High-Temperature Superconductors, the First Ternary System

Matthias, B. T.; Marezio, M.; Corenzwit, E.; Cooper, A. S.; Barz, H.

doi:10.1126/science.175.4029.1465

Cited by 230 publications

(52 citation statements)

References 4 publications

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“…In fact, it is also one of the few true ternary systems of high-temperature superconductors. Two other examples are the double molybdenum sulfides (14) and the rare earth rhodium borides (15).…”

Section: Resultsmentioning

confidence: 99%

Ternary transition metal phosphides: High-temperature superconductors

Barz¹,

Meisner

et al. 1980

Proc. Natl. Acad. Sci. U.S.A.

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Two systems of ternary transition metal phosphides with the ordered Fe2P-type hexagonal structure are reported. They have the general formula MRuP and MOsP, in which M can be Ti, Zr, or Hf. An onset of the superconducting transition temperature as high as 13.0 K is reported for the ZrRuP compound.Many ternary transition metal phosphides with the general formula MM'P and the ordered Fe2P-type hexagonal structure (C22) (1) are known: TiMnP, MnNiP, FeNiP, CoNiP, MoNiP, WNiP, MnRuP, CrRhP, MnRhP, CrPdP, and CaAgP (2-7). M6ssbauer studies and x-ray intensity measurements show that in general M and M' are metal elements with M occupying the 3(g) positions of the space group P62m, and M' occupying the 3(f) positions. As a rule, M is to the left of M' in the periodic table. In the case that M and M' have similar atomic sizes, there is a possibility that a slight disorder may occur. For example, in the FeNiP compounds, 25-30% of the 3(g) positions are occupied by Ni. The crystallographic ordering is reported to be very sensitive to the heat treatment of the samples, and it is possible that the ordering may effect the magnetic properties of the compounds (6,(8)(9)(10).With the presence of the 3d transition metals Cr, Mn, Fe, Co, or Ni, most of the compounds reported were ordered ferromagnetically, and no superconductivity was reported in this particular group of ternary transition metal phosphides.During the study of the Zr-Ru-P ternary system, many samples had been found to become superconducting above 10 K. Because there are no superconducting transition temperatures (TCs) reported above 6 K in the related binary systems (11), and because most ternary phosphide phases are reported with the 1-1-1 composition,* ZrRuP was made; it was found to form the ordered Fe2P-type structure, with an onset of superconductivity as high as 13.0 K. EXPERIMENTAL DETAILS All samples were prepared from transition metals with purities of 99.9% and red phosphorus with a purity of better than 99.999%. Mixtures of the powders were pressed into small pellets and sintered between 800 and 1200°C in sealed quartz tubes under an argon atmosphere. Some samples were synthesized by making the binary RuP and OsP compounds first. After the measurements, all sintered compounds were arcmelted under an argon atmosphere in a Zr-gettered arc furnace and then annealed between 800 and 1200°C.Powder x-ray diffraction data were taken on a GE XTD-6The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertlsement" in accordance with 18 U. S. C. §1734 solely to indicate this fact. 3132 diffractometer (CuKa radiation), equipped with a diffractedbeam crystal monochrometer, at a scanning rate of 0.20 in 20 per minute. Line intensities were determined by weighing paper tracings of the diffracted peaks, and the program "Lazy Pulverix" was used to calculate the line intensities (12). Superconducting transition temperatures were obtained from low frequency (20-Hz) ac magnetic susceptib...

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Section: Resultsmentioning

confidence: 99%

Ternary transition metal phosphides: High-temperature superconductors

Barz¹,

Meisner

et al. 1980

Proc. Natl. Acad. Sci. U.S.A.

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“…1 Until now, high-T c superconductivity in nonconventional copper-free systems has been reported in only a handful of compounds. Among these, the chalcogenide ''Chevrel'' phases for which PbMo 2 S 4 has the highest T c , 2 the spinel LiTi 2 O 4 , 3 the substituted BaBiO 3 perovskite, 4,5 and the intercalated C 60 , 6 are probably the most widely known. In order to investigate whether superconductivity can occur in other noncopper-based systems having half-filled e g level d bands, we have studied compounds of the Bi 2 M 3 Co 2 O y (yϭ9) type.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of metallic behavior in bismuth cobaltates through lead doping

et al. 2001

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Single crystals of Bi 2 M 3 Co 2 O y phases with M ϭCa, Sr, and Ba were synthesized by the flux method. The undoped Ca and Sr analogs are semiconducting while the Ba analog has a metal to semiconductor transition at Ϸ80 K. Pb-substituted single crystals in which Pb partially substitutes for Bi were prepared by a similar method. Transmission electron microscopy carried out on single crystals of the undoped phases reveals a superstructure similar to that of superconducting bismuth-2212. This superstructure disappears when the Sr and Ba compounds are Pb doped. Transport measurements show that Pb doping induces a clear increase in the metallic character of the samples for Sr and Ba analogs. The metal to semiconductor transition in Bi 2 Ba 3 Co 2 O y is suppressed by Pb doping, and ͑Bi, Pb͒ 2 Ba 3 Co 2 O y is metallic down to 30 mK. The magnetic-susceptibility data do not show any evidence of ordering, and the magnetic moment Co atom was found to be Ϸ1 B . Resistivity measurements carried out up to 20 GPa show that the samples become more semiconducting with increasing pressure.

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“…They are known to exist in molybdenum(II) halides [2], as well as the ternary molybdenum chalcogenides known as Chevrel phases, M^MogYg (M = ternary metal cation; Y = chalcogenide) [3,4]. Many Chevrel phase compounds have been found to be superconductors [5], show catalytic activity [6], and finally, are ionic conductors [7], thus raising considerable interest in these compounds.…”

Section: Statement Of the Problemmentioning

confidence: 99%

Synthesis, characterization, and reactivity of sulfided hexanuclear molybdenum cluster compounds

Spink

1990

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High-Temperature Superconductors, the First Ternary System

Cited by 230 publications

References 4 publications

Ternary transition metal phosphides: High-temperature superconductors

Ternary transition metal phosphides: High-temperature superconductors

Enhancement of metallic behavior in bismuth cobaltates through lead doping

Synthesis, characterization, and reactivity of sulfided hexanuclear molybdenum cluster compounds

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