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• W1982368448 endingPage "1396" @default.
• W1982368448 startingPage "1384" @default.
• W1982368448 abstract "Alternating current susceptibility measurements on powdered samples of the spin-glass $mathrm{Cu}mathrm{Mn}$ (Mn concentrations: $0.23<~c<~6.3$ at.%) showed relatively broad maxima as well as sharp cusps in ${ensuremath{chi}}^{ensuremath{'}}$ as a function of temperature depending on the method of preparing the sample. In contrast to the broadly peaked ${ensuremath{chi}}^{ensuremath{'}}(T)$ curves, the sharply cusped ones were more affected by small, external, static fields $H$. This field dependence was measured at various temperatures above and below ${T}_{f}$, the freezing temperature. At ${T}_{f}$ the behavior of ${ensuremath{chi}}^{ensuremath{'}}(H)$ was analyzed and the critical exponent $ensuremath{delta}$ determined. The susceptibility data for the lower concentration alloys were independent of the measurement frequency ($1 mathrm{Hz}<ensuremath{nu}<10 mathrm{kHz}$) within the absolute experimental accuracy of about 1%. However, in the concentration regime of ensuremath{approx} 1 at.% Mn and above, the sharply cusped, so-called quenched samples exhibited a small frequency dependence in ${ensuremath{chi}}^{ensuremath{'}}(T)$ near ${T}_{f}$. The relative shift in freezing temperature $ensuremath{Delta}frac{{T}_{f}}{{T}_{f}}$ per decade of frequency was found to be 0.0050 independent of concentration from 1 to 6.3 at.% Mn. Below ${T}_{f}$ the various ${ensuremath{chi}}^{ensuremath{'}}(ensuremath{nu})$ curves seemed to converge towards a single, nonzero ${ensuremath{chi}}^{ensuremath{'}}$ value as $Tensuremath{rightarrow}0$ K. Above ${T}_{f}$ and below about 50 K, the susceptibility obeyed a simple Curie-like law, whereas in the higher temperature region from 100 to 150 K a Curie-Weiss-like behavior was observed with a small, positive paramagnetic Curie-Weiss temperature. To analyze the behavior of ${ensuremath{chi}}^{ensuremath{'}}(T)$ near ${T}_{f}$ and at the lowest temperatures of measurement 0.4 K, the superparamagnetic blocking model of Wohlfarth was used. A distribution of blocking temperatures was thus determined from the experimental ${ensuremath{chi}}^{ensuremath{'}}$ data. This distribution function shows a rather sharp step at ${T}_{f}$, indicating that there are cooperative effects in the freezing of a spin-glass." @default.
• W1982368448 created "2016-06-24" @default.
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• W1982368448 date "1981-02-01" @default.
• W1982368448 modified "2023-10-16" @default.
• W1982368448 title "Susceptibility of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>Cu</mml:mi><mml:mi /><mml:mi mathvariant=normal>Mn</mml:mi></mml:math>spin-glass: Frequency and field dependences" @default.
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• W1982368448 doi "https://doi.org/10.1103/physrevb.23.1384" @default.
• W1982368448 hasPublicationYear "1981" @default.
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