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Phys. Rev. Lett. 96, 087204 (2006) [4 pages]

Metallic Spin-Liquid Behavior of the Geometrically Frustrated Kondo Lattice Pr2Ir2O7

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S. Nakatsuji1, Y. Machida1, Y. Maeno1,2, T. Tayama3, T. Sakakibara3, J. van Duijn4, L. Balicas5, J. N. Millican6, R. T. Macaluso6, and Julia Y. Chan6
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
2International Innovation Center, Kyoto University, Kyoto 606-8501, Japan
3Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa 277-8581, Japan
4ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
5National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA
6Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA

Received 23 July 2005; published 3 March 2006

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 ln⁡T 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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.087204
DOI:
10.1103/PhysRevLett.96.087204
PACS:
75.20.Hr, 75.40.Cx, 75.50.Ee
 
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