Palladium site ordering and the occurrence of superconductivity in Bi2Pd3Se2−xSx

Weihrich, Richard; Matar, Samir F.; Anusca, Irina; Pielnhofer, Florian; Peter, Philipp; Bachhuber, Frederik; Eyert, V.

doi:10.1016/j.jssc.2011.01.037

Cited by 12 publications

(9 citation statements)

References 32 publications

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“…Pd 3 Bi 2 S 2 crystallizes in cubic symmetry (space group I 2 1 3), with lattice parameter a = 8.3095(1) Å, whereas Pd 3 Bi 2 Se 2 adopts a monoclinic structure (space group C 2/ m ) with the following lattice parameters: a = 11.748(2) Å, b = 8.432(2) Å, c = 8.425(2) Å, and β = 133.96(1)°. The computed atomic coordinates and displacement parameters (see Tables S1–S3) show no significant discrepancies with respect to the previously published data. , The reflections of the as-prepared compounds are broad, suggesting the formation of small particles. Particle size calculations employing the Scherrer equation yield average particle sizes of 34 and 30 nm for Pd 3 Bi 2 S 2 and Pd 3 Bi 2 Se 2 , respectively.…”

Section: Results and Discussionmentioning

confidence: 51%

“…Electronic band structure calculations for Bi-containing parkerite-type materials revealed Bi(6p) bands crossing the Fermi level, thus implying metallic-type conductivity, and the DOS at E F mainly dominated by Bi(6p) states. A weak DOS maximum at E F points toward flat bands . From the standpoint of crystallography, the Pd 3 Bi 2 Se 2 structure possesses monoclinic symmetry (space group C 2/ m ) and can be described as consisting of quasi-two-dimensional nets formed by Pd and Bi as well as Pd and Se atoms .…”

Section: Introductionmentioning

confidence: 99%

“…A weak DOS maximum at E F points toward flat bands . From the standpoint of crystallography, the Pd 3 Bi 2 Se 2 structure possesses monoclinic symmetry (space group C 2/ m ) and can be described as consisting of quasi-two-dimensional nets formed by Pd and Bi as well as Pd and Se atoms . In contrast, the analogous sulfide compound Pd 3 Bi 2 S 2 shows a cubic structure (space group I 2 1 3) .…”

Section: Introductionmentioning

confidence: 99%

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Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

et al. 2016

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Pd3Bi2S2 and Pd3Bi2Se2 have been successfully prepared in the form of nanoparticles with diameters of ∼50 nm by microwave-assisted modified polyol synthesis at low temperatures. The composition and morphology of the samples have been studied by means of powder X-ray diffraction as well as electron microscopy methods, including X-ray intensity mapping on the nanoscale. Superconducting properties of the as-prepared samples have been characterized by electrical resistivity measurements down to low temperatures (∼0.2 K). Deviations from the bulk metallic behavior originating from the submicrometer nature of the samples were registered for both phases. A significant critical-field enhancement up to 1.4 T, i.e., 4 times higher than the value of the bulk material, has been revealed for Pd3Bi2Se2. At the same time, the critical temperature is suppressed to 0.7 K from the bulk value of ∼1 K. A superconducting transition at 0.4 K has been observed in nanocrystalline Pd3Bi2S2. Here, a zero-temperature upper critical field of ∼0.5 T has been estimated. Further, spark plasma-sintered Pd3Bi2S2 and Pd3Bi2Se2 samples have been investigated. Their superconducting properties are found to lie between those of the bulk and nanosized samples.

