Superconductivity in the Metal Rich Li-Pd-B Ternary Boride

Abstract

Superconductivity at about 8 K was observed in the metal-rich Li-Pd-B ternary system. Structural, microstructural, electrical, and magnetic investigations for various compositions proved that the Li2Pd3B compound, which has an antiperovskite cubic structure composed of distorted Pd6B octahedrons, is responsible for the superconductivity. This is the first observation of superconductivity in metal-rich ternary borides containing alkaline metal and Pd as a late transition metal. The compound prepared by arc melting has a high density and is relatively stable in the air. The upper critical fields H(c2)(0) estimated by linear extrapolation and the Werthamer-Helfand-Hohenberg theory are 6.2 and 4.8 T, respectively.

Superconducting Fiber with Transition Temperature up to 7.43 K in Nb2PdxS5−δ (0.6 < x <1)

“…For practical uses, it is very important that a superconducting material is flexible. [4][5][6][7][8][9][10][11] Despite of the relatively lower superconducting transition temperature (less than 10 K), their discovery attracts much attention due to their potential application perspectives and scientific importance. Here we report the growth and the characterization of Nb 2 Pd x S 5- (0.6<x<1) superconducting fibers by using traditional flux-melting method.…”

Discovery of Li2(Pd,Pt)3B superconductors

“…Samples of Li-Pd-B (denoted LPB) were prepared by arc melting [1] in Ar atmosphere (1atm). We applied a two-step melting procedure.…”

“…Superconductivity was recently found in Li 2 (Pd 1-x ,Pt x ) 3 B solid solution [1][2][3], and it was observed in the entire x=0-1 range.…”

Non-Centrosymmetric Superconductors with Topological Transition of Fermi Surfaces

“…The NMR Knight shift of Li 2 Pd 3 B is decreased across the superconducting transition temperature T c , while that of Li 2 Pt 3 B is mostly unaffected in the superconducting state [4,5]. Thus, the superconducting properties are different between these two compounds in spite of having the same crystal symmetry [2][3][4][5][6][7].…”

“…Among many non-centrosymmetric superconductors, the perovskite-like cubic compounds Li 2 Pd 3 B [2] and Li 2 Pt 3 B [3] show particularly intriguing properties. The NMR Knight shift of Li 2 Pd 3 B is decreased across the superconducting transition temperature T c , while that of Li 2 Pt 3 B is mostly unaffected in the superconducting state [4,5].…”