Possible Kondo physics near a metal-insulator crossover in the a-site ordered perovskite CaCu3Ir4O12

J-G Cheng; J-S Zhou; Y-F Yang; H D Zhou; K Matsubayashi; Y Uwatoko; A MacDonald; J B Goodenough

doi:10.1103/PhysRevLett.111.176403

Possible Kondo physics near a metal-insulator crossover in the a-site ordered perovskite CaCu3Ir4O12

Phys Rev Lett. 2013 Oct 25;111(17):176403. doi: 10.1103/PhysRevLett.111.176403. Epub 2013 Oct 23.

Authors

J-G Cheng¹, J-S Zhou, Y-F Yang, H D Zhou, K Matsubayashi, Y Uwatoko, A MacDonald, J B Goodenough

Affiliation

¹ Materials Science and Engineering Program and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA and Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan and Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

PMID: 24206506
DOI: 10.1103/PhysRevLett.111.176403

Abstract

The A-site ordered perovskite (AA(3)')B(4)O(12) can accommodate transition metals on both A' and B sites in the crystal structure. Because of this structural feature, it is possible to have narrow-band electrons interacting with broadband electrons from different sublattices. Here we report a new A-site ordered perovskite (CaCu(3))Ir(4)O(12) synthesized under high pressure. The coupling between localized spins on Cu(2+) and itinerant electrons from the Ir-O sublattice makes Kondo-like physics take place at a temperature as high as 80 K. Results from the local density approximation calculation have confirmed the relevant band structure. The magnetization anomaly found at 80 K can be well rationalized by the two-fluid model.