Elsevier

Physica B: Condensed Matter

Volume 536, 1 May 2018, Pages 37-39
Physica B: Condensed Matter

Multipole ordering and collective excitations in the excitonic phase of Pr0.5Ca0.5CoO3

https://doi.org/10.1016/j.physb.2017.08.020Get rights and content

Abstract

As an extension of our previous paper (Yamaguchi et al., 2017) [24], we study the carrier doping dependence of the excitonic condensation in Pr0.5Ca0.5CoO3 using the random-phase and mean-field approximations for the realistic five-orbital Hubbard model. We show that the spin-triplet excitonic phase with a magnetic multipole ordering is stable against the doping of carriers in a considerable range around Co3+ (or 3d6). We discuss experimental relevance of our results.

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Acknowledgment

We thank T. Kaneko and S. Miyakoshi for fruitful discussions. This work was supported in part by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (Nos. 26400349, 15H06093, and 17K05530). T. Y. acknowledges support from the Chiba University SEEDS Fund. The numerical calculations were carried out on computers in Yukawa Institute for Theoretical Physics, Kyoto University, Japan, and in Research Center for Computational Science, Okazaki, Japan.

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