Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>3.1</mml:mn></mml:mrow></mml:msub></mml:math>In

Svanidze, Eteri; Morosan, Emilia

doi:10.1103/physrevb.88.064412

Cited by 8 publications

(6 citation statements)

References 40 publications

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“…There is a good fit with the data with τ 0 ∼ 10 −38 s, T g = 200.9(1) K, and zν = 18 (1). While the good fitting of equation ( 1) to the data suggests the possibility of a spin-glass-like phase transition, the value of the fitting parameter τ 0 is unphysical and zν is outside the range for a canonical spin glass (4-10) [44,45], but is close to the values reported for cluster glass and superspin glass (10-15) [29,30,[46][47][48]. The anomaly in τ 0 could be due to error in the estimation of the fitting parameter caused by the limited span of the frequency range.…”

Section: Dynamic Scaling and Ac Susceptibilitysupporting

confidence: 69%

Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃

Kumar

2014

J. Phys.: Condens. Matter

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We report the magnetization study of the compound La0.75Ba0.25CoO3 where Ba 2+ doping is just above the critical limit for percolation of ferromagnetic clusters. The field cooled (FC) and zero field cooled (ZFC) magnetization exhibit a thermomagnetic irreversibility and the ac susceptibility show a frequency dependent peak at the ferromagnetic ordering temperature (TC ≈203 K) of the clusters. These features indicate about the presence of a non-equilibrium state below TC . In the nonequilibrium state, the dynamic scaling of the imaginary part of ac susceptibility and the static scaling of the nonlinear susceptibility clearly establish a spin-glass like cooperative freezing of ferromagnetic clusters at 200.9(2) K. The existence of spin-glass like freezing of ferromagnetic clusters is further substantiated by the ZFC aging and memory experiments. We also observe certain dynamical features which are not present in a typical spin-glass, such as, initial magnetization after ZFC aging first increases and then decreases with the wait time and an imperfect recovery of relaxation in negative temperature cycling experiments. This imperfect recovery transforms to perfect recovery on concurrent field cycling. Our analysis suggests that these additional dynamical features have their origin in inter-cluster exchange interaction and cluster size distribution. The inter-cluster exchange interaction above the magnetic percolation gives a superferromagnetic state in some granular thin films but our results show the absence of typical superferromagnetic like state in La0.75Ba0.25CoO3.

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Section: Dynamic Scaling and Ac Susceptibilitysupporting

confidence: 69%

Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃

Kumar

2014

J. Phys.: Condens. Matter

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“…of the peak in susceptibility, f 0 = 1/τ 0 a characteristic relaxation frequency with characteristic relaxation time τ 0 , z is the dynamic exponent, and ν is the critical exponent. The exponent zν is used as a general indicator for glassiness with typical values for systems with glassy behavior ranging from 2 ≤ z ν ≤ 14 49 . In 1T-Fe x TiS 2 spin glass behavior is observed for x = 0.1 − 0.7, with zν ranging from 7.61 to 17.21, as seen in Table III.…”

Section: Discussionmentioning

confidence: 99%

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

et al. 2019

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Sharp magnetization switching and large magnetoresistance (MR) were previously discovered in single crystals of 2H-FexTaS2 and attributed to the Fe superstructure and its defects. We report similar sharp switching and large MR in 1T-FexTiS2 (0.086 ≤ x ≤0.703), while providing a side by side comparison of the only two such ferromagnetic transition metal dichalcogenides. The switching field Hs and MR values are similar in both 1T-FexTiS2 and 2H-FexTaS2, with a larger than expected bowtie ρ(H) and a sharper hysteresis loop for H c in the former. The Curie and Weiss temperatures remain roughly constant below x ∼ 1/3 in the T = Ti single crystals, before monotonically increasing for higher x, while Hs and MR reach maxima where defects in the superstructure exist, or a minimum near superstructures compositions, and remain constant above x ∼ 0.4. Despite previous reports, electron diffraction shows only the √ 3× √ 3 superstructure in 1T-FexTiS2. Glassy behavior is shown to coexist within the ferromagnetic state in 1T-FexTiS2 for compositions between 0.1 and 0.703. A simple theoretical model considering first-, second-and third-neighbor interactions yields a phase diagram which accounts for both spin glass behavior and for different superstructures.

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“…of the peak in susceptibility, f 0 = 1/τ 0 a characteristic relaxation frequency with characteristic relaxation time τ 0 , z is the dynamic exponent, and ν is the critical exponent. The exponent zν is used as a general indicator for glassiness with typical values for systems with glassy behavior ranging from 2 ≤ z ν ≤ 14 [47]. In 1T-Fe x TiS 2 spin glass behavior is observed for x = 0.1 − 0.7, with zν ranging from 7.61 to 17.21, as seen in Table III.…”

Section: Discussionmentioning

confidence: 99%

Magnetotransport in Fe-intercalated \textit{T}S$_2$: the comparison between \textit{T} = Ti and Ta

Choe,

Lee,

Huang

et al. 2018

Preprint

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Sharp magnetization switching and large magnetoresistance were previously discovered in single crystals of 2H-FexTaS2 and attributed to the Fe superstructure and its defects. We report similar sharp switching in 1T-FexTiS2 (0.086 ≤ x ≤0.703) and the discovery of large magnetoresistance. The switching field Hs and magnetoresistance are similar to 2H-FexTaS2, with a larger than expected bowtie magnetoresistance and a sharp hysteresis loop. Despite previous reports, electron diffraction shows only the √ 3× √ 3 superstructure in 1T-FexTiS2. The Curie and Weiss temperatures remain roughly constant below x ∼ 1/3 before monotonically increasing for higher x. By contrast, the switching field and magnetoresistance reach a maximum where defects in the superstructure exist, approach a minimum near perfect superstructures, and remain constant above x ∼ 0.4. Additionally, an increase in Hs with annealing time is reported. Glassy behavior is shown to coexist within the ferromagnetic state in 1T-FexTiS2 for compositions between 0.1 and 0.703. A simple model captures the essential phenomenology and explains most similarities and differences between 1T-FexTiS2 and 2H-FexTaS2, and provides insights into other magnetically intercalated transition metal dichalcogenides.

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Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Cited by 8 publications

References 40 publications

Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃

Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Magnetotransport in Fe-intercalated \textit{T}S$_2$: the comparison between \textit{T} = Ti and Ta

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Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Cited by 8 publications

References 40 publications

Spin-glass-like dynamics of ferromagnetic clusters in La0.75Ba0.25CoO3

Spin-glass-like dynamics of ferromagnetic clusters in La0.75Ba0.25CoO3

Magnetotransport in Fe-intercalated TS2 : Comparison between T=Ti and Ta

Magnetotransport in Fe-intercalated \textit{T}S$_2$: the comparison between \textit{T} = Ti and Ta

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Product

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Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃

Spin-glass-like dynamics of ferromagnetic clusters in La_0.75Ba_0.25CoO₃