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1.
2.
E. Maurer F. Hartmann F. Mylius F. Foerster G. Schoene H. Schenck Alexander Fischer G. T. Dougherty M. Dittrich A. Leonhard O. L. Barnebey J. V. Mc Crae R. L. Dowdell L. Jordan J. G. Thompson J. S. Acken J. H. S. Dickenson P. Herasymenko G. Pondélik Th. R. Cunningham R. J. Price C. H. Herty G. R. Fitterer J. E. Eckel J. J. Egan W. Crafts und A. B. Kinzel 《Fresenius' Journal of Analytical Chemistry》1935,101(1-2):50-53
Ohne Zusammenfassung 相似文献
3.
4.
S. Barth H. R. Ott F. N. Gygax B. Hitti E. Lippelt A. Schenck Z. Fisk 《Hyperfine Interactions》1989,50(1-4):709-716
μ+ SR-measurements in transversally applied magnetic fields of 2000 G and 4000 G on heavy-electron single crystal U2Zn17 are presented. They reveal that at least two types of interstitial sites are occupied by the positive muons. One of these
sites (1/3, 2/3, 5/6) could be identified via induced local dipolar fields which aboveT
N=9.7 K can exactly be derived from the magnetic susceptibility. The corresponding component of the μ+-signal exhibits a steplike decrease by about 40% atT
N which is caused by the onset of a very broad distribution of static internal magnetic fields (ΔB≈1000 G) with zero average. Such a field distribution is in distinct contrast to dipolar-field calculations performed for
the simple antiferromagnetic structure deduced from neutron diffraction. The remaining 60% of the muons contributing to this
component belowT
N are subject to a narrow static field distribution (ΔB≈1 G). The induced dipolar fields at the site (1/3, 2/3, 5/6) are temperature-independent belowT
N. A weak dipolar coupling to the U-moments renders similar observations for muons occupying the second type of interstitial
impossible. 相似文献
5.
Fr. Schenck M. Einhern P. Guttmann F. Hirschfeld J. Geyer A. Stadthagen und L. Brieger 《Fresenius' Journal of Analytical Chemistry》1890,29(1):378-380
Ohne Zusammenfassung 相似文献
6.
7.
L. Erlandsen G. Schenck H. Graf R. Wasicky G. Stern M. Zimet W. Schreber W. Hoffmann F. Schoofs V. F. Stewart H. J. Wollner J. R. Matchett und H. Quéré 《Fresenius' Journal of Analytical Chemistry》1940,120(3-4):147-151
Ohne Zusammenfassung 相似文献
8.
G. I. Weinberg S. Beninson H. Schenck W. Riess E. O. Brüggemann und P. I. Kirillow 《Fresenius' Journal of Analytical Chemistry》1936,107(1-2):50-51
Ohne Zusammenfassung 相似文献
9.
F. N. Gygax A. Schenck A. J. Van Der Wal R. Koch A. Winnacker 《Hyperfine Interactions》1986,32(1-4):511-520
The repolarization of μ+ in a longitudinal field as a function of field strength has been measured at various temperatures in KCl and KBr single crystals.
The data at room temperature in KCl are essentially in agreement with Ivanteret al. /1/ and Nishiyamaet al. /5/. The obtained quenching curves can be reasonably fitted by assuming that the long lived muonium state, seen directly
in transverse field experiments by Kieflet al. /4/, is preceded by another short lived muonium state with reduced hf-coupling. It is also necessary to allow for electron
spin exchange in the precursor state. The model fits yield the hyperfine frequency of the precursor state, its chemical lifetime
and an electron spin flip rate. It is speculated that the precursor state and the temperature dependence of the fitted parameters
reflect the early history of the μ+ in its terminal spur. 相似文献
10.
L. Asch S. Barth F. N. Gygax G. M. Kalvius A. Kratzer F. J. Litterst K. Mattenberger W. Potzel A. Schenck O. Vogt 《Hyperfine Interactions》1986,31(1-4):443-446
UAs has the NaCl structure and undergoes a first order transition into a type I (single k) antiferromagnetic state at 123
K, followed by a second first order transition at 62 K into a type IA (double k) antiferromagnetic structure. μSR spectra
of a powder sample were taken in zero and transverse fields up to 0.3 T. They cover the paramagnetic and the two antiferromagnetic
states. The most significant features of our data are: i) a first increase of relaxation rate below T=180 K; ii) a sudden
jump in both, relaxation rate and frequency shift at T=123 K, together with a small decrease in initial asymmetry (≈15%);
iii) no μ+ spin rotation in zero field in the type I state; iv) an overlay, of 3 spectra in the type IA state. Two of these spectra
show spin rotation in zero field. Their frequencies are clearly temperature dependent. In a transverse field of 5 and 10 mT
the external field adds nearly fully to the internal field.
Work supported in part by the Bundesministerium fur Forschung und Technologie, Federal Republic Germany. 相似文献