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26 April 2024

» pubmed » pmid16606220

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Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice
S Nakatsuji ; Y Machida ; Y Maeno ; T Tayama ; T Sakakibara ; J van Duijn ; L Balicas ; J N Millican ; R T Macaluso ; Julia Y Chan ;
Date:	3 Mar 2006
Journal:	Phys Rev Lett, 96 (8), 087204
Abstract:	Strongly frustrated magnetism of the metallic pyrochlore oxide Pr2Ir2O7 has been revealed by single crystal study. While Pr 4f moments have an antiferromagnetic RKKY interaction energy scale of /T/ = 20 K mediated by Ir 5d-conduction electrons, no magnetic long-range order is found except for partial spin freezing at 120 mK. Instead, the Kondo effect, including a lnT dependence in the resistivity, emerges and leads to a partial screening of the moments below /T/. Our results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K.
Source:	PubMed, pmid16606220
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