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Title: Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders

Journal Article · · Communications Physics
 [1];  [1];  [2];  [1];  [3];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science & Mathematics Division. Center for Nanophase Materials Sciences
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy. Joint Inst. for Advanced Materials
+ Show Author Affiliations

Resonant Inelastic X-Ray Scattering (RIXS) experiments on the iron-based ladder BaFe2Se3 unveiled an unexpected two-peak structure associated with local orbital (dd) excitations in a block-type antiferromagnetic phase. A mixed character between correlated band-like and localized excitations was also reported. Here, we use the density matrix renormalization group method to calculate the momentum-resolved charge- and orbital-dynamical response functions of a multi-orbital Hubbard chain. Remarkably, our results qualitatively resemble the BaFe2Se3 RIXS data, while also capturing the presence of long-range magnetic order as found in neutron scattering, only when the model is in an exotic orbital-selective Mott phase (OSMP). In the calculations, the experimentally observed zero-momentum transfer RIXS peaks correspond to excitations between itinerant and Mott insulating orbitals. We provide experimentally testable predictions for the momentum-resolved charge and orbital dynamical structures, which can provide further insight into the OSMP regime of BaFe2Se3.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); National Science Foundation (NSF) (United States)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1542206
Journal Information:
Communications Physics, Journal Name: Communications Physics Vol. 2; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Magnetic states of iron-based two-leg ladder tellurides journal November 2019
Robust block magnetism in the spin ladder compound BaFe 2 Se 3 under hydrostatic pressure journal December 2019
Novel Magnetic Block States in Low-Dimensional Iron-Based Superconductors journal July 2019

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