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Superconducting properties of new heterofullerides
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10.1063/1.4776231
/content/aip/journal/ltp/39/1/10.1063/1.4776231
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/1/10.1063/1.4776231

Figures

Image of FIG. 1.
FIG. 1.

NMR spectrum for the heterofulleride K2AlC60.

Image of FIG. 2.
FIG. 2.

X-ray diffraction patterns for K2AlC60 (a) and K2AlHg x C60 (b).

Image of FIG. 3.
FIG. 3.

X-ray diffraction patterns for K2MgC60 (a) and K2MgHg x C60 (b).

Image of FIG. 4.
FIG. 4.

X-ray diffraction pattern for K2GaHg x C60.

Image of FIG. 5.
FIG. 5.

Raman spectra for the fullerides K2BeC60, K2MgC60, and K3C60, and for C60 for comparison. The vertical lines show the positions of the peaks of the main phonon modes.

Image of FIG. 6.
FIG. 6.

Positions of the Ag (2) line maxima in the Raman spectra for C60, for the fullerides K2MgC60 and K2BeC60, and for K3C60 for comparison.

Image of FIG. 7.
FIG. 7.

EPR spectra of heterofullerides K2BeC60, Rb2BeC60, K2MgC60, KMg2C60, and Rb3C60, measured at room temperature. The Mn2+ reference signal is shown on the lower curve.

Image of FIG. 8.
FIG. 8.

An example of the decomposition of the EPR spectrum of KMg2C60 into two Lorentzian lines at room temperature. The circles denote the experimental data (1), the dashed and dotted lines—the broad (2) and narrow (3) Lorentzian lines, respectively.

Image of FIG. 9.
FIG. 9.

The temperature dependence of the value inversely proportional to the magnetic susceptibility of the fulleride KMg2C60. The experimental data for the broad ( ) and narrow ( ) lines in the EPR spectrum are shown separately. Best fit lines are shown.

Image of FIG. 10.
FIG. 10.

The dependence of the magnetic susceptibility of fullerides K3C60, K2BeC60, and Rb2BeC60 on temperature.

Image of FIG. 11.
FIG. 11.

The dependence of the magnetic susceptibility of fullerides K2MgC60, K2MgHg x C60 and K2GaHg x C60 on temperature.

Image of FIG. 12.
FIG. 12.

The temperature dependence of the magnetic susceptibility of fullerides K2AlC60 (obtained in the solvents toluene and tetrahydrofuran (THF)) and K2AlHg x C60 (obtained through an amalgam).

Image of FIG. 13.
FIG. 13.

The temperature dependence of the magnetic susceptibility of fullerides Rb2AlHg x C60, Rb2MgC60 and Rb2MgHg x C60.

Image of FIG. 14.
FIG. 14.

The dependence of the superconducting transition temperature on the lattice parameter a for the investigated heterofullerides K2MC60, Rb2MC60, where M = Be, Mg, Al, Ga (a) and for heterofullerides with Cs (b).

Tables

Generic image for table
Table I.

Composition of fullerides, the temperature of the superconducting transition Tc , lattice parameters, and phase composition of the reaction products.

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/content/aip/journal/ltp/39/1/10.1063/1.4776231
2013-01-29
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconducting properties of new heterofullerides
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/1/10.1063/1.4776231
10.1063/1.4776231
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