ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Treffer pro Seite

Treffer 1 - 3 | 3 Treffer

Sortierung

Digitale Medien

Spin-glass behavior of Zn1−xCoxS (1990)

Shand, P. M. ; Lewicki, A. ; Crooker, B. C. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 67 (1990), S. 5246-5248

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The magnetic susceptibility of the new cobalt-based dilute magnetic semiconductor Zn1−x Cox S was measured for concentrations 0.03≤x≤0.103 and temperatures 22 mK≤T≤4.2 K. A paramagnetic-to-spin-glass transition was found for all samples. In contrast to the behavior in the manganese-based compounds, the freezing temperatures in this material could not be fitted to a simple power-law dependence on concentration. This difference is discussed in terms of an additional long-range dipolar coupling.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.344625

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

Spin glass behavior of Zn1−xMnxTe : The 40th annual conference on magnetism and magnetic materials (1996)

Shand, P. M. ; Christianson, A. D. ; Martinson, L. S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 6164-6166

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We have performed ac susceptibility and dc magnetization measurements on the diluted magnetic semiconductor Zn1−xMnxTe. The measurements clearly indicate spin glass behavior. For an x=0.4 sample, the data for the imaginary part of the complex susceptibility (χ″) was analyzed according to conventional power-law dynamics and good scaling was obtained with Tc=13.4±0.2 K, zν=10.5±1.0, and β=0.9±0.2. These values of zν and β are consistent with results obtained in other spin glass systems. The scaling of the χ″ data was not as good when analyzed within the activated dynamics model. Magnetization measurements of an x=0.5 sample also showed a spin glass-like transition. Scaling of the nonlinear magnetization just above the transition gave Tc=20.8±0.2 K, and the critical exponent values β=0.8±0.2 and γ=4.0±1.0. This confirms the β value obtained from the ac measurements and the γ value is in fair agreement with reported values for other diluted magnetic semiconductor spin glass systems. We conclude that Zn1−xMnxTe and similar systems undergo equilibrium phase transitions to a spin glass state at low temperatures. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.362060

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Digitale Medien

Magnetic behavior of (CuIn)1−xMn2xTe2 : 38th Annual Conference on Magnetism and Magnetic Materials (1994)

Shand, P. M. ; Polstra, P. A. ; Miotkowski, I. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 5731-5733

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Magnetic susceptibility measurements have been made on the chalcopyrite diluted magnetic semiconductor (CuIn)1−xMn2xTe2 for concentrations 0.01≤x≤0.101 and temperatures 33 mK≤T≤300 K. Samples with x(approximately-greater-than)0.05 had similar values of the effective nearest-neighbor exchange constant, with Jeff/kB≈−18.5 K. The strength of Jeff fell sharply in samples with lower x, a characteristic not seen in wide band gap II–VI based alloys. Low-field ac susceptibility measurements showed spin-glass behavior. Analysis of freezing temperature Tf vs x data showed a possible crossover between different modes of exchange, coincident with the sharp drop in Jeff. Preliminary carrier concentration data suggests that the crossover may be driven by increased numbers of free holes in some samples.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.355597

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Treffer 1 - 3 | 3 Treffer