Regulating the metal-insulator transition of REBaCo ₂ O 5+ δ combining RE-substitution and anion control

Faqi Zhang; Yuchen Cui; Jingxin Gao; Hao Zhang; Yi Bian; Chen Liu; Nuofu Chen; Jikun Chen

doi:10.1039/d6ra00137h

January 1, 2026RSC AdvancesOpen Access

Regulating the metal-insulator transition of REBaCo ₂ O 5+ δ combining RE-substitution and anion control

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Key Points

The research aims to understand how changes in rare-earth (RE) substitution and anion control can influence metal-insulator transitions (MITs) in REBaCo2O5+δ.
Analyzed the impact of RE ionic radius on CoO6 octahedral distortion.
Examined how oxygen vacancies modulate Co valence state.
Investigated the relationship between structural symmetry and MIT occurrence.
Demonstrated a clear link between RE ionic radius and octahedral distortion effect on MIT.
Found that optimal oxygen vacancy levels lead to lower structural symmetry necessary for MIT.
Showed that δ values approaching 0.5 are critical for inducing abrupt MITs.

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Implication

Investigates the regulation of metal-insulator transitions in materials through strategic modifications, suggesting potential applications in advanced electronics.

Abstract

Enabling abrupt MITs for REBaCo 2 O 5+ δ relies on the synergistic coordination between the RE ionic radius-induced CoO 6 octahedral distortion and the oxygen vacancy-modulated Co valence state to reach a low structural symmetry, with δ approaching 0.5.

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Zhang et al. (2026) studied this question.

synapsesocial.com/papers/69c8c25dde0f0f753b39ca76 https://doi.org/10.1039/d6ra00137h

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Regulating the metal-insulator transition of REBaCo ₂ O 5+ δ combining RE-substitution and anion control

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Regulating the metal-insulator transition of REBaCo ₂ O 5+ δ combining RE-substitution and anion control

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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