[Zurück]

J.C. Tellez Blanco, R. Sato Turtelli, R. Grössinger, D. Givord, D. Eckert, A. Handstein, K.-H. Müller:
"High-field dicontinutiy in the magnetisation of SmCo₃Cu₂ and SmCo_2.5Cu_2.5";
Journal of Magnetism and Magnetic Materials, 238 (2002), S. 6 - 10.

High-field discontinuity in the magnetisation of SmCo3Cu2 and SmCo2.5Cu2.5

J. C. Téllez-Blancoa, R. Sato Turtelli [Corresponding Author Contact Information] , [E-mail The Corresponding Author] , a, R. Grössingera, D. Givordb, D. Eckertc, A. Handsteinc and K. -H. Müllerc

a Institut für Experimentalphysik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
b CNRS, Laboratoire Louis Néel, 25, Av. des Martyrs 38042 Grenoble Cedex, France
c IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany

Received 19 June 2001; revised 27 September 2001. Available online 19 October 2001.

Abstract

An unusual jump from low to high magnetisation in increasing applied field is observed in isotropic bulk Sm(CoCu)5 between 30 K and close to the Curie temperature. Clear hysteretic behaviour is detected in the magnetisation curves during a cycle of increasing and decreasing field. No anomaly appears in the magnetisation, if a field is applied along the magnetically easy axis in aligned powder and also in some as-cast bulk samples. Contrary to the discontinuity observed on RCo5 compounds with R atoms as Th and Ce, the critical field, where the transition occurs, increases with decreasing temperature. Therefore, the origin of the discontinuity is discussed in terms of an onset of a non-collinear magnetic structure.

Author Keywords: Hard magnetic materials; Critical phenomena; Critical field; High-field magnetisation; Magnetic transition

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