Competition between heavy fermion and Kondo interaction in isoelectronic A-site-ordered perovskites

D. Meyers (), S. Middey, J.-G. Cheng, Swarnakamal Mukherjee, B. A. Gray, Yanwei Cao, J.-S. Zhou, J.B. Goodenough, Yongseong Choi, D. Haskel, J. W. Freeland, T. Saha-Dasgupta () and J. Chakhalian
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D. Meyers: University of Arkansas
S. Middey: University of Arkansas
J.-G. Cheng: Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences
Swarnakamal Mukherjee: S.N.Bose National Centre for Basic Sciences
B. A. Gray: University of Arkansas
Yanwei Cao: University of Arkansas
J.-S. Zhou: Texas Materials Institute, ETC 9.102, University of Texas at Austin
J.B. Goodenough: Texas Materials Institute, ETC 9.102, University of Texas at Austin
Yongseong Choi: Advanced Photon Source, Argonne National Laboratory
D. Haskel: Advanced Photon Source, Argonne National Laboratory
J. W. Freeland: Advanced Photon Source, Argonne National Laboratory
T. Saha-Dasgupta: S.N.Bose National Centre for Basic Sciences
J. Chakhalian: University of Arkansas

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract With current research efforts shifting towards the 4d and 5d transition metal oxides, understanding the evolution of the electronic and magnetic structure as one moves away from 3d materials is of critical importance. Here we perform X-ray spectroscopy and electronic structure calculations on A-site-ordered perovskites with Cu in the A-site and the B-sites descending along the ninth group of the periodic table to elucidate the emerging properties as d-orbitals change from partially filled 3d to 4d to 5d. The results show that when descending from Co to Ir, the charge transfers from the cuprate-like Zhang-Rice state on Cu to the t2g orbital of the B site. As the Cu d-orbital occupation approaches the Cu2+ limit, a mixed valence state in CaCu3Rh4O12 and heavy fermion state in CaCu3Ir4O12 are obtained. The investigated d-electron compounds are mapped onto the Doniach phase diagram of the competing RKKY and Kondo interactions developed for the f-electron systems.

Date: 2014
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DOI: 10.1038/ncomms6818

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