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Bertrand, Dominique; Mauger, A.; Ferré, J.; Beauvillain, P.

doi:10.1103/physrevb.45.507

Cited by 17 publications

(10 citation statements)

References 13 publications

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“…Restricting the scaling analysis to x"(T) data corresponding to temperatures above the maxima in these curves results in zv -10. 24 Another reason for not including x"(T) data corresponding to temperatures close to and below T g , is the influence of ageing resulting in xi u ) being time dependent. 25 Using such data in the scaling analysis will inevitably yield departures from scaling.…”

Section: Resultsmentioning

confidence: 99%

Experiments on Spin Glasses

Nordblad

Svedlindh

1997

Series on Directions in Condensed Matter Physics

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Static and dynamic scaling of the susceptibility of 3d spin glasses is found to yield consistent results and imply that there is a zero field phase transition at a finite temperature. On the other hand, dynamic scaling analysis of the in-field behaviour suggests that there is no phase transition in an applied magnetic field. The ageing phenomenon in spin glasses as observed in the response function and the field cooled magnetisation is discussed and a phenomenological picture for how it relates to the underlying spin configuration is derived.

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Section: Resultsmentioning

confidence: 99%

Experiments on Spin Glasses

Nordblad

Svedlindh

1997

Series on Directions in Condensed Matter Physics

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“…We comment that Geschwind and co-workers, 28 using linear scaling plots, found ␥ϭ4.4 in Cd 1Ϫx Mn x Te. This higher value of ␥ was debated by Bertrand et al, 10 who suggested that the larger value of ␥ obtained by Geschwind et al was due to the use of an incorrect value for T c in the scaling plot. This debate notwithstanding, we conclude that within our experimental error, there is fair agreement between values for the critical exponent ␥ obtained in Zn 1Ϫx Mn x Te and Cd 1Ϫx Mn x Te.…”

Section: B Magnetization Measurementsmentioning

confidence: 95%

“…However, as the critical point is approached, different model-dependent scaling functions should approach constant values. In addition, on the basis of an analysis of the spin autocorrelation function, Bertrand et al 10 have argued that Eq. ͑3͒ is only valid for temperatures TϾT p , where T p is the temperature at which the peak in Љ(,T) occurs.…”

Section: A Ac Susceptibility Measurementsmentioning

confidence: 99%

“…[1][2][3][4] Recently, the prototypical DMS Cd 1Ϫx Mn x Te has been the subject of continued theoretical and experimental investigations in an attempt to firmly establish that this material undergoes a continuous phase transition from paramagnetism to a spin-glass state. [5][6][7][8][9][10][11][12] If indeed Cd 1Ϫx Mn x Te is a spin glass, then are all DMS alloys also spin glasses with the same critical exponents despite differences in exchange strengths and anisotropy? Cd 1Ϫx Mn x Te and other DMS alloys such as Hg 1Ϫx Mn x Te and Zn 1Ϫx Mn x Te are randomly site-disordered, semiconducting materials with short-range antiferromagnetic ͑super-exchange͒ interactions between the Heisenberg spins.…”

Section: Introductionmentioning

confidence: 99%

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Spin-glass ordering in the diluted magnetic semiconductorZn1−xMnxTe

et al. 1998

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We have performed both ac susceptibility and dc magnetization measurements on the diluted magnetic semiconductor Zn 1Ϫx Mn x Te. The measurements clearly indicate spin-glass behavior. For samples with concentrations xϭ0.51 and xϭ0.41, the data for the imaginary part of the complex susceptibility (Љ) were analyzed according to conventional power-law dynamics and good scaling was obtained with the critical exponent values zϭ10Ϯ2 and ␤ϭ1.0Ϯ0.2. These values of z and ␤ are consistent with results obtained in other insulating spin-glass systems with short-range interactions. Because of the presence of significant Dzyaloshinsky-Moriya anisotropy in these materials, an attempt was also made to fit the data using an activated dynamics model. However, the scaling of the Љ data was less satisfactory in this case. Magnetization measurements on the xϭ0.51 sample also showed a spin-glass-like transition. Scaling of the nonlinear magnetization just above the transition gave T c ϭ20.8Ϯ0.2 K, and the critical exponent values ␥ϭ4.0Ϯ1.0 and ␤ ϭ0.8Ϯ0.2. The value of T c obtained from the static magnetization measurements is in good agreement with the value T c ϭ20.7Ϯ0.05 K obtained from the dynamic scaling analysis. Further, the value for the critical exponent ␥ obtained in this work is in fair agreement with values reported for other spin-glass materials. These results represent convincing evidence that diluted magnetic semiconductors are a subset of the class of insulating spin-glass materials with short-range interactions.

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“…Only data at temperatures above that of the peak in ′′ χ ( f , T ) were included in the scaling plot. 33 . The best scaling was obtained for the following values: 19 which is likely an indication of deep underlying similarities in the nature of the interactions and the interacting entities in both systems.…”

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confidence: 99%