Spin dynamics in granular CoxCu1-x by μSR

被引：2

作者：

Kalvius, GM

Noakes, DR

Wäppling, R ^{[1
]}

Schreier, E

Marcano, N

Rössler, UK

Nenkove, K

Müller, KH

Idzikowski, B

机构：

[1] Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden

[2] Virginia Polytech Inst & State Univ, Dept Phys, Petersburg, VA 23806 USA

[3] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany

[4] Univ Cantabria, Dept CITIMAC, E-39005 Santander, Spain

[5] Inst Festkorper & Werkstofforsch, D-01171 Dresden, Germany

[6] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 326卷 / 1-4期

关键词：

spin glass; magnetic clusters;

D O I：

10.1016/S0921-4526(02)01674-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

CoxCu1-x, samples with x = 0.01,0.02,0.05 produced by melt spinning were probed with zero-field and longitudinal field muSR. For x = 0.05, freezing into a spin glass state below 15 K is seen. Spectra between 15 and similar to 150 K consist of the sum of two relaxation functions: a weakly dynamic Lorentzian Kubo-Toyabe (DLKT) and a root exponential (REX) relaxation. The cause is either a size distribution of precipitates or a strong heterogeneity in the spatial cluster arrangement. Above similar to 150 K, relaxation is purely REX with the slow rate of 1.5 mus(-1), nearly independent of temperature. Persistent correlations between the clusters slow down the fluctuations of cluster moments and the state of free cluster moments is not reached in the temperature range investigated. The muSR response of the samples with lower Co concentration (0.2 and 0.1 at%) is characterized mainly by an increase of spin dynamics and a smaller mean field, implying a reduction of cluster-cluster couplings and a reduction of the moment of the precipitates. For x - 0.1, a spin glass state is not formed down to 2 K. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：489 / 493

页数：5

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