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Title: Orbitally Driven Spin-singlet Dimerization in S=1 La4Ru2O10

Abstract

Using x-ray absorption spectroscopy at the Ru-L2,3 edge wereveal that the Ru4+ ions remain in the S=1 spin state across the rare4d-orbital ordering transition and spin-gap formation. We find usinglocal spin density approximation + Hubbard U band structure calculationsthat the crystal fields in the lowtemperature phase are not strong enoughto stabilize the S=0 state. Instead, we identify a distinct orbitalordering with a significant anisotropy of the antiferromagnetic exchangecouplings. We conclude that La4Ru2O10 appears to be a novel material inwhich the orbital physics drives the formation of spin-singlet dimers ina quasi-two-dimensional S=1 system.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
COLLABORATION - U.Cologne
OSTI Identifier:
922810
Report Number(s):
LBNL-60893
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: 0; BnR: YN0100000; TRN: US0801171
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Related Information: Journal Publication Date: 06/30/2006
Country of Publication:
United States
Language:
English
Subject:
75; ABSORPTION SPECTROSCOPY; ANISOTROPY; APPROXIMATIONS; CRYSTAL FIELD; DIMERIZATION; DIMERS; PHYSICS; SPIN; transition metal oxide La4Ru2O10 dimerization

Citation Formats

Wu, Hua., Hu, Z., Burnus, T., Denlinger, J.D., Khalifah, P.G., Mandrus, D.G., Jang, L.-Y., Hseih, H.H., Tanaka, A., Liang, K.S., Allen,J.W., Cava, R.J., Khomskii, D.I., and Tjeng, L.H.. Orbitally Driven Spin-singlet Dimerization in S=1 La4Ru2O10. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.256402.
Wu, Hua., Hu, Z., Burnus, T., Denlinger, J.D., Khalifah, P.G., Mandrus, D.G., Jang, L.-Y., Hseih, H.H., Tanaka, A., Liang, K.S., Allen,J.W., Cava, R.J., Khomskii, D.I., & Tjeng, L.H.. Orbitally Driven Spin-singlet Dimerization in S=1 La4Ru2O10. United States. doi:10.1103/PhysRevLett.96.256402.
Wu, Hua., Hu, Z., Burnus, T., Denlinger, J.D., Khalifah, P.G., Mandrus, D.G., Jang, L.-Y., Hseih, H.H., Tanaka, A., Liang, K.S., Allen,J.W., Cava, R.J., Khomskii, D.I., and Tjeng, L.H.. Fri . "Orbitally Driven Spin-singlet Dimerization in S=1 La4Ru2O10". United States. doi:10.1103/PhysRevLett.96.256402.
@article{osti_922810,
title = {Orbitally Driven Spin-singlet Dimerization in S=1 La4Ru2O10},
author = {Wu, Hua. and Hu, Z. and Burnus, T. and Denlinger, J.D. and Khalifah, P.G. and Mandrus, D.G. and Jang, L.-Y. and Hseih, H.H. and Tanaka, A. and Liang, K.S. and Allen,J.W. and Cava, R.J. and Khomskii, D.I. and Tjeng, L.H.},
abstractNote = {Using x-ray absorption spectroscopy at the Ru-L2,3 edge wereveal that the Ru4+ ions remain in the S=1 spin state across the rare4d-orbital ordering transition and spin-gap formation. We find usinglocal spin density approximation + Hubbard U band structure calculationsthat the crystal fields in the lowtemperature phase are not strong enoughto stabilize the S=0 state. Instead, we identify a distinct orbitalordering with a significant anisotropy of the antiferromagnetic exchangecouplings. We conclude that La4Ru2O10 appears to be a novel material inwhich the orbital physics drives the formation of spin-singlet dimers ina quasi-two-dimensional S=1 system.},
doi = {10.1103/PhysRevLett.96.256402},
journal = {Physical Review Letters},
number = ,
volume = 96,
place = {United States},
year = {Fri Jan 13 00:00:00 EST 2006},
month = {Fri Jan 13 00:00:00 EST 2006}
}
  • Using x-ray absorption spectroscopy at the Ru-L{sub 2,3} edge we reveal that the Ru{sup 4+} ions remain in the S=1 spin state across the rare 4d-orbital ordering transition and spin-gap formation. We find using local spin density approximation+Hubbard U band structure calculations that the crystal fields in the low-temperature phase are not strong enough to stabilize the S=0 state. Instead, we identify a distinct orbital ordering with a significant anisotropy of the antiferromagnetic exchange couplings. We conclude that La{sub 4}Ru{sub 2}O{sub 10} appears to be a novel material in which the orbital physics drives the formation of spin-singlet dimers inmore » a quasi-two-dimensional S=1 system.« less
  • Motivated by recent neutron, x-ray absorption, and resonant scattering experiments, we revisit the electronic structure of V{sub 2}O {sub 3} . We propose a model in which S=1 V{sup 3+} ions are coupled in the vertical V-V pairs forming twofold orbitally degenerate configurations with S=2 . Ferro-orbital ordering of the V-V pairs gives a description which is consistent with all experiments in the antiferromagnetic insulating phase. (c) 2000 The American Physical Society.
  • No abstract prepared.
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  • The authors present predictions for the non-singlet Drell-Yan longitudinal spin cross sections and spin asymmetry, A{sub LL}, in proton-proton collisions at large p{sub T} at the RHIC energy of 200/GeV at next-to-leading order QCD. The higher order corrections to the non-singlet polarized cross section, {sigma}{sub NS}{sup LL}, are sizeable and similar to those found for the unpolarized cross section. The non-singlet asymmetry parameter, A{sup NS}{sub LL}, is very stable against higher order corrections and is a direct measurement of the non-singlet (i.e. valence) polarized quark distributions within the proton.