Control of L-type ferrimagnetism by the Ce/vacancy ordering in the A -site-ordered perovskite Ce1/2Cu3Ti4O12

Takashi Saito; Ryuta Yamada; Clemens Ritter; Mark S. Senn; J. Paul Attfield; Yuichi Shimakawa

doi:10.1021/ic402616r

Control of L-type ferrimagnetism by the Ce/vacancy ordering in the A -site-ordered perovskite Ce_1/2Cu₃Ti₄O₁₂

Takashi Saito^*, Ryuta Yamada, Clemens Ritter, Mark S. Senn, J. Paul Attfield, Yuichi Shimakawa

^*Corresponding author for this work

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

Abstract

A-site-ordered perovskite Ce1/2Cu3Ti 4O12 has been found to crystallize in two different forms, one with random and the other with ordered Ce/vacancy distribution at the A site of the prototype AA′3B4O12 structure. The random phase is isostructural with CaCu3Ti 4O12, and the ordered phase is a new ordered derivative of the AA′3B4O12-type perovskite with two crystallographically distinct Cu sites. Although both phases form a G-type antiferromagnetic arrangement of Cu2+ spins below 24 K, their magnetisms are quite different. A typical antiferromagnetic transition is observed in the random phase, whereas a small ferromagnetic moment appears below 24 K in the ordered phase, which rapidly decreases upon further cooling. A mean-field approximation approach revealed that this unusual behavior in the ordered phase is an L-type ferrimagnetism driven by the nonequivalent magnetizations of the two ferromagnetic Cu2+ spin sublattices in the G-type spin structure. This unusual ferrimagnetism is a direct consequence of the Ce/vacancy ordering.

Original language	English
Pages (from-to)	1578-1584
Number of pages	7
Journal	Inorganic Chemistry
Volume	53
Issue number	3
Early online date	21 Jan 2014
DOIs	https://doi.org/10.1021/ic402616r
Publication status	Published - 3 Feb 2014

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title = "Control of L-type ferrimagnetism by the Ce/vacancy ordering in the A -site-ordered perovskite Ce1/2Cu3Ti4O12",

abstract = "A-site-ordered perovskite Ce1/2Cu3Ti 4O12 has been found to crystallize in two different forms, one with random and the other with ordered Ce/vacancy distribution at the A site of the prototype AA′3B4O12 structure. The random phase is isostructural with CaCu3Ti 4O12, and the ordered phase is a new ordered derivative of the AA′3B4O12-type perovskite with two crystallographically distinct Cu sites. Although both phases form a G-type antiferromagnetic arrangement of Cu2+ spins below 24 K, their magnetisms are quite different. A typical antiferromagnetic transition is observed in the random phase, whereas a small ferromagnetic moment appears below 24 K in the ordered phase, which rapidly decreases upon further cooling. A mean-field approximation approach revealed that this unusual behavior in the ordered phase is an L-type ferrimagnetism driven by the nonequivalent magnetizations of the two ferromagnetic Cu2+ spin sublattices in the G-type spin structure. This unusual ferrimagnetism is a direct consequence of the Ce/vacancy ordering.",

author = "Takashi Saito and Ryuta Yamada and Clemens Ritter and Senn, {Mark S.} and Attfield, {J. Paul} and Yuichi Shimakawa",

year = "2014",

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doi = "10.1021/ic402616r",

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journal = "Inorganic Chemistry",

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T1 - Control of L-type ferrimagnetism by the Ce/vacancy ordering in the A -site-ordered perovskite Ce1/2Cu3Ti4O12

AU - Saito, Takashi

AU - Yamada, Ryuta

AU - Ritter, Clemens

AU - Senn, Mark S.

AU - Attfield, J. Paul

AU - Shimakawa, Yuichi

PY - 2014/2/3

Y1 - 2014/2/3

N2 - A-site-ordered perovskite Ce1/2Cu3Ti 4O12 has been found to crystallize in two different forms, one with random and the other with ordered Ce/vacancy distribution at the A site of the prototype AA′3B4O12 structure. The random phase is isostructural with CaCu3Ti 4O12, and the ordered phase is a new ordered derivative of the AA′3B4O12-type perovskite with two crystallographically distinct Cu sites. Although both phases form a G-type antiferromagnetic arrangement of Cu2+ spins below 24 K, their magnetisms are quite different. A typical antiferromagnetic transition is observed in the random phase, whereas a small ferromagnetic moment appears below 24 K in the ordered phase, which rapidly decreases upon further cooling. A mean-field approximation approach revealed that this unusual behavior in the ordered phase is an L-type ferrimagnetism driven by the nonequivalent magnetizations of the two ferromagnetic Cu2+ spin sublattices in the G-type spin structure. This unusual ferrimagnetism is a direct consequence of the Ce/vacancy ordering.

AB - A-site-ordered perovskite Ce1/2Cu3Ti 4O12 has been found to crystallize in two different forms, one with random and the other with ordered Ce/vacancy distribution at the A site of the prototype AA′3B4O12 structure. The random phase is isostructural with CaCu3Ti 4O12, and the ordered phase is a new ordered derivative of the AA′3B4O12-type perovskite with two crystallographically distinct Cu sites. Although both phases form a G-type antiferromagnetic arrangement of Cu2+ spins below 24 K, their magnetisms are quite different. A typical antiferromagnetic transition is observed in the random phase, whereas a small ferromagnetic moment appears below 24 K in the ordered phase, which rapidly decreases upon further cooling. A mean-field approximation approach revealed that this unusual behavior in the ordered phase is an L-type ferrimagnetism driven by the nonequivalent magnetizations of the two ferromagnetic Cu2+ spin sublattices in the G-type spin structure. This unusual ferrimagnetism is a direct consequence of the Ce/vacancy ordering.

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JO - Inorganic Chemistry

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Control of L-type ferrimagnetism by the Ce/vacancy ordering in the A -site-ordered perovskite Ce_1/2Cu₃Ti₄O₁₂

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