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

S. Nakatsuji, Y. Machida, Y. Maeno, T. Tayama, T. Sakakibara, J. van Duijn, L. Balicas, J. N. Millican, R. T. Macaluso, and Julia Y. Chan
Phys. Rev. Lett. 96, 087204 – Published 3 March 2006

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*|=20K 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.

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  • Received 23 July 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.087204

©2006 American Physical Society

Authors & Affiliations

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

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Issue

Vol. 96, Iss. 8 — 3 March 2006

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