crystalline (cr-) Dyag [CsC] structure] orders antiferro-magnetically with TN≅60K; amorphous (am-) DyAg ferro-magnetically with TC≈-18K. We measured the longitudinal field (LF) μ+SR relaxation functions GZZ(t) for 5K〈T〈300K using surface muons. In the paramagnetic state. cr-DyAg gives an exponential GZZ (t) in the relaxation rate rising first slowly then more rapidlynear TN; no decoupling is observed in LF up to 0.4T. In the ordered state we see a Lorentzian Kubo-Toyabe GZZ(t), becoming nearly static at the lowest temperatures. Its static width is very narrow (Δ≈-7 MHz), and full dceoupling is achieved here in 0.1 T. On approaching TN, the fluctuation rate and the static width increase mootonically bt the field distribution remains Loratzian. A LF of 0.4T is then insufficient to quench the fast exponential relaxation. In paramagnetic am-DyAg, the μ+ depolarization is always much faster then in cr-DyAg. At lower temperatures it is better described by a root-exponential than an exponential GZZ(t). Below TC an exponentially relaxing signal with 1/3 amplitude is seen. The decoupling effect of LF up to 0.4T was negligible at all temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401572
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Thermally activated muonium formation in Al2O3 and BaF2 (1986)
    Springer
    Hyperfine interactions 32 (1986), S. 521-526 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Direct evidence is presented for thermally activated muonium formation in Al2O3 and BaF2. In each case the signature of the transition is a transverse field depolarization rate of the prompt diamagnetic component which is much too large to be attributable to muon-nuclear dipolar couplings. Longitudinal field decoupling measurements in Al2O3 support the interpretation that the initial diamagnetic fraction converts into a state with a stongly coupled electron —-i.e., muonium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394950
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  • 8
    Electronic Resource
    Electronic Resource
    μ+SR in amorphous spin glasses Pd75Fe5Si20 and Pd75Fe5P20 (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 381-387 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The zero-field muon spin relaxation functionG zz (t) has been measured as a function of reduced temperaturet=T/T g in the amorphous metallic spin glasses Pd75Fe5Si20 and Pd75Fe5P20. The results are in qualitative agreement with earlier measurements on dilute alloy spin glasses, including an onset of static order belowT g and a [t/(t-1)]2 dependence of the correlation time τc aboveT g. Both samples have the same τc (t) aboveT g and almost identical static width ΔS→Δo≃43 μS−1) asT»0, but thet-dependence of Δs nearT g differs markedly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401584
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  • 9
    Electronic Resource
    Electronic Resource
    Muon spin relaxation in CeCu2Si2 and muon knight shift in various heavy-fermion systems (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 413-418 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positive muon spin precession has been observed in various heavy-fermion systems in the transverse external magnetic field. In the superconductor CeCu2.1Si2, the relaxation rate of muon spins increases rapidly with decreasing temperature below TC. This is interpreted as the results of the inhomogeneous fields due to the imperfect penetration of the external field into the type-II superconducting state. The magnetic-field penetration depth λ is derived from the observed muon spin relaxation rate. λ is about 1200 ∢ at T∼0.5TC, and the temperature dependence of λ is consistent with the relation expected for a BCS superconductor. We have also measured the muon Knight shift Kμ in the normal (or paramagnetic) state of various heavy-fermion systems. Kμ is large and negative (about −1000∼−3000 ppm at T=10 K) for CeCu2Si2, UPt3 and CeAl3, while more complicated signals are measured in CePb3 and CeB6. The negative muon Knight shift in the non-magnetic heavy-fermion systems is discussed in terms of the Kondo-coupling between the conduction- and f-electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401589
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  • 10
    Electronic Resource
    Electronic Resource
    μ+knight shifts and trapping in diluteSbSn alloys (1986)
    Springer
    Hyperfine interactions 31 (1986), S. 433-437 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Giant μ+ Knight shifts Kμ have been studied previously in Sb andSbBi alloys. Here we report μ+SR measurements on Sb with dilute heterovalent Sn impurities. A dramatic concentration dependence is observed: Kμ is increased slightly (relative to the value in pure Sb) by Sn concentrations of 〈0.1%, whereas larger concentrations cause a drastic reduction of Kμ. One concern could be that Kμ values in the alloy might reflect local band structure in trap sites near Sn impurities rather than the bulk “host” band structure of the alloy. This is indeed the case in bothSbSn (0.03%) andSbSn (0.06%), where a second, lower frequency TF-μSR signal begins to appear for T〉60K. The amplitude of the low Kμ signal grows with increasing T at the expense of the amplitude of the high-Kμ, low-T signal, suggesting that the μ+ migrates through the host lattice to trap sites. A simple trapping model correctly describes the observed T-dependence of the amplitudes, phases and relaxation rates of the two signals. We conclude that the low-T Knight shift is truly characteristic of the host band structure while the much lower Kμ value of the high-T site is characteristic of a specific trap site, presumably adjacent to a Sn impurity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401592
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