Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks

T. Hasegawa; Tomoyuki Akutagawa; T. Nakamura

doi:10.1016/S0379-6779(02)00364-8

Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks

T. Hasegawa, Tomoyuki Akutagawa, T. Nakamura

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl₂TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.

Original language	English
Pages (from-to)	623-625
Number of pages	3
Journal	Synthetic Metals
Volume	133-134
DOIs	https://doi.org/10.1016/S0379-6779(02)00364-8
Publication status	Published - 2003 Mar 13
Externally published	Yes
Event	ISCOM 2001 - Rusutsu, Hokkaido, Japan Duration: 2001 Sep 10 → 2001 Sep 14

Keywords

Mixed-stack complex
Neutral-ionic transition BEDT-TTF
Spin-lattice transition
TCNQ derivative

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0379-6779(02)00364-8

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title = "Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks",

abstract = "We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl2TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.",

keywords = "Mixed-stack complex, Neutral-ionic transition BEDT-TTF, Spin-lattice transition, TCNQ derivative",

author = "T. Hasegawa and Tomoyuki Akutagawa and T. Nakamura",

year = "2003",

month = mar,

day = "13",

doi = "10.1016/S0379-6779(02)00364-8",

language = "English",

volume = "133-134",

pages = "623--625",

journal = "Synthetic Metals",

issn = "0379-6779",

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note = "ISCOM 2001 ; Conference date: 10-09-2001 Through 14-09-2001",

}

TY - JOUR

T1 - Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks

AU - Hasegawa, T.

AU - Akutagawa, Tomoyuki

AU - Nakamura, T.

PY - 2003/3/13

Y1 - 2003/3/13

N2 - We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl2TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.

AB - We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl2TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.

KW - Mixed-stack complex

KW - Neutral-ionic transition BEDT-TTF

KW - Spin-lattice transition

KW - TCNQ derivative

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UR - http://www.scopus.com/inward/citedby.url?scp=0037435366&partnerID=8YFLogxK

U2 - 10.1016/S0379-6779(02)00364-8

DO - 10.1016/S0379-6779(02)00364-8

M3 - Conference article

AN - SCOPUS:0037435366

VL - 133-134

SP - 623

EP - 625

JO - Synthetic Metals

JF - Synthetic Metals

SN - 0379-6779

T2 - ISCOM 2001

Y2 - 10 September 2001 through 14 September 2001

ER -

Novel magneto-lattice transition in the mixed-stack charge-transfer complexes with inter-columnar networks

Abstract

Keywords

ASJC Scopus subject areas

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