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Magnetism, magnetoresistance, and Shubnikov-de Haas oscillations in Na-implanted highly oriented pyrolitic graphite
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10.1063/1.4709731
/content/aip/journal/jap/111/9/10.1063/1.4709731
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4709731

Figures

Image of FIG. 1.
FIG. 1.

Magnetization of the virgin HOPG sample (G-pure) at T = 30 K in fields applied (a) parallel and (b) perpendicular to the c-axis. The inset magnifies the ferromagnetic-like hysteresis cycle observed in the low-field magnetization perpendicular to the c-axis.

Image of FIG. 2.
FIG. 2.

Hysteresis cycles measured in fields varying between −2 T and +2 T when applied perpendicular to the c-axis of the studied Na implanted HOPG samples. The diamagnetic background is subtracted.

Image of FIG. 3.
FIG. 3.

Saturation magnetization at T = 30 K (represented as squares) of the ferromagnetic-like response for the pure and Na-implanted HOPG samples and the corresponding planar magnetoresistance magnitudes (circles) measured in = 5 T at the same temperature.

Image of FIG. 4.
FIG. 4.

Magnetoresistance perpendicular to the c-axis as a function of the applied field for the quoted samples. The measurements were performed at T = 2 K. The inset shows the configuration adopted for attaching the electrical contacts and schematizes the expected current flow.

Image of FIG. 5.
FIG. 5.

Shubnikov-de Haas oscillations in the magnetoresistance of the virgin HOPG sample at the quoted temperatures. The temperature dependence of the oscillation amplitudes labelled as I and II were analysed with Eq. (3) for samples GNa-1 and GNa-2.

Image of FIG. 6.
FIG. 6.

Shubnikov-de Haas oscillations in the magnetoresistance of the virgin and Na implanted GNa-1 and GNa-2 HOPG samples at T = 2 K. The inset shows the amplitude of the fast Fourier transform applied to results for the G-pure sample.

Image of FIG. 7.
FIG. 7.

Fitting of the Lifshitz-Kosevich factor (see Eq. (3)) to the temperature dependent amplitude of the oscillation denoted as II in Fig. 5, but for the GNa-1 sample.

Tables

Generic image for table
Table I.

Parameters for Na implantation in HOPG.

Generic image for table
Table II.

Cyclotron frequencies and effective masses corresponding to oscillations III and IV in the SdH spectra for the samples G-pure, G(Na)-1, and G(Na)-1.

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/content/aip/journal/jap/111/9/10.1063/1.4709731
2012-05-11
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism, magnetoresistance, and Shubnikov-de Haas oscillations in Na-implanted highly oriented pyrolitic graphite
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4709731
10.1063/1.4709731
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