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Title: Spin-gap and two-dimensional magnetic excitations in Sr 2 IrO 4

Abstract

Time-of-flight inelastic neutron scattering measurements on Sr 2IrO 4 single crystals were performed to access the spin Hamiltonian in this canonical J eff = 1/2 spin-orbital Mott insulator. The momentum of magnetic scattering at all inelastic energies measured is revealed to be L independent, indicative of idealized two-dimensional in-plane correlations. Furthermore, we model the in-plane energy and momentum dependence of the excitations, that were measured up to ~80 meV, and define a spin gap of 0.6(1) meV. Collectively, the results indicate that despite the strongly spin-orbit entangled isospins, an isotropic two-dimensional S = 1/2 Heisenberg model Hamiltonian accurately describes the magnetic interactions, confirming a robust analogy with unconventional superconducting cuprates.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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)
OSTI Identifier:
1486944
Alternate Identifier(s):
OSTI ID: 1484419
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Calder, Stuart A., Pajerowski, Daniel M., Stone, Matthew B., and May, Andrew F. Spin-gap and two-dimensional magnetic excitations in Sr2IrO4. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.220402.
Calder, Stuart A., Pajerowski, Daniel M., Stone, Matthew B., & May, Andrew F. Spin-gap and two-dimensional magnetic excitations in Sr2IrO4. United States. doi:10.1103/PhysRevB.98.220402.
Calder, Stuart A., Pajerowski, Daniel M., Stone, Matthew B., and May, Andrew F. Tue . "Spin-gap and two-dimensional magnetic excitations in Sr2IrO4". United States. doi:10.1103/PhysRevB.98.220402. https://www.osti.gov/servlets/purl/1486944.
@article{osti_1486944,
title = {Spin-gap and two-dimensional magnetic excitations in Sr2IrO4},
author = {Calder, Stuart A. and Pajerowski, Daniel M. and Stone, Matthew B. and May, Andrew F.},
abstractNote = {Time-of-flight inelastic neutron scattering measurements on Sr2IrO4 single crystals were performed to access the spin Hamiltonian in this canonical Jeff = 1/2 spin-orbital Mott insulator. The momentum of magnetic scattering at all inelastic energies measured is revealed to be L independent, indicative of idealized two-dimensional in-plane correlations. Furthermore, we model the in-plane energy and momentum dependence of the excitations, that were measured up to ~80 meV, and define a spin gap of 0.6(1) meV. Collectively, the results indicate that despite the strongly spin-orbit entangled isospins, an isotropic two-dimensional S = 1/2 Heisenberg model Hamiltonian accurately describes the magnetic interactions, confirming a robust analogy with unconventional superconducting cuprates.},
doi = {10.1103/PhysRevB.98.220402},
journal = {Physical Review B},
number = 22,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

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