Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice

P. M. Sarte; R. A. Cowley; E. E. Rodriguez; E. Pachoud; D. Le; V. Garcia-Sakai; J. W. Taylor; C. D. Frost; D. Prabhakaran; C. MacEwen; A. Kitada; A. J. Browne; M. Songvilay; Z. Yamani; W. J. L. Buyers; J. P. Attfield; C. Stock

doi:10.1103/PhysRevB.98.024415

Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice

P. M. Sarte^*, R. A. Cowley, E. E. Rodriguez, E. Pachoud, D. Le, V. Garcia-Sakai, J. W. Taylor, C. D. Frost, D. Prabhakaran, C. MacEwen, A. Kitada, A. J. Browne, M. Songvilay, Z. Yamani, W. J. L. Buyers, J. P. Attfield, C. Stock

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180 degrees exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t(2g) channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t(2g) orbital degeneracy.

Original language	English
Article number	024415
Number of pages	7
Journal	Physical Review B
Volume	98
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.98.024415
Publication status	Published - 17 Jul 2018

Keywords / Materials (for Non-textual outputs)

MAGNETIC EXCITATIONS
COBALT OXIDE
SUPEREXCHANGE INTERACTION
ISOLATED CLUSTERS
MIXED-CRYSTALS
SCATTERING
IONS
COO
ANTIFERROMAGNETISM
SUSCEPTIBILITY

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10.1103/PhysRevB.98.024415

69877389Stock - 1807.05012Accepted author manuscript, 2.53 MB
PhysRevB.98.024415Final published version, 1.23 MB

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Sarte, P. M., Cowley, R. A., Rodriguez, E. E., Pachoud, E., Le, D., Garcia-Sakai, V., Taylor, J. W., Frost, C. D., Prabhakaran, D., MacEwen, C., Kitada, A., Browne, A. J., Songvilay, M., Yamani, Z., Buyers, W. J. L., Attfield, J. P., & Stock, C. (2018). Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice. Physical Review B, 98(2), Article 024415. https://doi.org/10.1103/PhysRevB.98.024415

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title = "Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice",

abstract = "Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180 degrees exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t(2g) channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t(2g) orbital degeneracy.",

keywords = "MAGNETIC EXCITATIONS, COBALT OXIDE, SUPEREXCHANGE INTERACTION, ISOLATED CLUSTERS, MIXED-CRYSTALS, SCATTERING, IONS, COO, ANTIFERROMAGNETISM, SUSCEPTIBILITY",

author = "Sarte, \{P. M.\} and Cowley, \{R. A.\} and Rodriguez, \{E. E.\} and E. Pachoud and D. Le and V. Garcia-Sakai and Taylor, \{J. W.\} and Frost, \{C. D.\} and D. Prabhakaran and C. MacEwen and A. Kitada and Browne, \{A. J.\} and M. Songvilay and Z. Yamani and Buyers, \{W. J. L.\} and Attfield, \{J. P.\} and C. Stock",

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doi = "10.1103/PhysRevB.98.024415",

language = "English",

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Sarte, PM, Cowley, RA, Rodriguez, EE, Pachoud, E, Le, D, Garcia-Sakai, V, Taylor, JW, Frost, CD, Prabhakaran, D, MacEwen, C, Kitada, A, Browne, AJ, Songvilay, M, Yamani, Z, Buyers, WJL, Attfield, JP & Stock, C 2018, 'Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice', Physical Review B, vol. 98, no. 2, 024415. https://doi.org/10.1103/PhysRevB.98.024415

TY - JOUR

T1 - Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice

AU - Sarte, P. M.

AU - Cowley, R. A.

AU - Rodriguez, E. E.

AU - Pachoud, E.

AU - Le, D.

AU - Garcia-Sakai, V.

AU - Taylor, J. W.

AU - Frost, C. D.

AU - Prabhakaran, D.

AU - MacEwen, C.

AU - Kitada, A.

AU - Browne, A. J.

AU - Songvilay, M.

AU - Yamani, Z.

AU - Buyers, W. J. L.

AU - Attfield, J. P.

AU - Stock, C.

PY - 2018/7/17

Y1 - 2018/7/17

N2 - Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180 degrees exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t(2g) channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t(2g) orbital degeneracy.

AB - Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180 degrees exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t(2g) channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t(2g) orbital degeneracy.

KW - MAGNETIC EXCITATIONS

KW - COBALT OXIDE

KW - SUPEREXCHANGE INTERACTION

KW - ISOLATED CLUSTERS

KW - MIXED-CRYSTALS

KW - SCATTERING

KW - IONS

KW - COO

KW - ANTIFERROMAGNETISM

KW - SUSCEPTIBILITY

U2 - 10.1103/PhysRevB.98.024415

DO - 10.1103/PhysRevB.98.024415

M3 - Article

SN - 2469-9950

VL - 98

JO - Physical Review B

JF - Physical Review B

IS - 2

M1 - 024415

ER -

Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice

Abstract

Keywords / Materials (for Non-textual outputs)

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