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Superconductivity in the vicinity of ferromagnetism in oxygen free perovskite MgCNi3: An experimental and density functional theory study
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10.1063/1.3679564
/content/aip/journal/jap/111/3/10.1063/1.3679564
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3679564
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Rietveld fitted XRD pattern of Mg1.2C1.6Ni3 samples with space group Pm3 m synthesized in various heating conditions.

Image of FIG. 2.
FIG. 2.

(Color online) (a) DC magnetic susceptibility M(T) in ZFC and FC situations at 10 Oe of MgCNi3, (b) and (c) real and imaginary part of AC susceptibility, measure at 333 Hz and 7 Oe of MgCNi3, respectively.

Image of FIG. 3.
FIG. 3.

(Color online) AC magnetic susceptibility in both real (M′) and imaginary (M′′) situations at fixed frequency of 333 Hz and varying amplitudes of 3-11 Oe for MgCNi3.

Image of FIG. 4.
FIG. 4.

(Color online) Isothermal magnetization (MH) plots at 2, 4, and 6 K in low field range of <1000 Oe for MgCNi3. The lower critical field (Hc1 ) is marked.

Image of FIG. 5.
FIG. 5.

(Color online) Isothermal magnetization (MH) plots at 2 K in high field range of up to 120 kOe in four quadrants for MgCNi3. Inset shows expanded MH plots at 2 K in the low field range of up to 30 kOe in four quadrants for MgCNi3. The Hirr is marked.

Image of FIG. 6.
FIG. 6.

(Color online) Isothermal magnetization (MH) for the real part of AC susceptibility (M′) with applied field of up to 140 kOe at 2 K for MgCNi3. The upper critical field (Hc2 ) is marked.

Image of FIG. 7.
FIG. 7.

(Color online) Isothermal magnetization (MH) plot at 20 K in low field range of <1000 Oe which indicates the ferromagnetic nature. Inset (a)shows DC magnetization in ZFC and FC situation at 1000 Oe applied field. Inset (b) shows isothermal magnetization (MH) plots at 20, 50, 100, 200, and 300 K in the field range of <50 kOe for MgCNi3.

Image of FIG. 8.
FIG. 8.

(Color online) Electronic DOS for MgCNi3 and contribution of Ni and C states. Inset shows results of fixed spin moment (FSM) calculations done on stoichiometric MgCNi3.

Image of FIG. 9.
FIG. 9.

(Color online) Heat capacity vs temperature Cp (T) plot of MgCNi3 in the temperature range of 2-250 K without applied magnetic field. Inset (a) shows linear fitting of Cp/T vs T 2 – 140 kOe curve (normal state). Inset (b) shows Cp/T vs T 2 plots in magnetic fields 0-140 kOe.

Image of FIG. 10.
FIG. 10.

(Color online) Single gap fitting of electronic specific heat below transition temperature (Tc ) using the α-model.

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/content/aip/journal/jap/111/3/10.1063/1.3679564
2012-02-06
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconductivity in the vicinity of ferromagnetism in oxygen free perovskite MgCNi3: An experimental and density functional theory study
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3679564
10.1063/1.3679564
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