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Title: Universality in One Dimensional Orbital Wave Ordering in Spinel and Related Compounds: an Experimental Perspective

Abstract

Recent state-of-the-art crystallographic investigations of transition metal spinel compounds have revealed that the d-orbital charge carriers undergo ordering transitions with the formation of local 'molecular bonding' units such as dimers in MgTi{sub 2}O{sub 4}, octomers in CuIr{sub 2}S{sub 4}, and heptamers in AlV{sub 2}O{sub 4}. Herein, we provide a unifying scheme involving one-dimensional (1D) orbital wave (OW) ordering applicable to all of these spinels. The relative phase of the orbitals in the chains is shown to be crucial to the formation of different local units, and thus both the amplitude and phase of the OW play important roles. Examination of Horibe et al's (2006 Phys. Rev. Lett. 96 086406) structure for AlV{sub 2}O{sub 4} serves as the vehicle for developing the general behaviour for such orbital wave ordering. Ordered AlV{sub 2}O{sub 4} will be seen to organize into three equivalent chains in 2D Kagome planes coupled so as to form units of three dimer bonds. Three additional equivalent chains manifest a more complex tetramerization with three different charge states and two different bonding schemes. The OW ordering scheme developed is extended to other spinel and related compounds with local triangular transition metal coordination and partial filling of the t{sub 2g}-dmore » orbitals.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930548
Report Number(s):
BNL-80657-2008-JA
Journal ID: ISSN 1367-2630; TRN: US200904%%583
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: New Journal of Physics; Journal Volume: 9
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNESIUM OXIDES; TITANIUM OXIDES; COPPER SULFIDES; IRIDIUM COMPOUNDS; SULFIDES; ALUMINIUM OXIDES; VANADIUM OXIDES; ONE-DIMENSIONAL CALCULATIONS; ELECTRONIC STRUCTURE; CHARGE CARRIERS; SPINELS; TRANSITION ELEMENTS; national synchrotron light source

Citation Formats

Croft,M., Kiryukhin, V., Horibe, Y., and Cheong, S. Universality in One Dimensional Orbital Wave Ordering in Spinel and Related Compounds: an Experimental Perspective. United States: N. p., 2007. Web. doi:10.1088/1367-2630/9/4/086.
Croft,M., Kiryukhin, V., Horibe, Y., & Cheong, S. Universality in One Dimensional Orbital Wave Ordering in Spinel and Related Compounds: an Experimental Perspective. United States. doi:10.1088/1367-2630/9/4/086.
Croft,M., Kiryukhin, V., Horibe, Y., and Cheong, S. Mon . "Universality in One Dimensional Orbital Wave Ordering in Spinel and Related Compounds: an Experimental Perspective". United States. doi:10.1088/1367-2630/9/4/086.
@article{osti_930548,
title = {Universality in One Dimensional Orbital Wave Ordering in Spinel and Related Compounds: an Experimental Perspective},
author = {Croft,M. and Kiryukhin, V. and Horibe, Y. and Cheong, S.},
abstractNote = {Recent state-of-the-art crystallographic investigations of transition metal spinel compounds have revealed that the d-orbital charge carriers undergo ordering transitions with the formation of local 'molecular bonding' units such as dimers in MgTi{sub 2}O{sub 4}, octomers in CuIr{sub 2}S{sub 4}, and heptamers in AlV{sub 2}O{sub 4}. Herein, we provide a unifying scheme involving one-dimensional (1D) orbital wave (OW) ordering applicable to all of these spinels. The relative phase of the orbitals in the chains is shown to be crucial to the formation of different local units, and thus both the amplitude and phase of the OW play important roles. Examination of Horibe et al's (2006 Phys. Rev. Lett. 96 086406) structure for AlV{sub 2}O{sub 4} serves as the vehicle for developing the general behaviour for such orbital wave ordering. Ordered AlV{sub 2}O{sub 4} will be seen to organize into three equivalent chains in 2D Kagome planes coupled so as to form units of three dimer bonds. Three additional equivalent chains manifest a more complex tetramerization with three different charge states and two different bonding schemes. The OW ordering scheme developed is extended to other spinel and related compounds with local triangular transition metal coordination and partial filling of the t{sub 2g}-d orbitals.},
doi = {10.1088/1367-2630/9/4/086},
journal = {New Journal of Physics},
number = ,
volume = 9,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}