| Zugriffsnummer | 20719 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Spin freezing in the re-entrant spin glass FeNiMn close to the frustration limit |
| Autor(in); Institution |
Pappas, Catherine; Hahn-Meitner-Institut, Berlin, GERMANY
Klenke, Jens; Hahn-Meitner-Institut, Berlin, GERMANY
Hesse, Jürgen; TU Braunschweig, Institut für Metallphysik und Nukleare Festkörperphysik, Braunschweig, GERMANY
Wagner, Volker; 6.5, Neutronenstrahlung, PTB-Braunschweig; PTB-Braunschweig, retired staff
|
| Quelle/Jahr | Proceedings of the Sixth International Workshop on Polarised Neutrons for Condensed Matter Investigations. Physica B: 397 (2007), 1/2, 105 - 107 |
| ISSN | 0921-4526 |
| DOI | |
| Verlag | Amsterdam: Elsevier |
| Konferenzangaben | Sixth International Workshop on Polarised Neutrons for Condensed Matter Investigations (PNCMI), Berlin, 25-28, September, 2006, Germany |
| Klassifikationscode | PACS: 75.50.L ; PACS: 78.70.Nx ; PACS: 75.50.Bb |
| Freie Schlagworte | Re-entrant spin glass ; Spin freezing ; Neutron spin echo ; FeNiMn |
| Zusammenfassung | In the invar alloy (Fe0.65Ni0.35)1-x Mnx we measured the magnetic form factor s(Q) and the intermediate scattering function s(Q,t) for a sample close to the critical Mn concentration (Xc=0.139),at which the sample turns to a re-entrant spin glass phase. The aim was to check whether the magnetic behaviour would approach the Q-independent relaxation behaviour of a classical spin glass when x=xc. The experiment showed a quite similar spin freezing as for a more ferromagnetic sample with x=0.113. The intermediate scattering function and the form factor were determined by paramagnetic NSE. The normalized scattering function S(Q,t)=s(Q,t)/s(Q)=exp[(-γt)n] was fitted by stretched exponential decay. As a function of temperature T<200 K the inverse time constant γ showed the change of more than four orders of magnitude from frozen spin glass (T=60 K to T=100 K), where the ferromagnetic phase occured. In general the inverse time constant is higher than in the more ferromagnetic sample as the frustration of the spins became larger. In the ferromagnetic phase S(Q,t) depended on 0.3 |
