Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session Z22: Focus Session: Fe-based Superconductors - Orbital Order and Chalcogenides
11:15 AM–2:15 PM,
Friday, March 2, 2012
Sponsoring Units: DMP DCOMP
Chair: Tom Devereaux, Stanford University
Abstract ID: BAPS.2012.MAR.Z22.1
Abstract: Z22.00001 : Orbital Order and Orthorhombic Anisotropy in Iron Pnictides*
11:15 AM–11:51 AM
(Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory)
Orthorhombic anisotropy has been reported in iron-pnictide superconductors by a broad range of experiments, including neutron scattering, transport measurements, and a variety of spectroscopies. We explore the idea that these observed anisotropies of broken tetragonal symmetry stem from an ordering of the partially-filled iron d-orbitals. In particular, we will consider a model Hamiltonian that couples the spin and orbital variables, and show that this spin-orbital model captures several observed behaviors in the iron-pnictide materials. We will conclude the talk by discussing x-ray absorption linear dichroism and other recent experiments supportive of theories highlighting the orbital degrees of freedom.
*Research supported by the U.S. Department of Energy under contract No. DE-AC02-76SF00515. Work in collaboration with the research groups of Thomas Devereaux and Rajiv Singh.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Z22.1
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