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11.
Yaouanc A Dalmas De Reotier P Gygax FN Schenck A Amato A Baines C Gubbens PC Kaiser CT de Visser A Keizer RJ Huxley A Menovsky AA 《Physical review letters》2000,84(12):2702-2705
The magnetic response of the heavy fermion superconductor UPt3 has been investigated on a microscopic scale by muon Knight shift studies. Two distinct and isotropic Knight shifts have been found for the field in the basal plane. While the volume fractions associated with the two Knight shifts are approximately equal at low and high temperatures, they show a dramatic and opposite temperature dependence around T(N). Our results are independent on the precise muon localization site. We conclude that UPt3 is characterized by a two component magnetic response. 相似文献
12.
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
13.
H. Pinkvos F. N. Gygax A. Hoffheinz J. Menslage E. Lippelt A. Schenck Ch. Schwink 《Hyperfine Interactions》1986,31(1-4):363-368
Zero-field μSR provides clear evidence for a spatially inhomogeneous spin freezing in the spin glass systemCuMn. To test a spin glass with very different properties with respect to this characteristic, we investigatedCuMn samples doped with Au. The freezing process, as observed by μSR, was found unaffected. 相似文献
14.
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
15.
L.P. Le R.H. Heffner J.D. Thompson G.J. Nieuwenhuys D.E. Maclaughlin P.C. Canfield B.K. Cho A. Amato R. Feyerherm F.N. Gygax A. Schenck 《Hyperfine Interactions》1997,104(1-4):49-54
The muon‐spin‐relaxation technique has been utilized to characterize the magnetic properties of the borocarbide compounds
RNi2B2C ( R=\,Tm, Er, Ho and Dy), which exhibit coexistence of superconductivity and magnetism. Some general features of their magnetic
ground‐state and unusual results obtained in the Ho, Tm and Dy systems are discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
16.
17.
A. Grayevsky I. Felner T. Tashma N. Kaplan F. Gygax A. Amato M. Pinkpank A. Schenck 《Hyperfine Interactions》1997,104(1-4):73-78
As part of an ongoing μ+SR study on cubic van‐Vleck paramagnets of the PrM3 series ( M\ =\ In,Pb,Tl,Sn), in which the CEF level scheme varies systematically, we present preliminary static μ+SR results on a single crystal of PrIn3.
From the angular dependence and from the appearance of the μSR spectra, we could determine that stopped μ+ occupy octahedral sites of the (1/2, 0, 0) type, i.e. sites with 2 Pr and 4 In atoms as neighbors. The spectral frequency
shifts can be accounted for by assigning to the Pr sites essentially unperturbed 4f dipole moment values, as derived from
bulk magnetization measurements. The temperature dependence of the shifts scales to a good accuracy with the bulk susceptibility.
It is concluded that unlike previous observations with PrNi5, the local perturbations induced by an interstitial μ+ on the CEF levels of neighboring Pr in the PrIn3 system are small compared with the unperturbed level splitting itself.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
18.
A. Schenck A. Amato F.N. Gygax M. Pinkpank P. Ahmet M. Ablitz R. Settai Y. Ōnuki 《Hyperfine Interactions》1997,104(1-4):105-111
We report on ZF and TF‐studies of PrCu2 above the induced Jahn–Teller transition at 7.3 K. Generally a two‐component signal is found, one showing inhomogeneous the
other one homogeneous, temperature dependent line broadening. In ZF the former component is well represented by a Gaussian
Kubo–Toyabe function with \varDelta \simeq 6.5\,μs-1 at 7.5 K, corresponding to a field width of 76 G. This is about 30 times larger than what is calculated to arise from the
141Pr‐nuclear dipole moments alone, pointing to strong hyperfine enhanced features. TF‐field scans at 12 K revealed that the
enhancement is suppressed in external fields exceeding 1 kG. In parallel the Knight shift drops from very large values well
above 10% at 100 G to shifts of the order of 1% above 1 kG. A scaling of the Knight shifts with the corresponding relaxation
rates seems to imply that the strange field dependence below 1 kG is associated with the magnetic susceptibility of the muons’s
nearest neighbour Pr3+‐ions, a result for which we have no explanation yet to offer.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
Ruedi Gygax Jakob Wirz Joseph T. Sprague Norman L. Allinger 《Helvetica chimica acta》1977,60(8):2522-2529
The isodynamical interconversion between the quasiplanar equilibrium conformers 1b and 1c of 1,5-bisdehydro[12]annulene requires a free energy of activation ΔG# = 4.5 ± 0.2 kcal/mol (120 K) which was determined by line shape analysis of its temperature-dependent NMR. spectrum. Force field calculations indicate that this barrier reflects the energy needed to disrupt the cyclic π-conjugation in going to the nonplanar transition state 1a . 相似文献
20.