Kondo effect and spin-glass behavior of dilute iron clusters in silver films

Herrera, W. T.; Xing, Yutao; Ramos, S. M.; Munayco, P.; Fontes, M. B.; Baggio-Saitovitch, E.; Litterst, F. J.

doi:10.1103/physrevb.84.014430

Cited by 15 publications

(10 citation statements)

References 25 publications

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“…0.05%. Preparation was performed under high-vacuum conditions as described in [2,3]. The Kapton substrate was kept at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The paramagnetic pattern reveals two quadrupole doublets assigned to the mentioned two types of clusters and a minor single line contribution from monomeric iron. For details of the fit procedure, see [2]. Fluctuation of cluster moments is fast compared to nuclear Larmor precession in locally acting fields so that no magnetic hyperfine splitting is observed.…”

Section: Methodsmentioning

confidence: 99%

“…Their magnetic and electronic behaviour is complex due to counteracting magnetic coupling and Kondo effect [2]. Silver films (typical thickness 1 μm) containing iron, have been prepared by vapor codeposition from atomic beams [2,3]. Depending on substrate temperature and iron concentration, nanometer sized clusters of iron are formed.…”

Section: Introductionmentioning

confidence: 99%

“…Since iron is practically immiscible in silver, higher concentrations will lead to formation of clusters. Their magnetic and electronic behaviour is complex due to counteracting magnetic coupling and Kondo effect [2]. Silver films (typical thickness 1 μm) containing iron, have been prepared by vapor codeposition from atomic beams [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on substrate temperature and iron concentration, nanometer sized clusters of iron are formed. Samples were characterized via X RD, EX AF S, resistivity, magnetization, susceptibility and Mössbauer spectroscopic measurements [2,3]. Up to about 2 at% Fe concentration films contain dominantly two types of clusters with only up to about 20 iron atoms/cluster.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic dynamics of dilute iron nano-clusters in silver films from Mössbauer spectroscopy and muon spin rotation

et al. 2011

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A silver film containing nanometer size clusters of iron (nominal conc. 1 at%) has been studied by Mössbauer spectroscopy and Low-Energy Muon Spin Rotation. Below about 20 K spin glass freezing due to interparticle interactions is found from both methods. Whereas Mössbauer spectra are insensitive to the fast fluctuations of cluster moments above spin glass freezing temperature, muon spin rotation in magnetic fields applied perpendicular to the polarized muon spins allows tracing the fluctuations of superparamagnetic moments. The temperature dependence of the damping of the muon spin rotation signal shows Arrhenius behavior between 10 to 100 K. Depending on the assumed shape of damping the activation energy of superparamagnetic fluctuations of cluster moments ranges between about 20 K ·k B and 40 K ·k B . Above about 120 K muon spin depolarization indicates diffusion and trapping of muons.

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“…0.05%. Preparation was performed under high-vacuum conditions as described in [2,3]. The Kapton substrate was kept at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%