Nuclear orientation of recoil-implanted52Mn in Au down to 3 mK |
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Authors: | G Eska K Andres E Zech E Hagn |
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Affiliation: | (1) Zentralinstitut für Tieftemperaturforschung, Garching, West Germany;(2) Bell Laboratories, Murray Hill, New Jersey;(3) Physik Department, TU München, Garching, West Germany |
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Abstract: | Measurements of the -ray anisotropy of recoil-implanted52Mn ions in pure Au down to 3 mK indicate marked deviations from free-ion behavior in low applied fields. The effective hyperfine field that explains the anisotropy is found to decrease below 10 mK. Although this behavior could be a signature of a bound Kondon state with a lower effective hyperfine coupling constant, it is better explained as arising from a combination of Kondo and relaxation effects. The data indicate that the Mn local moment relaxation timeT
1 is comparable to or larger than the Larmor precession time of the Mn nuclei at 3 mK. Other possible reasons for an attenuated -ray anisotropy, such as nuclear quadrupole and second-order crystal field effects, are also considered.This work was supported by the Bundesministerium für Forschung und Technologie. |
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