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Anomalies in electron spin resonance spectra of diluted magnetic semiconductors
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10.1063/1.3504604
/content/aip/journal/jap/108/9/10.1063/1.3504604
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/9/10.1063/1.3504604

Figures

Image of FIG. 1.
FIG. 1.

Magnetization hysteresis loops for (; ; ) at . On the insets: left-the typical XRD patterns of powder samples illustrating two crystal phases observed under variation in manganese content ; right-the temperature dependence of the inverse susceptibility , corrected by the temperature-independent contribution, above and the square of the magnetization below for indicating the independent determination of the Curie–Weiss temperature and the FM transition temperature .

Image of FIG. 2.
FIG. 2.

Typical temperature evolution of the first derivative absorption line for the samples [(a) (nonoriented single crystal); (b) (powder)]: black points—experimental data, solid lines—fits in the frame of Dyson’s theory [Eq. (2)]. Intensity of ESR signal decreases with increase in the temperature. The inset represents an example of fitting along with two resolved lines: dashed one corresponds to broad component, while dotted one—to narrow line.

Image of FIG. 3.
FIG. 3.

Temperature dependencies of the effective -factor (a) and linewidth (b) derived from one-line fitting (low temperature range) and two-line fitting [Eq. (2)] for broad and narrow components of ESR spectra in powder samples of different alloy composition: ; ; ; . Solid curves are approximations in the framework of modified Huber’s theory [Eq. (3)]. Dotted and solid lines are guides for eyes. On the inset-concentration dependence of the linewidth for broad and narrow components of ESR spectra at two different temperatures (, ).

Tables

Generic image for table
Table I.

Parameters of modified Huber’s theory [Eq. (3)] for two spectral components in along with magnetization data on FM ordering temperature and paramagnetic Curie–Weiss temperature . Indexes 1 and 2 correspond to broad and narrow components of the ESR spectra, respectively.

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/content/aip/journal/jap/108/9/10.1063/1.3504604
2010-11-10
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anomalies in electron spin resonance spectra of Ge1−xMnxTe diluted magnetic semiconductors
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/9/10.1063/1.3504604
10.1063/1.3504604
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