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Title: Spin dynamics of the block orbital-selective Mott phase

Abstract

Iron-based superconductors display a variety of magnetic phases originating in the competition between electronic, orbital, and spin degrees of freedom. Previous theoretical investigations of the multi-orbital Hubbard model in one-dimension revealed the existence of an orbital-selective Mott phase (OSMP) with block spin order. Recent inelastic neutron scattering (INS) experiments on the BaFe 2Se 3 ladder compound confirmed the relevance of the block-OSMP. Moreover, the powder INS spectrum revealed an unexpected structure, containing both low-energy acoustic and high-energy optical modes. We present the theoretical prediction for the dynamical spin structure factor within a block-OSMP regime using the density-matrix renormalization-group method. In agreement with experiments, we find two dominant features: low-energy dispersive and high-energy dispersionless modes. We argue that the former represents the spin-wave-like dynamics of the block ferromagnetic islands, while the latter is attributed to a novel type of local on-site spin excitations controlled by the Hund coupling.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [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 & Technology Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS) and Computational Sciences and Engineering Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division, Center for Nanophase Materials Science (CNMS) and Computational Sciences and Engineering Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1471827
Grant/Contract Number:  
AC05-00OR22725; DMR-1404375
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Herbrych, Jacek W., Kaushal, Nitin, Nocera, Alberto, Alvarez, Gonzalo, Moreo, Adriana, and Dagotto, Elbio R. Spin dynamics of the block orbital-selective Mott phase. United States: N. p., 2018. Web. doi:10.1038/s41467-018-06181-6.
Herbrych, Jacek W., Kaushal, Nitin, Nocera, Alberto, Alvarez, Gonzalo, Moreo, Adriana, & Dagotto, Elbio R. Spin dynamics of the block orbital-selective Mott phase. United States. doi:10.1038/s41467-018-06181-6.
Herbrych, Jacek W., Kaushal, Nitin, Nocera, Alberto, Alvarez, Gonzalo, Moreo, Adriana, and Dagotto, Elbio R. Thu . "Spin dynamics of the block orbital-selective Mott phase". United States. doi:10.1038/s41467-018-06181-6. https://www.osti.gov/servlets/purl/1471827.
@article{osti_1471827,
title = {Spin dynamics of the block orbital-selective Mott phase},
author = {Herbrych, Jacek W. and Kaushal, Nitin and Nocera, Alberto and Alvarez, Gonzalo and Moreo, Adriana and Dagotto, Elbio R.},
abstractNote = {Iron-based superconductors display a variety of magnetic phases originating in the competition between electronic, orbital, and spin degrees of freedom. Previous theoretical investigations of the multi-orbital Hubbard model in one-dimension revealed the existence of an orbital-selective Mott phase (OSMP) with block spin order. Recent inelastic neutron scattering (INS) experiments on the BaFe2Se3 ladder compound confirmed the relevance of the block-OSMP. Moreover, the powder INS spectrum revealed an unexpected structure, containing both low-energy acoustic and high-energy optical modes. We present the theoretical prediction for the dynamical spin structure factor within a block-OSMP regime using the density-matrix renormalization-group method. In agreement with experiments, we find two dominant features: low-energy dispersive and high-energy dispersionless modes. We argue that the former represents the spin-wave-like dynamics of the block ferromagnetic islands, while the latter is attributed to a novel type of local on-site spin excitations controlled by the Hund coupling.},
doi = {10.1038/s41467-018-06181-6},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {9}
}

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