Antisymmetric exchange and pseudo Jahn-Teller instability in spin-frustrated metal clusters

Boris S. Tsukerblat; Alex Tarantul; Achim Müller

doi:10.1016/j.molstruc.2006.12.062

Antisymmetric exchange and pseudo Jahn-Teller instability in spin-frustrated metal clusters

Boris S. Tsukerblat, Alex Tarantul, Achim Müller

Department of Chemistry

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

27 Scopus citations

Abstract

In this article, we analyze the interplay between the antisymmetric (AS) exchange interaction and Jahn-Teller (JT) vibronic coupling in spin-frustrated systems with triangular units. AS exchange in these systems creates a strong first order magnetic anisotropy related to the orbitally degenerate frustrated ground state that is analyzed for the unique structure of the cluster anion present in K₆ [V₁₅^IV As₆ O₄₂ (H₂ O)] · 8 H₂ O (V₁₅ cluster) exhibiting layers of different magnetization. Spin-frustration inherently related to the orbital degeneracy creates a structural instability that is shown to be competitive to the AS exchange. The vibronic pseudo JT coupling arising from the modulation of the exchange interaction by the double degenerate molecular vibrations is shown to reduce AS exchange giving rise to a restoration of magnetization quenched by AS exchange. This leads to an essential reduction of the magnetic anisotropy in spin-frustrated triangular clusters so that in the limit of strong JT coupling the isotropic exchange model becomes adequate.

Original language	English
Pages (from-to)	124-132
Number of pages	9
Journal	Journal of Molecular Structure
Volume	838
Issue number	1-3
DOIs	https://doi.org/10.1016/j.molstruc.2006.12.062
State	Published - 16 Jul 2007

Keywords

Antisymmetric exchange
Jahn-Teller effect
Magnetic anisotropy
Molecular magnets
Spin-vibronic interaction
V cluster

ASJC Scopus subject areas

Analytical Chemistry
Spectroscopy
Organic Chemistry
Inorganic Chemistry

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10.1016/j.molstruc.2006.12.062

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@article{b21d134afff041e4817dca56090a70bb,

title = "Antisymmetric exchange and pseudo Jahn-Teller instability in spin-frustrated metal clusters",

abstract = "In this article, we analyze the interplay between the antisymmetric (AS) exchange interaction and Jahn-Teller (JT) vibronic coupling in spin-frustrated systems with triangular units. AS exchange in these systems creates a strong first order magnetic anisotropy related to the orbitally degenerate frustrated ground state that is analyzed for the unique structure of the cluster anion present in K6 [V15IV As6 O42 (H2 O)] · 8 H2 O (V15 cluster) exhibiting layers of different magnetization. Spin-frustration inherently related to the orbital degeneracy creates a structural instability that is shown to be competitive to the AS exchange. The vibronic pseudo JT coupling arising from the modulation of the exchange interaction by the double degenerate molecular vibrations is shown to reduce AS exchange giving rise to a restoration of magnetization quenched by AS exchange. This leads to an essential reduction of the magnetic anisotropy in spin-frustrated triangular clusters so that in the limit of strong JT coupling the isotropic exchange model becomes adequate.",

keywords = "Antisymmetric exchange, Jahn-Teller effect, Magnetic anisotropy, Molecular magnets, Spin-vibronic interaction, V cluster",

author = "Tsukerblat, \{Boris S.\} and Alex Tarantul and Achim M{\"u}ller",

note = "Funding Information: Financial support from the German-Israeli Foundation (GIF) for Scientific Research and Development (Grant G-775-19.10/2003) is gratefully acknowledged. We thank Dr. Oleg Reu for his help.",

year = "2007",

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doi = "10.1016/j.molstruc.2006.12.062",

language = "English",

volume = "838",

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T1 - Antisymmetric exchange and pseudo Jahn-Teller instability in spin-frustrated metal clusters

AU - Tsukerblat, Boris S.

AU - Tarantul, Alex

AU - Müller, Achim

N1 - Funding Information: Financial support from the German-Israeli Foundation (GIF) for Scientific Research and Development (Grant G-775-19.10/2003) is gratefully acknowledged. We thank Dr. Oleg Reu for his help.

PY - 2007/7/16

Y1 - 2007/7/16

N2 - In this article, we analyze the interplay between the antisymmetric (AS) exchange interaction and Jahn-Teller (JT) vibronic coupling in spin-frustrated systems with triangular units. AS exchange in these systems creates a strong first order magnetic anisotropy related to the orbitally degenerate frustrated ground state that is analyzed for the unique structure of the cluster anion present in K6 [V15IV As6 O42 (H2 O)] · 8 H2 O (V15 cluster) exhibiting layers of different magnetization. Spin-frustration inherently related to the orbital degeneracy creates a structural instability that is shown to be competitive to the AS exchange. The vibronic pseudo JT coupling arising from the modulation of the exchange interaction by the double degenerate molecular vibrations is shown to reduce AS exchange giving rise to a restoration of magnetization quenched by AS exchange. This leads to an essential reduction of the magnetic anisotropy in spin-frustrated triangular clusters so that in the limit of strong JT coupling the isotropic exchange model becomes adequate.

AB - In this article, we analyze the interplay between the antisymmetric (AS) exchange interaction and Jahn-Teller (JT) vibronic coupling in spin-frustrated systems with triangular units. AS exchange in these systems creates a strong first order magnetic anisotropy related to the orbitally degenerate frustrated ground state that is analyzed for the unique structure of the cluster anion present in K6 [V15IV As6 O42 (H2 O)] · 8 H2 O (V15 cluster) exhibiting layers of different magnetization. Spin-frustration inherently related to the orbital degeneracy creates a structural instability that is shown to be competitive to the AS exchange. The vibronic pseudo JT coupling arising from the modulation of the exchange interaction by the double degenerate molecular vibrations is shown to reduce AS exchange giving rise to a restoration of magnetization quenched by AS exchange. This leads to an essential reduction of the magnetic anisotropy in spin-frustrated triangular clusters so that in the limit of strong JT coupling the isotropic exchange model becomes adequate.

KW - Antisymmetric exchange

KW - Jahn-Teller effect

KW - Magnetic anisotropy

KW - Molecular magnets

KW - Spin-vibronic interaction

KW - V cluster

UR - https://www.scopus.com/pages/publications/34249326534

U2 - 10.1016/j.molstruc.2006.12.062

DO - 10.1016/j.molstruc.2006.12.062

M3 - Article

AN - SCOPUS:34249326534

SN - 0022-2860

VL - 838

SP - 124

EP - 132

JO - Journal of Molecular Structure

JF - Journal of Molecular Structure

IS - 1-3

ER -

Antisymmetric exchange and pseudo Jahn-Teller instability in spin-frustrated metal clusters

Abstract

Keywords

ASJC Scopus subject areas

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