Lattice Size Induced Moment Formation on Isolated Fe Atoms in Nanocrystalline Nb

被引：14

作者：

Mishra, S. N. ^{[1
]}

Mohanta, S. K. ^{[1
]}

Davane, S. M. ^{[1
]}

Kulkarni, N. ^{[1
]}

Ayyub, Pushan ^{[1
]}

机构：

[1] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 14期

关键词：

TRANSITION-METAL HOSTS; NIOBIUM THIN-FILMS; LOCAL MAGNETISM; IMPURITIES; ALLOYS;

D O I：

10.1103/PhysRevLett.105.147203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Measurements of the local susceptibility and 3d spin relaxation rate for single Fe impurities embedded in a nanocrystalline Nb host indicates the emergence of a local moment on Fe at and below a critical size of 11 nm. Our ab initio electronic structure calculations show that the moment formation occurs due to Stoner enhancement arising from a size dependent lattice expansion and a consequent shift in the Fermi level. We also show that a size-induced positive host spin polarization of the Nb-4d band electrons strongly influences the fluctuation rate of the Fe moment.

引用

页数：4

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