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Spin dynamics in the reentrant spin glass ( Fe0.65 Ni0.35)1-x Mnx

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Abstract

The spin dynamics in the reentrant spin glass ( Fe0.65 Ni0.35)1-x Mn_x has been studied by zero, longitudinal and transverse field μSR. In the ferromagnetic reentrant and pure spin glass regimes (x\leqslant 0.175), zero field experiments reveal a stretched exponential muon relaxation with a universal behaviour of the dynamic exponent \beta above the spin glass transition. There are no qualitative differences between the ferromagnetic and paramagnetic phases. In transversal field μSR experiments the divergence of the relaxation rate close to the spin glass transition is suppressed for manganese doping up to x=0.113 but enhanced for slightly higher doping (x\geqslant 0.12). We understand this behaviour as a crossover from an itinerant to a more localized state of the 3d electron system. This is also supported by the fact that in the highly doped regime with dominant antiferromagnetic interactions the muon relaxation rate diverges above the antiferromagnetic transition temperature.

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Authors and Affiliations

  1. Institut für Metallphysik und Nukleare Festkörperphysik, Technische Universität Braunschweig, D‐38106, Braunschweig, Germany

    H.‐H. Klauß, M. Hillberg, W. Wagener, M.A.C. de Melo, F.J. Litterst, M. Fricke & J. Hesse

  2. Physik Department, Technische Universität München, D‐85748, Garching, Germany

    E. Schreier

Authors
  1. H.‐H. Klauß
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  2. M. Hillberg
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  3. W. Wagener
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  4. M.A.C. de Melo
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  5. F.J. Litterst
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  6. M. Fricke
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  7. J. Hesse
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  8. E. Schreier
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Klauß, H., Hillberg, M., Wagener, W. et al. Spin dynamics in the reentrant spin glass ( Fe0.65 Ni0.35)1-x Mnx . Hyperfine Interactions 104, 319–323 (1997). https://doi.org/10.1023/A:1012621119770

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  • DOI: https://doi.org/10.1023/A:1012621119770

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