A superconducting ternary sulfide Ag2Pd3S

Khan, H.R.; Trunk, H.; Raub, Ch.J.; Fertig, W.A.; Lawson, A.C.

doi:10.1016/0022-5088(73)90020-9

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…The value T c = 2.25 K for Ag 2 Pd 3 S is about two times larger than values previously reported [25,26]. Since we were unable to prepare samples that have a lower transition temperature in this research, it is hard to understand experimentally why the T c values are different from each other.…”

contrasting

confidence: 42%

“…Thirty years later, Schaak et al reported that Ag 2 Pd 3 S could be synthesized by the rapid low-temperature solution method [26]. However, details of the crystal structure have not been completely resolved due to the difficulty of structural analysis of polycrystalline samples, although the basic crystal structure of Ag 2 Pd 3 S was expected to be the β-Mn-type structure [25,26]. In addition, superconducting properties also remain poorly understood.…”

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confidence: 99%

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Superconductivity in noncentrosymmetric Ag2Pd3S

et al. 2017

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We have successfully synthesized the single crystal of Ag 2 Pd 3 S, which exhibits superconductivity with the transition temperature of T c = 2.25 K. Ag 2 Pd 3 S crystallizes in the space group P 4 1 32 with the filled β-Mn structure, which has no inversion symmetry. The value of the Ginzburg-Landau parameter κ GL indicates that Ag 2 Pd 3 S is a type-II superconductor. C(T c )/γ n T c = 1.50 and 2 /k B T c = 3.48 from the heat-capacity analyses indicate that Ag 2 Pd 3 S is a weak-coupling Bardeen-Cooper-Schrieffer (BCS) superconductor with an isotropic superconducting gap. On the other hand, the violation of the Werthamer-Helfand-Hohenberg curve in the H -T phase diagram implies Ag 2 Pd 3 S is not a typical BCS superconductor.

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confidence: 42%

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confidence: 99%

Superconductivity in noncentrosymmetric Ag2Pd3S

et al. 2017

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“…XRD patterns for the Ag 2 S−Pd nanocomposite heated for 30 min at 300 and 500 °C are shown in Figure . Ag 2 Pd 3 S adopts the β-Mn structure, which is distinct from any structures that exist in the constituent unary and binary systems. The XRD data show that the diffusion and nucleation steps are complete within 30 min of heating, yielding the desired ternary phase.…”

Section: Resultsmentioning

confidence: 93%

“…For proof-of-concept purposes, we chose the Ag−Pd−S system to demonstrate the formation of a ternary phase. − Nanocrystals of Ag 2 S and Pd are easily synthesized according to literature methods, , and can serve as robust precursors to ternary Ag−Pd−S phases. Ag 2 S nanocrystals were synthesized, isolated by centrifugation, washed, and then added to a freshly prepared solution of PVP-stabilized Pd nanocrystals 21 in a 1:3 ratio of Ag 2 S to Pd.…”

Section: Resultsmentioning

confidence: 99%

“…Both Ag 2 S and Pd nanocrystals are stable in solution, but when they are mixed together, a precipitate begins forming within minutes, and the resulting powder is easily isolated by centrifugation. The Ag 2 S and Pd nanoparticles were mixed in a 1:3 ratio, since that stoichiometry (Ag 2 Pd 3 S) matches a known ternary phase that is superconducting at T c = 1.13 K 7 Powder XRD patterns for Pd nanoparticles, Ag 2 S nanoparticles, the Ag 2 S−Pd nanocomposite (1:3 stoichiometry) at room temperature, and the Ag 2 S−Pd nanocomposite heated to 300 and 500 °C for 60 min, showing the formation of intermetallic Ag 2 Pd 3 S. The tick marks below the peaks for Ag 2 Pd 3 S (500 °C) represent the peak positions from PDF Card 27-1156 (AgPd 2 S, which subsequent papers reported to be identical to the Ag 2 Pd 3 S superconductor).…”

Section: Resultsmentioning

confidence: 99%

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Metallurgy in a Beaker: Nanoparticle Toolkit for the Rapid Low-Temperature Solution Synthesis of Functional Multimetallic Solid-State Materials

et al. 2005

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Intermetallic compounds and alloys are traditionally synthesized by heating mixtures of metal powders to high temperatures for long periods of time. A low-temperature solution-based alternative has been developed, and this strategy exploits the enhanced reactivity of nanoparticles and the nanometer diffusion distances afforded by binary nanocomposite precursors. Prereduced metal nanoparticles are combined in known ratios, and they form nanomodulated composites that rapidly transform into intermetallics and alloys upon heating at low temperatures. The approach is general in terms of accessible compositions, structures, and morphologies. Multiple compounds in the same binary system can be readily accessed; e.g., AuCu, AuCu3, Au3Cu, and the AuCu-II superlattice are all accessible in the Au-Cu system. This concept can be extended to other binary systems, including the intermetallics FePt3, CoPt, CuPt, and Cu3Pt and the alloys Ag-Pt, Au-Pd, and Ni-Pt. The ternary intermetallic Ag2Pd3S can also be rapidly synthesized at low temperatures from a nanocomposite precursor comprised of Ag2S and Pd nanoparticles. Using this low-temperature solution-based approach, a variety of morphologically diverse nanomaterials are accessible: surface-confined thin films (planar and nonplanar supports), free-standing monoliths, nanomesh materials, inverse opals, and dense gram-scale nanocrystalline powders of intermetallic AuCu. Importantly, the multimetallic materials synthesized using this approach are functional, yielding a room-temperature Fe-Pt ferromagnet, a superconducting sample of Ag2Pd3S (Tc = 1.10 K), and a AuPd4 alloy that selectively catalyzes the formation of H2O2 from H2 and O2. Such flexibility in the synthesis and processing of functional intermetallic and alloy materials is unprecedented.

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