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

Tomoki Yamaguchi; Koudai Sugimoto; Yukinori Ohta

doi:10.1016/j.physb.2017.08.020

Multipole ordering and collective excitations in the excitonic phase of Pr_0.5Ca_0.5CoO₃

Tomoki Yamaguchi, Koudai Sugimoto, Yukinori Ohta

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

As an extension of our previous paper (Yamaguchi et al., 2017) [24], we study the carrier doping dependence of the excitonic condensation in Pr_0.5Ca_0.5CoO₃ 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.

Original language	English
Pages (from-to)	37-39
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	536
DOIs	https://doi.org/10.1016/j.physb.2017.08.020
Publication status	Published - 2018 May 1
Externally published	Yes

Keywords

Cobalt oxide
Collective mode
Excitonic phase
Magnetic multipole

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2017.08.020

Cite this

@article{1ee965252b894cbb8716f6af77165f20,

title = "Multipole ordering and collective excitations in the excitonic phase of Pr0.5Ca0.5CoO3 ",

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.",

keywords = "Cobalt oxide, Collective mode, Excitonic phase, Magnetic multipole",

author = "Tomoki Yamaguchi and Koudai Sugimoto and Yukinori Ohta",

note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = may,

day = "1",

doi = "10.1016/j.physb.2017.08.020",

language = "English",

volume = "536",

pages = "37--39",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

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TY - JOUR

T1 - Multipole ordering and collective excitations in the excitonic phase of Pr0.5Ca0.5CoO3

AU - Yamaguchi, Tomoki

AU - Sugimoto, Koudai

AU - Ohta, Yukinori

N1 - Funding Information: 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. Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - 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.

AB - 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.

KW - Cobalt oxide

KW - Collective mode

KW - Excitonic phase

KW - Magnetic multipole

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DO - 10.1016/j.physb.2017.08.020

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EP - 39

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

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