Symmetry of reentrant tetragonal phase in Ba1-xNaxFe2As2 : Magnetic versus orbital ordering mechanism

Khalyavin, D. D.; Lovesey, S. W.; Manuel, P.; Krüger, F.; Rosenkranz, S.; Allred, J. M.; Chmaissem, O.; Osborn, R.

doi:10.1103/PhysRevB.90.174511

Title: Symmetry of reentrant tetragonal phase in ${Ba}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$ : Magnetic versus orbital ordering mechanism

Journal Article · Mon Nov 24 00:00:00 EST 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.174511· OSTI ID:1392314

Khalyavin, D. D.; Lovesey, S. W.; Manuel, P.; Krüger, F.; Rosenkranz, S.; Allred, J. M.; Chmaissem, O.; Osborn, R.

Magnetostructural phase transitions in Ba_1-xA_xFe₂As₂ (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_xFe₂As₂ (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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392314

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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