Pressure effect and superconducting properties of lithium ternary borides

Hiroyuki Takeya, Mohammed El Massalami, Kazuto Hirata, Takashi Mochiku, Shigeru Kasahara, Kazumasa Togano

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Li2Pd3B and Li2Pt3B show superconducting transition at the temperatures, 7.4 K and 2.6 K, respectively. These materials have the same cubic structure (P4332) composed of distorted octahedrons, whose corners are occupied by Pd/Pt. This structure does not have mirror or inversion symmetry along any directions. It is a very interesting feature of those materials in relation to the symmetry of superconductivity. The samples were prepared by a two-stage arc-melting method. Their superconductivity is induced by Li addition. Controlling the Li stoichiometry is a key to synthesize high quality samples in the preparation process of arc-melting because Li is volatile at high temperatures. The specific heat measurements were carried out by heat-pulse relaxation and semi-adiabatic methods. Pressure effect was measured with a SQUID magnetometer using a low temperature hydrostatic micropressure cell at pressures up to around 1 GPa. The superconducting transition temperatures of both Li2Pd3B and Li2Pt3B decreased linearly with pressure. The pressure dependence, dTc/dP, were 0.091 and 0.090 K/GPa, respectively.

Original languageEnglish
Pages (from-to)89-90
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume460-462 I
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Sep 1 2007
Externally publishedYes

Keywords

  • Heat capacity
  • LiPdB
  • LiPtB
  • Pressure effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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