Spin excitations in a model of FeSe with orbital ordering

Kreisel, A.; Mukherjee, Shantanu; Hirschfeld, P. J.; Andersen, Brian M.

doi:10.1103/physrevb.92.224515

Spin excitations in a model of FeSe with orbital ordering

Journal Article · Mon Dec 28 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.92.224515· OSTI ID:2496665

Kreisel, A. ^[1]; Mukherjee, Shantanu ^[1]; Hirschfeld, P. J. ^[2]; Andersen, Brian M. ^[1]

University of Copenhagen (Denmark)
University of Florida, Gainesville, FL (United States)

We present a theoretical study of the dynamical spin susceptibility for the intriguing Fe-based superconductor FeSe, based on a tight-binding model developed to account for the temperature-dependent band structure in this system. The model allows for orbital ordering in the d_xz/d_yz channel below the structural transition and presents a strongly C₄-symmetry-broken Fermi surface at low temperatures which accounts for the nematic properties of this material. The calculated spin excitations are peaked at wave vector (π,0) in the 1-Fe Brillouin zone, with a broad maximum at energies of order a few meV. In this range, the occurrence of superconductivity sharpens this peak in energy, creating a (π,0) “neutron resonance” as seen in recent experiments. With the exception of the quite low energy scale of these fluctuations, these results are roughly similar to standard behavior in Fe pnictide systems. At higher energies, however, intensity increases and shifts to wave vectors along the (π,0)–(π,π) line. Here, we compare with existing inelastic neutron experiments and NMR data, and give predictions for further studies.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: Lundbeckfond fellowship; USDOE

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2496665

Alternate ID(s):: OSTI ID: 1234016

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 92; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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