Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn1+δSb

作     者：A. E. Taylor T. Berlijn S. E. Hahn A. F. May T. J. Williams L. Poudel S. Calder R. S. Fishman M. B. Stone A. A. Aczel H. B. Cao M. D. Lumsden A. D. Christianson 

作者机构：Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Center for Nanophase Materials Sciences and Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831-6494 USA Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA 

出 版 物：《Physical Review B》 (物理学评论B辑：凝聚态物质与材料物理学)

年 卷 期：2015年第91卷第22期

页      面：224418-224418页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Oak Ridge National Laboratory Office of Science U.S. Department of Energy 

主　　题：FERROMAGNETIC resonance MAGNETISM SINGLE crystals NEUTRON measurement MAGNETIC moments 

摘      要：We report elastic and inelastic neutron-scattering measurements of the high-TC ferromagnet Mn1+δSb. Measurements were performed on a large, TC=434 K, single crystal with an interstitial Mn content of δ≈0.13. The neutron-diffraction results reveal that the interstitial Mn has a magnetic moment, and that it is aligned antiparallel to the main Mn moment. We perform density functional theory calculations including the interstitial Mn and find the interstitial to be magnetic, in agreement with the diffraction data. The inelastic neutron-scattering measurements reveal two features in the magnetic dynamics: (i) a spin-wave-like dispersion emanating from ferromagnetic Bragg positions (HK2n), and (ii) a broad, nondispersive signal centered at forbidden Bragg positions (HK2n+1). The inelastic spectrum cannot be modeled by simple linear spin-wave-theory calculations and appears to be significantly altered by the presence of the interstitial Mn ions. The results show that the influence of the interstitial Mn on the magnetic state in this system is more important than previously understood.