Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet
Abstract
Magnetization and high-resolution x-ray diffraction measurements of the Kitaev-Heisenberg material α-RuCl3 reveal a pressure-induced crystallographic and magnetic phase transition at a hydrostatic pressure of p ~ 0.2 GPa. This structural transition into a triclinic phase is characterized by a very strong dimerization of the Ru-Ru bonds, accompanied by a collapse of the magnetic susceptibility. Ab initio quantum-chemistry calculations disclose a pressure-induced enhancement of the direct 4d-4d bonding on particular Ru-Ru links, causing a sharp increase of the antiferromagnetic exchange interactions. These combined experimental and computational data show that the Kitaev spin-liquid phase in α-RuCl3 strongly competes with the crystallization of spin singlets into a valence bond solid.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); European Commission (EC); Gordon and Betty Moore Foundation
- OSTI Identifier:
- 1454369
- Alternate Identifier(s):
- OSTI ID: 1761764
- Grant/Contract Number:
- AC05-00OR22725; SFB 1143; WO 1532/3-2; 796048; GBMF4416
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Name: Physical Review. B Journal Volume: 97 Journal Issue: 24; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Bastien, G., Garbarino, G., Yadav, R., Martinez-Casado, F. J., Beltrán Rodríguez, R., Stahl, Q., Kusch, M., Limandri, S. P., Ray, R., Lampen-Kelley, P., Mandrus, D. G., Nagler, S. E., Roslova, M., Isaeva, A., Doert, T., Hozoi, L., Wolter, A. U. B., Büchner, B., Geck, J., and van den Brink, J. Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet α − RuCl 3. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.97.241108.
Bastien, G., Garbarino, G., Yadav, R., Martinez-Casado, F. J., Beltrán Rodríguez, R., Stahl, Q., Kusch, M., Limandri, S. P., Ray, R., Lampen-Kelley, P., Mandrus, D. G., Nagler, S. E., Roslova, M., Isaeva, A., Doert, T., Hozoi, L., Wolter, A. U. B., Büchner, B., Geck, J., & van den Brink, J. Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet α − RuCl 3. United States. https://doi.org/10.1103/PhysRevB.97.241108
Bastien, G., Garbarino, G., Yadav, R., Martinez-Casado, F. J., Beltrán Rodríguez, R., Stahl, Q., Kusch, M., Limandri, S. P., Ray, R., Lampen-Kelley, P., Mandrus, D. G., Nagler, S. E., Roslova, M., Isaeva, A., Doert, T., Hozoi, L., Wolter, A. U. B., Büchner, B., Geck, J., and van den Brink, J. Fri .
"Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet α − RuCl 3". United States. https://doi.org/10.1103/PhysRevB.97.241108.
@article{osti_1454369,
title = {Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet α − RuCl 3},
author = {Bastien, G. and Garbarino, G. and Yadav, R. and Martinez-Casado, F. J. and Beltrán Rodríguez, R. and Stahl, Q. and Kusch, M. and Limandri, S. P. and Ray, R. and Lampen-Kelley, P. and Mandrus, D. G. and Nagler, S. E. and Roslova, M. and Isaeva, A. and Doert, T. and Hozoi, L. and Wolter, A. U. B. and Büchner, B. and Geck, J. and van den Brink, J.},
abstractNote = {Magnetization and high-resolution x-ray diffraction measurements of the Kitaev-Heisenberg material α-RuCl3 reveal a pressure-induced crystallographic and magnetic phase transition at a hydrostatic pressure of p ~ 0.2 GPa. This structural transition into a triclinic phase is characterized by a very strong dimerization of the Ru-Ru bonds, accompanied by a collapse of the magnetic susceptibility. Ab initio quantum-chemistry calculations disclose a pressure-induced enhancement of the direct 4d-4d bonding on particular Ru-Ru links, causing a sharp increase of the antiferromagnetic exchange interactions. These combined experimental and computational data show that the Kitaev spin-liquid phase in α-RuCl3 strongly competes with the crystallization of spin singlets into a valence bond solid.},
doi = {10.1103/PhysRevB.97.241108},
journal = {Physical Review. B},
number = 24,
volume = 97,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2018},
month = {Fri Jun 15 00:00:00 EDT 2018}
}
https://doi.org/10.1103/PhysRevB.97.241108
Web of Science
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