Dresden 2006 – scientific programme
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MA: Magnetismus
MA 19: Invited Talks Algarabel / Gutfleisch
MA 19.1: Invited Talk
Tuesday, March 28, 2006, 14:00–14:30, HSZ 03
Pressure and magnetic field effects on the magnetic and crystallographic structures of the R5(SixGe1-x)4 compounds — •Algarabel P. A.1, Morellon L.1, Magen C.1, Ibarra M. R.1, Ritter C.2, and Arnold Z.3 — 1Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Spain — 2Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble Cédex 9, France — 3Institute of Physics AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic
The astonishing properties discovered in the R5(SixGe1-x)4 rare-earth intermetallic materials have triggered a great research activity due to an exceptional magnetoresponsive behavior such as the giant magnetocaloric effect , strong magnetoelastic effects, and giant magnetoresistance. This phenomenology has been associated with the intrinsically sub-nanometer-layered crystallographic structure combined with a magnetic-martensitic first-order phase transformation. The strong magnetoelastic coupling responsible for these phenomena allows the magnetic-crystallographic transition to be reversibly induced by the change of external parameters such as temperature, external magnetic field, or hydrostatic pressure. A review of the most outstanding properties arising from the strong interplay between the crystallographic structure and magnetism in the system R5(SixGe1-x)4 (R=Gd, Tb, Er) is presented. In addition to compositional and magnetic-field effects, we will emphasize the significance of the hydrostatic pressure as a new control parameter of the properties of these compounds.