Theory of muon spin relaxation by critical fluctuations in antiferromagnetic salts |
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Authors: | Stephen W Lovesey |
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Institution: | (1) Rutherford-Appleton Laboratory, OX11 0QX Oxon, UK |
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Abstract: | Relaxation rates for positive muons implanted in antiferromagnetic salts are predicted on the basis of calculations performed
with a coupled-mode theory of critical fluctuations in isotropic and uniaxial magnets. Anisotropy suppresses fluctuations
transmitted by the isotropic (hyperfine) relaxation mechanism. The dipolar mechanism leads to a relaxation rate which increases
on lowering the temperature to the critical point; the predicted form, proportional to the critical correlation length, yields
the same temperature dependence as for the NMR linewidth. For a magnet with isotropic spin interactions, both contributions
(hyperfine and dipolar) to the relaxation rate diverge with a temperature dependence given by the square-root of the correlation
length. |
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Keywords: | |
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