H. Barz

Superconductivity of Double Chalcogenides: Lix Ti1.1S2.

Lithium titanium sulfides, LixTi1.1S2(0.1 x ≤ 0.3), become superconducting over the temperature range from 10� to 13�K. They have the hexagonal Ti3S4 structure and should not be considered intercalation compounds. This is the first class of noncubic compounds with high transition temperatures.

New ternary superconductors with silicon

Abstract A new superconducting ternary system with the formula MRu3Si2+x, where x ∼ +.2 is reported. M is Y, La and Th. The superconducting transition temperatures range from 7.6 K for La to 3.5 K for Y.

Superconductivity of some binary and ternary transition-metal borides

Abstract Superconducting transition temperatures of some binary transition-metal borides and a new series of ternary transition-metal borides are reported. The variation of T C vs electron/atom ratio and the crystal chemical behavior of the borides in relation to their superconducting behavior are discussed.

Variation of superconducting transition temperatures of transition‐metal thin films deposited with the noble gases

Thin films of Cr, Mo, Ti, W, and Zr metals deposited by dc ion‐beam sputtering in noble‐gas atmospheres were found to be superconducting with transition temperatures substantially higher than those observed for the respective bulk metals. Mo films deposited with a Xe ion beam were found to be superconducting at a temperature of 7.2°K. A variation of Tc was observed for films deposited using different noble gases with highest transition temperatures obtained for deposition with Xe gas. Ion‐beam‐sputtered thin films of Nb, Ru, Ta, and V metals were similarly deposited with a resulting decrease in Tc as compared with their bulk metals. Film deposition with noble gases of higher mass produced higher Tcs than those obtained with lower‐mass noble gases. The mechanism responsible for the variation of the superconducting transition temperatures of these metal films is not known at this time but may be associated with the formation of a dilute solution/mixture of the noble gas and the transition metal, a change i...

Superconductivity, magnetism and metastability of new ternary iridium borides

Abstract Superconductivity has been found in the rare earth iridium borides with the general formula MIr 4 B 4 and in the pseudoternary (Y x Lu 1−x )−Ir 4 B 4 system, M being a rare earth element. The pure phase in itself is only metastable at best. The compounds were found to crystallize with the primitive tetragonal CeCo 4 B 4 -type structure. The close correlation between superconductivity, magnetism and structural metastability is demonstrated with the study of the pseudoternary systems M(Ir x Rh 1−x ) 4 B 4 ( x = 0.1 and 0.5) and Er(Ir x Rh 1−x ) 4 B 4 .

ScRu4B4: A new superconducting member of the MRu4B4 ternary system

Abstract The occurrence of superconductivity with the onset of 7.2 K is reported for the metastable compound ScRu 4 B 4 , a new member of the body-centered-tetragonal MRu 4 B 4 system. Superconducting and crystallographic data for a series of pseudoternary (Lu 1−x Sc x )Ru 4 B 4 alloys are also presented and discussed.

Isomorphs of the superconducting/magnetic ternary stannides

Abstract Single crystals of some new ternary stannides in the systems (M)CoSn, (M)RuSn and (M)OsSn, where M = rare earth, Y. Sc, Ca, Sr, or Th have been grown from a tin solvent in vacuo. We find the new compounds to be isomorphous to the published rare earth rhodium tin compounds. The ternary, TmOs x Sn y , has been found to be a reentrant superconductor with T c = 1.1K and T m = 0.6K. Superconducting and/or magnetic transition temperatures and lattice parameters are given. A tabular summary of identified phases and their lattice constants for all the ternary stannides prepared so far is included for comparative purposes.

The crystal structure of a new ternary silicide in the system rare-earth-ruthenium-silicon

Abstract The structural properties of a new group of ternary silicides in the system M-Ru-Si (M = Y, La, Th and RE) have been investigated. The structure is presented as determined from X-ray powder diffraction.

Crystal chemistry, growth and reentrant behavior of additional superconducting/magnetic stannides

Single crystals of compounds in the systems (M)-Os-Sn, (M)-Os-Pt-Sn, (M)-Pt-Sn; (M)-Ru-Sn, (M)-Ru-Pd-Sn and (M)-Pd-Sn, with M = Er, Y, La, Ca or Yb, have been grown from a tin solvent in vacuo. The compound ErOsxSny has been found to be a reentrant superconductor with Tc ⋍ 1.25 K and Tm ⋍ 0.45 K. Lattice parameters, superconducting and magnetic transition temperatures, and chemical analyses are given.

Enhancement of Superconductivity through Lattice Softening

The superconducting transition temperature of an iridium-yttrium eutectic is enhanced extraordinarily through lattice softening. This is shown by a drastically reduced Debye temperature.