skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Orbitally Driven Spin-Singlet Dimerization in S=1 La 4Ru 2O 10

Abstract

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 in a quasi-two-dimensional S=1 system.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [4];  [5];  [6];  [4];  [7];  [8];  [1];  [1]
  1. Universitat zu Koln, Koln, Germany
  2. Lawrence Berkeley National Laboratory (LBNL)
  3. ORNL
  4. National Synchrotron Radiation Research Center, Hsinchu, Taiwan
  5. Chung Cheng Institute of Tech., National Defense University, Taiwan
  6. Hiroshima University, Japan
  7. University of Michigan
  8. Princeton University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978209
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 25
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ANISOTROPY; CRYSTAL FIELD; DIMERIZATION; DIMERS; PHYSICS; SPIN

Citation Formats

Wu, Hua, Hu, Z., Burnus, T., Denlinger, J. D., Khalifah, Peter, Mandrus, David, Jang, L. Y., Hsieh, 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, Peter, Mandrus, David, Jang, L. Y., Hsieh, 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, Peter, Mandrus, David, Jang, L. Y., Hsieh, H. H., Tanaka, A., Liang, K. S., Allen, J W, Cava, R. J., Khomskii, D. I., and Tjeng, L. H.. Sun . "Orbitally Driven Spin-Singlet Dimerization in S=1 La4Ru2O10". United States. doi:10.1103/PhysRevLett.96.256402.
@article{osti_978209,
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, Peter and Mandrus, David and Jang, L. Y. and Hsieh, 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-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 in a quasi-two-dimensional S=1 system.},
doi = {10.1103/PhysRevLett.96.256402},
journal = {Physical Review Letters},
number = 25,
volume = 96,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}