Alladi Ramakrishnan Hall

Possible evidence for exotic spin-glass features due to geometrical frustration in metallic kagome lattices, R3Ru4Al12

E V Sampathkumaran

TIFR, Mumbai

The phenomenon of frustrated magnetism arising out of geometrical arrangement of magnetic ions is one of the modern topics of research in condensed matter physics. It is in general believed that the spin-glass behavior, if observed in such geometrically frustrated systems, is not intrinsic to this phenomenon, but due to finite disorder, in contrast to earlier proposals. In this talk, I will present novel magnetic behavior arising out of geometrical frustration in the intermetallics, R3Ru4Al12 (R= Rare-earths), in which the magnetic R ions are arranged in the form of a ‘kagome’ net. On the basis of observed systematics, we propose that spin-glass anomalies could be intrinsic, at least in this family, but could be of an exotic type.