Ga NMR study of the local susceptibility in SrCr8Ga4O19: pseudogap and paramagnetic defects

Details Ga NMR study of the local susceptibility in SrCr8Ga4O19: pseudogap and paramagnetic defects Ga NMR study of the local susceptibility in SrCr8Ga4O19: pseudogap and paramagnetic defects

2000-04-05

arxiv.org/abs/cond-mat/0004077v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.3496

We present the first Ga(4f) NMR study of the Cr susceptibility in the archetype of Kagome based frustrated antiferromagnets, SrCr$_{8}$Ga$_{4}$O$_{19}$. Our major finding is that the susceptibility of the frustrated lattice goes through a maximum around 50 K. Our data also supports the existence of paramagnetic ``clusters'' of spins, responsible for the Curie behavior observed in the macroscopic susceptibility at low T. These results set novel features for the constantly debated physics of geometrically frustrated magnets.

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