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

Ramazanoglu, M.; Sapkota, A.; Pandey, Abhishek; Lamsal, J.; Abernathy, Douglas L.; Niedziela, Jennifer L.; Stone, Matthew B.; Kreyssig, A.; Goldman, A. I.; Johnston, D. C.; McQueeney, Robert John

doi:10.1103/PhysRevB.95.224401

Title: Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped ${BaMn}_{2} {As}_{2}$

Journal Article · Thu Jun 01 04:00:00 UTC 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.95.224401 · OSTI ID:1368057

Ramazanoglu, M. ^[1]; Sapkota, A. ^[2]; Pandey, Abhishek ^[2]; Lamsal, J. ^[2];

^[3];

^[3]; Kreyssig, A. ^[2]; Goldman, A. I. ^[2]; Johnston, D. C. ^[2]; McQueeney, Robert John ^[2]

Istanbul Technical Univ., Maslak, Istanbul (Turkey). Dept. of Physics Engineering; Scientific and Technological Research Council of Turkey (Tubitak), Ankara (Turkey)
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

BaMn₂ As₂ 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 (T_N) 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 Ba_{1 - x}K_xMn₂ As₂ 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 $$-$$ J_c Heisenberg model. Hole doping is found to introduce only minor modifications to the exchange energies and spin gap. Lastly, the changes observed in the exchange constants are consistent with the small drop of T_N with doping.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1368057

Report Number(s):: IS-J--9353

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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