Evidence for complex magnetic order in U2Zn17: A μ+ SR studySR study |
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Authors: | S Barth H R Ott F N Gygax B Hitti E Lippelt A Schenck Z Fisk |
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Institution: | 1. Laboratorium für Festk?rperphysik, ETH H?nggerberg, CH-8093, Zürich, Switzerland 2. Institut für Mittelenergiephysik, ETH-Z, CH 5234, Villigen, Switzerland 3. Los Alamos National Laboratory, 87545, Los Alamos, New Mexico, USA
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Abstract: | 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. |
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