Field-Induced Spin-State Transition in LaCo^sub 1-x^M^sub x^O^sub 3^ (M = Al, Ga, Rh, and Ir)

We have investigated the high-field magnetization of lightly doped LaCo...M...O... with M = Al, Ga, Rh, and Ir up to 67 T. The transition field for the field-induced spin-state transition at 4.2 K, which is ...H... = 60 T in LaCoO..., increases slightly for M = Al but does not change for M = Ga. On...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2014-11, Vol.83 (11), p.1
Main Authors: Sato, Keisuke, Matsuo, Akira, Kindo, Koichi, Hara, Yoshiaki, Nakaoka, Kanichiro, Kobayashi, Yoshihiko, Asai, Kichizo
Format: Article
Language:English
Subjects:
Dependence
High temperature
Ions
Magnetism
Phase transitions
Volume
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Summary:We have investigated the high-field magnetization of lightly doped LaCo...M...O... with M = Al, Ga, Rh, and Ir up to 67 T. The transition field for the field-induced spin-state transition at 4.2 K, which is ...H... = 60 T in LaCoO..., increases slightly for M = Al but does not change for M = Ga. On the other hand, the transition field decreases remarkably for M = Rh and Ir. The substitution effect on ...H... has been interpreted as arising from the lattice-volume dependence of the excitation energy ... of Co... from the low-spin (LS) to high-spin (HS) state. The fraction of Co... is 15% of the total number of Co ions. The remaining Co ions, Co..., are excited from the LS to intermediate-spin (IS) state and contribute to the magnetization at high temperatures above 100 K. We propose the coexistence of the HS and IS states in LaCo...M...O... For M = Rh and Ir, Co species with the magnetic ground state, Co..., are populated by their substitution. The formation mechanism and spin states of Co... are discussed in comparison with those of the magnetic Co species in La...Sr...CoO... (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0031-9015
1347-4073