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

被引：9

作者：

Ramazanoglu, M. ^{[1
]}

Sapkota, A. ^{[2
,3
]}

Pandey, Abhishek ^{[2
,3
,5
]}

Lamsal, J. ^{[2
,3
]}

Abernathy, D. L. ^{[4
]}

Niedziela, J. L. ^{[4
]}

Stone, M. B. ^{[4
]}

Kreyssig, A. ^{[2
,3
]}

Goldman, A. I. ^{[2
,3
]}

Johnston, D. C. ^{[2
,3
]}

McQueeney, R. J. ^{[2
,3
]}

机构：

[1] Istanbul Tech Univ, Phys Engn Dept, TR-34469 Istanbul, Turkey

[2] Ames Lab, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[5] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 22期

关键词：

SUPERCONDUCTOR;

D O I：

10.1103/PhysRevB.95.224401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 Neel 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 Ba1-x K-x Mn2As2 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 J(1)-J(2)-J(c) 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.

引用

页数：12

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