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Superconductivity up to 10 K in the Sr(Pd1− x Pt x )2Ge2 layer system
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10.1063/1.4808287
/content/aip/journal/jap/113/21/10.1063/1.4808287
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4808287

Figures

Image of FIG. 1.
FIG. 1.

X-ray powder-diffraction patterns for (a) SrNiGe with stable bct phase (space group ), (b) SrPdGe with stable bct phase, and (c)SrPtGe with stable monoclinic phase (space group ). The asterisks indicate the possible positions of metastable bct phase.

Image of FIG. 2.
FIG. 2.

Crystal structure of (a) stable monoclinic SrPtGe (space group ) and (b) metastable bct structure (space group ). Instead of two PtGe layers in the bct structure, the monoclinic structure contains one PtGe layer and one GePt layer with interchanged Pt and Ge atomic positions.

Image of FIG. 3.
FIG. 3.

Molar magnetic susceptibility in both 10-G FC and ZFC modes are superimposed of molar heat capacity () for the stable bct SrPdGe compound with bulk of 3.2 K.

Image of FIG. 4.
FIG. 4.

Molar magnetic susceptibility of SrPtGe compound under low applied magnetic fields in both FC and ZFC modes. onset at 10.2 K was observed, a much smaller diamagnetic signal indicates that the superconductivity is not from the stable monoclinic phase but from the metastable bct phase as in SrPdGe.

Image of FIG. 5.
FIG. 5.

Diamagnetic hysteresis curves at for superconducting SrPtGe.

Image of FIG. 6.
FIG. 6.

X-ray powder-diffraction patterns of three Sr(Pd Pt)Ge compounds ( = 0.1, 0.25, and 0.5). Stable monoclinic phase mixed with minor metastable bct phase was observed with 25% and 50% Pt substitution.

Image of FIG. 7.
FIG. 7.

Molar magnetic susceptibility of five Pt-poor compounds Sr( Pt)Ge ( = 0, 0.1, 0.15, 0.2, and 0.25) in 20-G ZFC mode. Bulk was observed for with the stable bct phase. Metastable was observed for  = 0.2 and 0.25.

Image of FIG. 8.
FIG. 8.

Molar magnetic susceptibility of three Pt-rich compounds Sr( Pt)Ge ( = 0.5, 0.7, and 1.0) in 20-G ZFC modes. Metastable increases from 7.5 K for  = 0.5 to 10.2 K for  = 1.0.

Image of FIG. 9.
FIG. 9.

Variation of superconducting transition temperatures (x) for the Sr( Pd)Ge system and the Sr( Pt)Ge system ( ). Structural phase transition from bct to monoclinic occurs near .

Tables

Generic image for table
Table I.

Atomic positions of stable monoclinic SrPtGe (space group , No. 4) with lattice parameters  = 0.4401(4) nm,  = 0.4435(4) nm,  = 0.9764(10) nm, and .

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/content/aip/journal/jap/113/21/10.1063/1.4808287
2013-06-03
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconductivity up to 10 K in the Sr(Pd1−xPtx)2Ge2 layer system
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/21/10.1063/1.4808287
10.1063/1.4808287
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