Magnetic ordering in a supercooled Co-Pd melt studied by muon-spin rotation
Paul Scherrer Institut - CH-5232 Villigen PSI, Switzerland
2 Institut für Strahlen- und Kernphysik, Universität Bonn - D-53115 Bonn, Germany
3 Institut für Raumsimulation, Deutsches Zentrum für Luft- und Raumfahrt D-51140 Köln, Germany
Accepted: 6 August 1998
Liquid samples of were cooled below their liquidus temperature Tl and supercooled towards the paramagnetic-ferromagnetic transition temperature by means of the Electromagnetic Levitation (EML) technique. Muon-Spin Rotation () measurements were used to determine the spin precession frequency f and the transverse muon-spin relaxation rate Γ in the liquid supercooled sample at temperatures . Γ increases by a factor of 5 when T approaches , indicating large spin fluctuations caused by the onset of spontaneous magnetization. The temperature dependence of the inverse frequency shift reflects a Curie-Weiss behaviour of the paramagnetic susceptibility. The experiments strongly suggest the existence of ferromagnetic ordering in a liquid metal.
PACS: 75.50.Mm – Magnetic liquids / 75.90.+w – Other topics in magnetic properties and materials / 76.75.+i – Muon spin rotation and relaxation
© EDP Sciences, 1998