New-type phase transition coupled with spin and charge in iron mixed-valence system

Norimichi Kojima; Miho Itoi; Yuuki Ono; Masashi Ohkubo; Yasuhiro Kobayashi; Makoto Seto

doi:10.1080/713738681

New-type phase transition coupled with spin and charge in iron mixed-valence system

Norimichi Kojima^*, Miho Itoi, Yuuki Ono, Masashi Ohkubo, Yasuhiro Kobayashi, Makoto Seto

^*Corresponding author for this work

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

Abstract

We have investigated the physical properties of (n-C_nH _2n+1)₄N [Fe^IIFe^III(dto) ₃](dto = C₂O₂S₂) by means of ⁵⁷Fe Mössbauer spectroscopy, magnetic susceptibility, and ESR. From the analysis of ⁵⁷Fe Mössbauer spectra and ESR signal, we have discovered a new type of first order phase transition around 120 K for (n-C_nH_2n+1)₄N Fe^IIFe ^III(dto)₃](n = 3, 4), where the charge transfer transition between Fe^II and Fe occurs reversibly. In the higher temperature phase, the Fe^III (S = 1/2) and Fe^II (S = 2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the Fe^III (S = 5/2) and Fe ^II(S = 0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition in this system. The ferromagnetic order is induced by the charge transfer interaction between the Fe^III (S = 5/2) and Fe^II (S = 0) sites.

Original language	English
Pages (from-to)	349-356
Number of pages	8
Journal	Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume	379
DOIs	https://doi.org/10.1080/713738681
Publication status	Published - 2002
Externally published	Yes

Keywords

Charge transfer
Ferromagnetism
Mixed valence
Phase transition
Spin crossover

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/713738681

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title = "New-type phase transition coupled with spin and charge in iron mixed-valence system",

abstract = "We have investigated the physical properties of (n-CnH 2n+1)4N [FeIIFeIII(dto) 3](dto = C2O2S2) by means of 57Fe M{\"o}ssbauer spectroscopy, magnetic susceptibility, and ESR. From the analysis of 57Fe M{\"o}ssbauer spectra and ESR signal, we have discovered a new type of first order phase transition around 120 K for (n-CnH2n+1)4N FeIIFe III(dto)3](n = 3, 4), where the charge transfer transition between FeII and Fe occurs reversibly. In the higher temperature phase, the FeIII (S = 1/2) and FeII (S = 2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the FeIII (S = 5/2) and Fe II(S = 0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition in this system. The ferromagnetic order is induced by the charge transfer interaction between the FeIII (S = 5/2) and FeII (S = 0) sites.",

keywords = "Charge transfer, Ferromagnetism, Mixed valence, Phase transition, Spin crossover",

author = "Norimichi Kojima and Miho Itoi and Yuuki Ono and Masashi Ohkubo and Yasuhiro Kobayashi and Makoto Seto",

year = "2002",

doi = "10.1080/713738681",

language = "English",

volume = "379",

pages = "349--356",

journal = "Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals",

issn = "1058-725X",

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TY - JOUR

T1 - New-type phase transition coupled with spin and charge in iron mixed-valence system

AU - Kojima, Norimichi

AU - Itoi, Miho

AU - Ono, Yuuki

AU - Ohkubo, Masashi

AU - Kobayashi, Yasuhiro

AU - Seto, Makoto

PY - 2002

Y1 - 2002

N2 - We have investigated the physical properties of (n-CnH 2n+1)4N [FeIIFeIII(dto) 3](dto = C2O2S2) by means of 57Fe Mössbauer spectroscopy, magnetic susceptibility, and ESR. From the analysis of 57Fe Mössbauer spectra and ESR signal, we have discovered a new type of first order phase transition around 120 K for (n-CnH2n+1)4N FeIIFe III(dto)3](n = 3, 4), where the charge transfer transition between FeII and Fe occurs reversibly. In the higher temperature phase, the FeIII (S = 1/2) and FeII (S = 2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the FeIII (S = 5/2) and Fe II(S = 0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition in this system. The ferromagnetic order is induced by the charge transfer interaction between the FeIII (S = 5/2) and FeII (S = 0) sites.

AB - We have investigated the physical properties of (n-CnH 2n+1)4N [FeIIFeIII(dto) 3](dto = C2O2S2) by means of 57Fe Mössbauer spectroscopy, magnetic susceptibility, and ESR. From the analysis of 57Fe Mössbauer spectra and ESR signal, we have discovered a new type of first order phase transition around 120 K for (n-CnH2n+1)4N FeIIFe III(dto)3](n = 3, 4), where the charge transfer transition between FeII and Fe occurs reversibly. In the higher temperature phase, the FeIII (S = 1/2) and FeII (S = 2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the FeIII (S = 5/2) and Fe II(S = 0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition in this system. The ferromagnetic order is induced by the charge transfer interaction between the FeIII (S = 5/2) and FeII (S = 0) sites.

KW - Charge transfer

KW - Ferromagnetism

KW - Mixed valence

KW - Phase transition

KW - Spin crossover

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JO - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals

ER -

New-type phase transition coupled with spin and charge in iron mixed-valence system

Abstract

Keywords

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