Static and dynamic response of cluster glass in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:m

Mukherjee, Sudip; Ranganathan, R.; Anilkumar, P S; Joy, P. A.

doi:10.1103/physrevb.54.9267

Cited by 338 publications

(152 citation statements)

References 15 publications

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“…͑1͒ yields T g Ϸ 224.6 K, zv Ϸ 2.85, and 0 Ϸ 9.18ϫ 10 −8 s. A similar procedure using the Љ͑T͒ data was also employed for the case of the peak at ϳ170 K, yielding T g Ϸ 137.5 K, zv Ϸ 3.12, and 0 Ϸ 9.8ϫ 10 −6 s. In both these cases, the obtained values of 0 are much larger than typical values for a conventional spin glass system ͑ 0 ϳ 10 −13 s͒, 11 but in good agreement to values found in cluster glass ͑CG͒ systems ͑ 0 ϳ 10 −7 -10 −9 s͒. 12,13 This quantitative analysis indicates that the magnetic phase of the LuFe 2 O 4 system can be viewed as arising due to an assembly of clusters whose sizes and distribution vary with temperature. The difference in 0 for the two cases at ϳ225 K ͑ 0 Ϸ 9.18ϫ 10 −8 s͒ and ϳ170 K ͑ 0 Ϸ 9.8ϫ 10 −6 s͒ clearly suggests a considerable difference in the size and distribution of clusters at these temperatures with the tendency of the average cluster size to increase as the temperature is lowered resulting in much larger relaxation times.…”

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confidence: 66%

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Magnetism and cluster glass dynamics in geometrically frustrated LuFe2O4

Phan

Frey

Srikanth

et al. 2009

Journal of Applied Physics

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We report on the magnetic properties of high quality LuFe2O4 single crystals grown by the floating zone method. dc and ac susceptibility measurements and analysis reveal a ferrimagnetic transition at ∼240 K followed by a re-entrant cluster glass transition below 225 K, with an additional magnetic transition around 170 K. Strong frequency dependence of the real (χ′) and imaginary (χ″) parts of the ac susceptibility observed at both these temperatures indicate glassy behavior and we quantitatively fit the data to a cluster glass model, τ=τo(Tf/Tg−1)−zv. Our studies show that these multiple transitions are consistent with the picture of ferrimagnetic clusters in the iron oxide planes with triangular lattice configuration favoring spin frustration and glass dynamics.

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supporting

confidence: 66%

“…[10][11][12][13] The temperature dependences of the real ͓ Ј͑T͔͒ and imaginary ͓ Љ͑T͔͒ components of the susceptibility of LuFe 2 O 4 were measured at different fixed frequencies ranging from 10 Hz to 10 kHz. In these measurements, the amplitude of the ac field was kept constant at h ac = 10 Oe.…”

mentioning

confidence: 99%

Magnetism and cluster glass dynamics in geometrically frustrated LuFe2O4

Phan

Frey

Srikanth

et al. 2009

Journal of Applied Physics

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“…A cluster-glass structure has already been observed in several manganites [18,5,17] and related compounds [19,20]. Such a structure corresponds to microscopic magnetic moments which align ferromagnetically within finite-size clusters, with a random orientation of the cluster moments with respect to each other.…”

mentioning

confidence: 94%

Disorder effects at low temperatures in La0.7−xYxCa0.3MnO3 manganites

Gusmao¹,

Ghivelder²,

Freitas³

et al. 2003

Solid State Communications

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With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific-heat measurements were performed in zero field, and in magnetic fields up to 9 T in polycrystalline samples of La 0.7−x Y x Ca 0.3 MnO 3 , with Y concentrations x = 0, 0.10, and 0.15. Yttrium doping yielded the appearance of a cluster-glass state, giving rise to unusual low-temperature behavior of the specific-heat. The main feature observed in the results is a strong enhancement of the specific-heat linear term, which is interpreted as a direct consequence of magnetic disorder. The analysis was further corroborated by resistivity measurements in the same compounds.

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“…The difference between the ZFC and FC magnetizations is much higher in the cluster-glass phase (Samples 1 and 2) compared to the spin-glass phase (Sample 3), reflecting the presence of FM order within the clusters. 11 Isothermal M vs. H curves measured at 10 K are plotted in Fig. 3.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Specific heat and magnetic order inLaMnO3+δ

et al. 1999

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Magnetic and specific-heat measurements are performed in three different samples of LaMnO 3+δ , with δ = 0.11, 0.15 and 0.26, presenting important disorder effects, such as carrier localization, due to high amounts of La and Mn vacancies. For the samples with δ = 0.11 and 0.15, magnetic measurements show signatures of a two-step transition: as the temperature is lowered, the system enters a ferromagnetic phase followed by a disorder-induced cluster-glass state. Spin-wave-like contributions and an unexpected large linear term are observed in the specific heat as a function of temperature. In the sample with the highest vacancy content, δ = 0.26, the disorder is sufficient to suppress even short-range ferromagnetic order and yield a spin-glass-like state.75.40. Cx, 75.30.Ds

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Static and dynamic response of cluster glass inLa0.5Sr0.5

Cited by 338 publications

References 15 publications

Magnetism and cluster glass dynamics in geometrically frustrated LuFe2O4

Magnetism and cluster glass dynamics in geometrically frustrated LuFe2O4

Disorder effects at low temperatures in La0.7−xYxCa0.3MnO3 manganites

Specific heat and magnetic order inLaMnO3+δ

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