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Title: Spin-orbit coupling, strong correlation, and insulator-metal transitions: The J eff = 3 2 ferromagnetic Dirac-Mott insulator Ba 2 NaOsO 6

Abstract

The double perovskite Ba 2NaOsO 6 (BNOO), an exotic example of a very high oxidation state (heptavalent) osmium d1 compound and also uncommon by being a ferromagnetic open d-shell (Mott) insulator without Jahn-Teller (JT) distortion, is modeled using a density functional theory based hybrid functional incorporating exact exchange for correlated electronic orbitals and including the large spin-orbit coupling (SOC). The experimentally observed narrow-gap ferromagnetic insulating ground state is obtained, but only when including spin-orbit coupling, making this a Dirac-Mott insulator. The calculated easy axis along [110] is in accord with experiment, providing additional support that this approach provides a realistic method for studying this system. The predicted spin density for [110] spin orientation is nearly cubic (unlike for other directions), providing an explanation for the absence of JT distortion. An orbital moment of –0.4μ B strongly compensates the +0.5μ B spin moment on Os, leaving a strongly compensated moment more in line with experiment. Remarkably, the net moment lies primarily on the oxygen ions. An insulator-metal transition, by rotating the magnetization direction with an external field under moderate pressure, is predicted as one consequence of strong SOC, and metallization under moderate pressure is predicted. In conclusion, a comparison is mademore » with the isostructural, isovalent insulator Ba 2LiOsO 6, which, however, orders antiferromagnetically.« less

Authors:
 [1];  [1]
  1. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1343387
Alternate Identifier(s):
OSTI ID: 1180258
Grant/Contract Number:
NA0001842; AC02-05CH11231; FG03-03NA00071; FG02-04ER46111
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; spin-orbit coupling; strong correlation; insulating ferromagnet; magnetic moment

Citation Formats

Gangopadhyay, Shruba, and Pickett, Warren E. Spin-orbit coupling, strong correlation, and insulator-metal transitions: The Jeff=32 ferromagnetic Dirac-Mott insulator Ba2NaOsO6. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.045133.
Gangopadhyay, Shruba, & Pickett, Warren E. Spin-orbit coupling, strong correlation, and insulator-metal transitions: The Jeff=32 ferromagnetic Dirac-Mott insulator Ba2NaOsO6. United States. doi:10.1103/PhysRevB.91.045133.
Gangopadhyay, Shruba, and Pickett, Warren E. Thu . "Spin-orbit coupling, strong correlation, and insulator-metal transitions: The Jeff=32 ferromagnetic Dirac-Mott insulator Ba2NaOsO6". United States. doi:10.1103/PhysRevB.91.045133. https://www.osti.gov/servlets/purl/1343387.
@article{osti_1343387,
title = {Spin-orbit coupling, strong correlation, and insulator-metal transitions: The Jeff=32 ferromagnetic Dirac-Mott insulator Ba2NaOsO6},
author = {Gangopadhyay, Shruba and Pickett, Warren E.},
abstractNote = {The double perovskite Ba2NaOsO6 (BNOO), an exotic example of a very high oxidation state (heptavalent) osmium d1 compound and also uncommon by being a ferromagnetic open d-shell (Mott) insulator without Jahn-Teller (JT) distortion, is modeled using a density functional theory based hybrid functional incorporating exact exchange for correlated electronic orbitals and including the large spin-orbit coupling (SOC). The experimentally observed narrow-gap ferromagnetic insulating ground state is obtained, but only when including spin-orbit coupling, making this a Dirac-Mott insulator. The calculated easy axis along [110] is in accord with experiment, providing additional support that this approach provides a realistic method for studying this system. The predicted spin density for [110] spin orientation is nearly cubic (unlike for other directions), providing an explanation for the absence of JT distortion. An orbital moment of –0.4μB strongly compensates the +0.5μB spin moment on Os, leaving a strongly compensated moment more in line with experiment. Remarkably, the net moment lies primarily on the oxygen ions. An insulator-metal transition, by rotating the magnetization direction with an external field under moderate pressure, is predicted as one consequence of strong SOC, and metallization under moderate pressure is predicted. In conclusion, a comparison is made with the isostructural, isovalent insulator Ba2LiOsO6, which, however, orders antiferromagnetically.},
doi = {10.1103/PhysRevB.91.045133},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 4,
volume = 91,
place = {United States},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}

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Cited by: 14works
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