| Issue |
Europhys. Lett.
Volume 62, Number 3, May 2003
|
|
|---|---|---|
| Page(s) | 439 - 445 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00415-5 | |
| Published online | 01 April 2003 | |
Spin precession in disordered systems: Anomalous relaxation due to heavy-tailed field distributions
1
Fachbereich Physik, Universität Konstanz - 78457
Konstanz, Germany
2
Institut für Physik, TU Ilmenau - 98684
Ilmenau, Germany
Received:
7
October
2002
Accepted:
27
February
2003
We investigate spin precession in the presence of randomly distributed magnetic moments which reorient by thermally activated transitions. Based on analytical calculations and scaling arguments, we find that the polarisation decay of a spin ensemble exhibits a rich behaviour characterised by stretched exponentials and power laws. The anomalous relaxation laws result from heavy-tailed local field distributions and are verified by computer simulations. The general problem is discussed in the context of μSR in random assemblies of superparamagnetic clusters.
PACS: 76.75.+i – Muon spin rotation and relaxation / 76.20.+q – General theory of resonances and relaxations / 76.60.Es – Relaxation effects
© EDP Sciences, 2003
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