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arXiv 1206.3486cond-mat.supr-con
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Mn掺杂BaFe2As2中条纹和棋盘格磁不稳定性的竞争

Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2

G. S. Tucker, D. K. Pratt, M. G. Kim, S. Ran, A. Thaler, G. E. Granroth, K. Marty, W. Tian, J. L. Zarestky, M. D. Lumsden, S. L. Bud'ko, P. C. Canfield, A. Krey… 展开作者

G. S. Tucker, D. K. Pratt, M. G. Kim, S. Ran, A. Thaler, G. E. Granroth, K. Marty, W. Tian, J. L. Zarestky, M. D. Lumsden, S. L. Bud'ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, R. J. McQueeney

摘要:

Ba(Fe0.925Mn0.075)2As 2的非弹性中子散射测量表明,在Fe正方晶格中,(1/2,0)和(1/2,1/2)两个波矢上的自旋涨落分别对应于预期的条纹自旋密度波序和棋盘形反铁磁序.在T_N=80 K以下,出现长程条纹磁有序,在(1/2,0)处出现尖锐的自旋波激发,而在(1/2,1/2)处仍存在宽的扩散自旋涨落。低浓度的Mn掺杂剂使(1/2,1/2)处的局部磁矩自旋波动成核,其与(1/2,0)处的巡回自旋波动竞争,并且可能破坏超导性的发展。

英文摘要:

Inelastic neutron scattering measurements on Ba(Fe0.925Mn0.075)2As2 manifest spin fluctuations at two different wavevectors in the Fe square lattice, (1/2,0) and (1/2,1/2), corresponding to the expected stripe spin-density wave order and checkerboard antiferromagnetic order, respectively. Below T_N=80 K, long-range stripe magnetic ordering occurs and sharp spin wave excitations appear at (1/2,0) while broad and diffusive spin fluctuations remain at (1/2,1/2) at all temperatures. Low concentrations of Mn dopants nucleate local moment spin fluctuations at (1/2,1/2) that compete with itinerant spin fluctuations at (1/2,0) and may disrupt the development of superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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