Jahn-Teller Transitions in the Fe(II)Fe(III) Bimetallic Oxalates

R. S. Fishman

doi:10.1007/978-94-007-2384-9_17

Jahn-Teller Transitions in the Fe(II)Fe(III) Bimetallic Oxalates

R. S. Fishman

Materials Theory

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

Because the orbital angular momentum L_z ^cf on the Fe(II) sites of the Fe(II)Fe(III) bimetallic oxalates is incompletely quenched by the crystal field, the spin-orbit coupling competes with the Jahn-Teller (JT) distortion energy. The value of L_z ^cf depends on the cation between the bimetallic layers. When L_z ^cf is sufficiently small, the open honeycomb lattice of each bimetallic layer is distorted at all temperatures below the JT transition temperature. But in a range of L_z ^cf, the lattice is only distorted between lower and upper JT transition temperatures, T_JT ^(l) and T_JT ^(u). For some cations, L_z ^cf may exceed the threshold required for the cancellation of the moments on the Fe(II) and Fe(III) sublattices at a temperature T_comp below the transition temperature T_c. Using elastic constants obtained from compounds that exhibit magnetic compensation, we find that T_JT ^(l) always lies between T_comp and T_c and that T_JT ^(u) always lies above T_c.

Original language	English
Title of host publication	Progress in Theoretical Chemistry and Physics
Publisher	Springer Nature
Pages	317-326
Number of pages	10
DOIs	https://doi.org/10.1007/978-94-007-2384-9_17
State	Published - 2012

Publication series

Name	Progress in Theoretical Chemistry and Physics
Volume	23
ISSN (Print)	1567-7354
ISSN (Electronic)	2215-0129

Funding

Acknowledgments I would like to acknowledge helpful conversations with Dr. Satoshi Okamoto. This research was sponsored by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.

Funders	Funder number
U.S. Department of Energy
Basic Energy Sciences
Division of Materials Sciences and Engineering

Keywords

Anharmonic Term
Crystal Field
Distortion Energy
Magnetic Order
Orbital Angular Momentum

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abstract = "Because the orbital angular momentum Lz cf on the Fe(II) sites of the Fe(II)Fe(III) bimetallic oxalates is incompletely quenched by the crystal field, the spin-orbit coupling competes with the Jahn-Teller (JT) distortion energy. The value of Lz cf depends on the cation between the bimetallic layers. When Lz cf is sufficiently small, the open honeycomb lattice of each bimetallic layer is distorted at all temperatures below the JT transition temperature. But in a range of Lz cf, the lattice is only distorted between lower and upper JT transition temperatures, TJT (l) and TJT (u). For some cations, Lz cf may exceed the threshold required for the cancellation of the moments on the Fe(II) and Fe(III) sublattices at a temperature Tcomp below the transition temperature Tc. Using elastic constants obtained from compounds that exhibit magnetic compensation, we find that TJT (l) always lies between Tcomp and Tc and that TJT (u) always lies above Tc.",

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N2 - Because the orbital angular momentum Lz cf on the Fe(II) sites of the Fe(II)Fe(III) bimetallic oxalates is incompletely quenched by the crystal field, the spin-orbit coupling competes with the Jahn-Teller (JT) distortion energy. The value of Lz cf depends on the cation between the bimetallic layers. When Lz cf is sufficiently small, the open honeycomb lattice of each bimetallic layer is distorted at all temperatures below the JT transition temperature. But in a range of Lz cf, the lattice is only distorted between lower and upper JT transition temperatures, TJT (l) and TJT (u). For some cations, Lz cf may exceed the threshold required for the cancellation of the moments on the Fe(II) and Fe(III) sublattices at a temperature Tcomp below the transition temperature Tc. Using elastic constants obtained from compounds that exhibit magnetic compensation, we find that TJT (l) always lies between Tcomp and Tc and that TJT (u) always lies above Tc.

AB - Because the orbital angular momentum Lz cf on the Fe(II) sites of the Fe(II)Fe(III) bimetallic oxalates is incompletely quenched by the crystal field, the spin-orbit coupling competes with the Jahn-Teller (JT) distortion energy. The value of Lz cf depends on the cation between the bimetallic layers. When Lz cf is sufficiently small, the open honeycomb lattice of each bimetallic layer is distorted at all temperatures below the JT transition temperature. But in a range of Lz cf, the lattice is only distorted between lower and upper JT transition temperatures, TJT (l) and TJT (u). For some cations, Lz cf may exceed the threshold required for the cancellation of the moments on the Fe(II) and Fe(III) sublattices at a temperature Tcomp below the transition temperature Tc. Using elastic constants obtained from compounds that exhibit magnetic compensation, we find that TJT (l) always lies between Tcomp and Tc and that TJT (u) always lies above Tc.

KW - Anharmonic Term

KW - Crystal Field

KW - Distortion Energy

KW - Magnetic Order

KW - Orbital Angular Momentum

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Jahn-Teller Transitions in the Fe(II)Fe(III) Bimetallic Oxalates

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