Symmetry of reentrant tetragonal phase in : Magnetic versus orbital ordering mechanism
Abstract
Magnetostructural phase transitions in Ba 1-xA xFe 2As 2 (A = K, Na) materials are discussed for both magnetically and orbitally driven mechanisms, using a symmetry analysis formulated within the Landau theory of phase transitions. Both mechanisms predict identical orthorhombic space-group symmetries for the nematic and magnetic phases observed over much of the phase diagram, but they predict different tetragonal space-group symmetries for the newly discovered reentrant tetragonal phase in Ba 1-xNa xFe 2As 2 (x similar to 0.24-0.28). In a magnetic scenario, magnetic order with moments along the c axis, as found experimentally, does not allow any type of orbital order, but in an orbital scenario, we have determined two possible orbital patterns, specified by P4/mnc1' and I4221' space groups, which do not require atomic displacements relative to the parent I4/mmm1' symmetry and, in consequence, are indistinguishable in conventional diffraction experiments. We demonstrate that the three possible space groups are, however, distinct in resonant x-ray Bragg diffraction patterns created by Templeton & Templeton scattering. This provides an experimental method of distinguishing between magnetic and orbital models.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1392314
- DOE Contract Number:
- AC02-06CH11357
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 17; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Khalyavin, D. D., Lovesey, S. W., Manuel, P., Krüger, F., Rosenkranz, S., Allred, J. M., Chmaissem, O., and Osborn, R. Symmetry of reentrant tetragonal phase in Ba1-xNaxFe2As2 : Magnetic versus orbital ordering mechanism. United States: N. p., 2014.
Web. doi:10.1103/PhysRevB.90.174511.
Khalyavin, D. D., Lovesey, S. W., Manuel, P., Krüger, F., Rosenkranz, S., Allred, J. M., Chmaissem, O., & Osborn, R. Symmetry of reentrant tetragonal phase in Ba1-xNaxFe2As2 : Magnetic versus orbital ordering mechanism. United States. https://doi.org/10.1103/PhysRevB.90.174511
Khalyavin, D. D., Lovesey, S. W., Manuel, P., Krüger, F., Rosenkranz, S., Allred, J. M., Chmaissem, O., and Osborn, R. Mon .
"Symmetry of reentrant tetragonal phase in Ba1-xNaxFe2As2 : Magnetic versus orbital ordering mechanism". United States. https://doi.org/10.1103/PhysRevB.90.174511.
@article{osti_1392314,
title = {Symmetry of reentrant tetragonal phase in Ba1-xNaxFe2As2 : Magnetic versus orbital ordering mechanism},
author = {Khalyavin, D. D. and Lovesey, S. W. and Manuel, P. and Krüger, F. and Rosenkranz, S. and Allred, J. M. and Chmaissem, O. and Osborn, R.},
abstractNote = {Magnetostructural phase transitions in Ba1-xAxFe2As2 (A = K, Na) materials are discussed for both magnetically and orbitally driven mechanisms, using a symmetry analysis formulated within the Landau theory of phase transitions. Both mechanisms predict identical orthorhombic space-group symmetries for the nematic and magnetic phases observed over much of the phase diagram, but they predict different tetragonal space-group symmetries for the newly discovered reentrant tetragonal phase in Ba1-xNaxFe2As2 (x similar to 0.24-0.28). In a magnetic scenario, magnetic order with moments along the c axis, as found experimentally, does not allow any type of orbital order, but in an orbital scenario, we have determined two possible orbital patterns, specified by P4/mnc1' and I4221' space groups, which do not require atomic displacements relative to the parent I4/mmm1' symmetry and, in consequence, are indistinguishable in conventional diffraction experiments. We demonstrate that the three possible space groups are, however, distinct in resonant x-ray Bragg diffraction patterns created by Templeton & Templeton scattering. This provides an experimental method of distinguishing between magnetic and orbital models.},
doi = {10.1103/PhysRevB.90.174511},
url = {https://www.osti.gov/biblio/1392314},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 17,
volume = 90,
place = {United States},
year = {2014},
month = {11}
}
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