Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2

M. Ramazanoglu; A. Sapkota; Abhishek Pandey; J. Lamsal; D. L. Abernathy; J. L. Niedziela; M. B. Stone; A. Kreyssig; A. I. Goldman; D. C. Johnston; R. J. McQueeney

doi:10.1103/PhysRevB.95.224401

Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2

M. Ramazanoglu, A. Sapkota, Abhishek Pandey, J. Lamsal, D. L. Abernathy, J. L. Niedziela, M. B. Stone, A. Kreyssig, A. I. Goldman, D. C. Johnston, R. J. McQueeney

Department of Physics Engineering

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

8 Citations (Scopus)

Abstract

BaMn2As2 is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition causes only a small suppression of the Néel temperature (TN) and the ordered moment, suggesting that doped holes interact weakly with the Mn spin system. Powder inelastic neutron scattering measurements were performed on three different samples of Ba1-xKxMn2As2 with x=0, 0.125, and 0.25 to study the effect of hole doping and metallization on the spin dynamics. We compare the neutron intensities to a linear spin-wave theory approximation to the J1-J2-Jc Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. The changes observed in the exchange constants are consistent with the small drop of TN with doping.

Original language	English
Article number	224401
Journal	Physical Review B
Volume	95
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.95.224401
Publication status	Published - 1 Jun 2017

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© 2017 American Physical Society.

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title = "Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2",

abstract = "BaMn2As2 is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition causes only a small suppression of the N{\'e}el temperature (TN) and the ordered moment, suggesting that doped holes interact weakly with the Mn spin system. Powder inelastic neutron scattering measurements were performed on three different samples of Ba1-xKxMn2As2 with x=0, 0.125, and 0.25 to study the effect of hole doping and metallization on the spin dynamics. We compare the neutron intensities to a linear spin-wave theory approximation to the J1-J2-Jc Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. The changes observed in the exchange constants are consistent with the small drop of TN with doping.",

author = "M. Ramazanoglu and A. Sapkota and Abhishek Pandey and J. Lamsal and Abernathy, {D. L.} and Niedziela, {J. L.} and Stone, {M. B.} and A. Kreyssig and Goldman, {A. I.} and Johnston, {D. C.} and McQueeney, {R. J.}",

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doi = "10.1103/PhysRevB.95.224401",

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T1 - Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2

AU - Ramazanoglu, M.

AU - Sapkota, A.

AU - Pandey, Abhishek

AU - Lamsal, J.

AU - Abernathy, D. L.

AU - Niedziela, J. L.

AU - Stone, M. B.

AU - Kreyssig, A.

AU - Goldman, A. I.

AU - Johnston, D. C.

AU - McQueeney, R. J.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - BaMn2As2 is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition causes only a small suppression of the Néel temperature (TN) and the ordered moment, suggesting that doped holes interact weakly with the Mn spin system. Powder inelastic neutron scattering measurements were performed on three different samples of Ba1-xKxMn2As2 with x=0, 0.125, and 0.25 to study the effect of hole doping and metallization on the spin dynamics. We compare the neutron intensities to a linear spin-wave theory approximation to the J1-J2-Jc Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. The changes observed in the exchange constants are consistent with the small drop of TN with doping.

AB - BaMn2As2 is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition causes only a small suppression of the Néel temperature (TN) and the ordered moment, suggesting that doped holes interact weakly with the Mn spin system. Powder inelastic neutron scattering measurements were performed on three different samples of Ba1-xKxMn2As2 with x=0, 0.125, and 0.25 to study the effect of hole doping and metallization on the spin dynamics. We compare the neutron intensities to a linear spin-wave theory approximation to the J1-J2-Jc Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. The changes observed in the exchange constants are consistent with the small drop of TN with doping.

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Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2

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