Possible helimagnetic order in Co<superscript>4+</superscript>-containing perovskites Sr<subscript>1−x</subscript>Ca<subscript>x</subscript>CoO<subscript>3</subscript>.
In: APL Materials, Jg. 10 (2022-11-01), Heft 11, S. 1-7
Online
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Zugriff:
We systematically synthesized perovskite-type oxides Sr 1−x Ca x CoO 3 containing unusually high valence Co 4+ ions by a high pressure technique and investigated the effect of systematic lattice change on the magnetic and electronic properties. As the Ca content x exceeds about 0.6, the structure changes from cubic to orthorhombic, which is supported by the first-principles calculations of enthalpy. Upon the orthorhombic distortion, the ground state remains to be apparently ferromagnetic, with a slight drop of the Curie temperature. Importantly, the compounds with x larger than 0.8 show antiferromagnetic behavior, with positive Weiss temperatures and nonlinear magnetization curves at the lowest temperature, implying that the ground state is non-collinear antiferromagnetic or helimagnetic. Considering the incoherent metallic behavior and the suppression of the electronic specific heat at the high x region, the possible emergence of a helimagnetic state in Sr 1−x Ca x CoO 3 is discussed in terms of the bandwidth narrowing and the double-exchange mechanism with the negative charge transfer energy, as well as the spin frustration, owing to the next-nearest neighbor interaction. [ABSTRACT FROM AUTHOR]
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Titel: |
Possible helimagnetic order in Co<superscript>4+</superscript>-containing perovskites Sr<subscript>1−x</subscript>Ca<subscript>x</subscript>CoO<subscript>3</subscript>.
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Autor/in / Beteiligte Person: | Takahashi, Hidefumi ; Onose, Masaho ; Kobayashi, Yasuhito ; Osaka, Takahiro ; Maeda, Soushi ; Miyake, Atsushi ; Tokunaga, Masashi ; Sagayama, Hajime ; Yamasaki, Yuichi ; Ishiwata, Shintaro |
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Zeitschrift: | APL Materials, Jg. 10 (2022-11-01), Heft 11, S. 1-7 |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 2166-532X (print) |
DOI: | 10.1063/5.0101473 |
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