Spatial correlation study of internal magnetic fields in magnets by μSR2-technique |
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Authors: | V A Gordeev V N Gorelkin |
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Institution: | (1) Leningrad Nuclear Physics Institute, Academy of Sciences of the USSR, 188 350 Gatchina, Leningrad District, USSR;(2) Moscow Physical-Technical Institute, USSR |
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Abstract: | It is shown that using position-sensitive detectors in μSR experiments to determine the muon stopping site in a target permits
one to study correlation effects in μSR time histograms produced by the decay of muons stopping in the same domain, i.e. to
obtain time correlators of μSR histograms of decays from a small region. These correlators contain information on the spatial
correlation of magnetic fields in the sample under study. The proposed method (μSR2-technique) allows measuring correlation radii (r
c
) down to 10−5 cm in a bulk sample. Among interesting physical phenomena occuring overr
c≥3×10−6 cm are, for instance, long wavelength fluctuations of the order parameter near the phase transition point in ferromagnets
and antiferromagnets and magnetic field correlations in magnet domains and spin glasses. One may use this method also on heavy-current
accelerators producing pulsed muon beams to investigate the variation in time of spatial correlations in magnets, spin glasses
and superconductors. |
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Keywords: | |
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