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Section: Results and Discussionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

et al. 2016

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“…Overall, the TEM analysis of the annealed flake shows that the Pd is absorbed by the Bi 2 Se 3 flake during the annealing process and that the absorption occurs uniformly with a leading edge across the flake. Although superconductivity has been reported before in several compounds containing Pd and Bi or Se [27][28][29] , Bi:Se ratio suggests that it is unlikely that such compounds are forming in our samples. Since the Bi:Se ratio is fairly constant across the sample, the Pd is most likely intercalated in the Bi 2 Se 3 flake.…”

mentioning

confidence: 64%

“…Overall, the TEM analysis of the annealed flake shows that the Pd is absorbed by the Bi 2 Se 3 flake during the annealing process and that the absorption occurs uniformly with a leading edge across the flake. Although superconductivity has been reported before in several compounds containing Pd and Bi or Se, − transport data and the TEM analysis do not show that such compounds are forming in our samples.…”

Section: Resultsmentioning

confidence: 99%

Patterning Superconductivity in a Topological Insulator

Mlack

Rahman

Danda³

et al. 2017

ACS Nano

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Topologically protected states in combination with superconductivity hold great promise for quantum computing applications, but the progress on electrical transport measurements in such systems has been impeded by the difficulty of fabricating devices with reliable electrical contacts. We find that superconductivity can be patterned directly into BiSe nanostructures by local doping with palladium. Superconducting regions are defined by depositing palladium on top of the nanostructures using electron beam lithography followed by in situ annealing. Electrical transport measurements at low temperatures show either partial or full superconducting transition, depending on the doping conditions. Structural characterization techniques indicate that palladium remains localized in the targeted areas, making it possible to pattern superconducting circuits of arbitrary shapes in this topological material.

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From3DIntermetallic Antiperovskites to2DHalf Antiperovskites

Weihrich

Köhler

Pielnhofer

et al. 2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The concept of ordered half antiperovskites (HAP) derives A 2 M 3 X 2 structures formally from metal‐rich intermetallic antiperovskites AM 3 X such as MgNi 3 C. It was developed within the last decade in Regensburg accompanied by fascinating discoveries of other groups. It extends the idea known for oxide structures related to perovskite such as cuprate superconductors: therein, the 3D M‐O network is cut to 2D sheets, that is YBaCu 2 O 7‐d . By systematic formation of unoccupied sites 3D interlinked MO 6 octahedra in perovskites are cut to 2D substructures with CuO 4 and CuO 5 units. To the best of our knowledge, a similar scheme was not described for antiperovskites AM 3 X, where X and M sites of perovskites are exchanged. MgNi 3 C is taken subsequently as reference example. First reported by Hütter and Stadelmaier it became famous as noncuprate nonoxide superconductor. We show that MX 6 and XM 6 units in perovskites AMX 3 and APs AM 3 X can be cut to MX 3 and XM 3 units to form 2D structures. The situation compares to gray As and black P that are derived from a primitive α‐Po structure by cutting three of the six bonds. In both cases, interlinked 3D networks are cut to 2D structures. However, the ternary compounds introduce additional degrees of freedom by varying the electron count by composition that turns out important to design properties such as for example magnetism and thermoelectrics of superconductivity. Consequently, the HAP concept consists of a crystal structure part for compounds A 2 M 3 X 2 = AM 3/2 L 3/2 X with AP superstructures and an electronic structure part. In this review, we point out relations to antiperovskite AM 3 X crystal and electronic structures, the history of A 2 M 3 X 2 compounds, the HAP concept, important discoveries of HAP materials and novel investigations on synthesis, spintronics, thermoelectrics, superconductors, and topological properties. Advantages of the given conceptual view are pointed out for computer modeling, design, and prediction of structures and functions.

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Palladium site ordering and the occurrence of superconductivity in Bi2Pd3Se2−xSx

Cited by 12 publications

References 32 publications

Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Patterning Superconductivity in a Topological Insulator

From3DIntermetallic Antiperovskites to2DHalf Antiperovskites

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Palladium site ordering and the occurrence of superconductivity in Bi2Pd3Se2−xSx

Cited by 12 publications

References 32 publications

Downscaling Effect on the Superconductivity of Pd3Bi2X2 (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Downscaling Effect on the Superconductivity of Pd3Bi2X2 (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Patterning Superconductivity in a Topological Insulator

From3DIntermetallic Antiperovskites to2DHalf Antiperovskites

Contact Info

Product

Resources

About

Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis