| Zugriffsnummer | 17013 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Dynamics of spin freezing in the re-entrant spin glass FeNiMn |
| Autor(in); Institution |
Wagner, Volker; 6.5, Neutronenstrahlung, PTB-Braunschweig
Hesse, Jürgen; TU Braunschweig, Institut für Metallphysik, Braunschweig, GERMANY
Klenke, Jens; Hahn-Meitner-Institut, Berlin, GERMANY
Pappas, Catherine; Hahn-Meitner-Institut, Berlin, GERMANY
|
| Quelle/Jahr | Proceedings of the Third European Conference on Neutron Scattering. Physica B: 350 (2004), 1-3, Suppl. 1, E1051 - E1054 |
| Herausgeber(in) |
Mutka, H.
|
| ISSN | 0921-4526 |
| DOI | |
| Verlag | Amsterdam [u.a.]: Elsevier |
| Konferenzangaben | European Conference on Neutron Scattering (ECNS'2003), Montpellier, 3-6, September, 2003, France |
| Klassifikationscode | PACS: 75.50.Lk ; PACS: 75.40.Gb ; PACS: 78.70.Nx |
| Freie Schlagworte | Re-entrant spin glass ; Spin dynamics ; Neutron spin echo ; FeNiMn |
| Zusammenfassung | For a polycrystalline sample of (Fe0.65Ni0.35)1-xMnx with x = 0.113 the intermediate scattering function s(Q, t) was observed by paramagnetic NSE techniques at scattering vectors 0.26 nm-1 ( Q ( 1.44 nm-1and at temperatures ranging from 120 K to 40 K, thus covering both the ferromagnetic phase and the RSG phase of the alloy. The normalized intermediate scattering function S(Q, t) =s(Q, t)/ s(Q) strongly depended on Q in the FM phase as would be expected. However, even in the mixed RSG phase the Q-dependence was appreciable, and thus it differed from the behaviour observed in classical spin glasses. It deviated from an exponential decay and was represented by a stretched exponential (with exponent n = 0.4 - 0.9 typically). The spin freezing, as observed by the increase of the inverse time constant, changed by more than two orders of magnitude between the onset of the RSG phase at 90 K and the strongly irreversible RSG phase at low temperature (≤ 50 K). |
