Physical properties of Li2Pd3B and Li 2Pt3B superconductors

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Superconductivity in two Li-containing compounds of Li2Pd 3B and Li2Pt3B was recently discovered. These materials, showing the superconducting transition at 7.2 K and 2.6 K, respectively, have the same cubic structure (P4332) composed of distorted octahedrons without mirror or inversion symmetry along any directions. This is a very interesting feature of those materials in relation to the symmetry of superconductivity. Resistivity measurements in magnetic fields gave their upper critical fields, Hc2(0) = 45 kOe and 19 kOe, respectively. Their specific heat was measured using a heat-pulse relaxation method. The Sommerfeld coefficient (γ) and Debye temperature (θD) terms of Li2Pd3B were given as γ=9.5 mJmol-1K-2 and θD=228 K. The value of C/γr at Tc was calculated to be 1.7. In the same manner, those parameters were described for Li2Pt3B as γ=9.6 mJmol-1K-2, θD=240 K, and C/γTc =0.75, respectively. Since C/γTC in the weak-coupling limit by the BCS theory is 1.43, the value of 1.7 for Li 2Pd3B is slightly higher. The electronic specific heat of Li2Pd3B at a zero magnetic field follows the typical exponetial behavior discribed in the BCS theory, while that of Li 2Pt3B shows quadratic behavior. This result suggests the line nodes exist in the superconducting gap of Li2Pt3B driven by the spin-orbit interaction.

Original languageEnglish
Title of host publicationSelected, peer reviewed papers from The Sixth Pacific Rim International Conference on Advanced Materials and Processing, PRICM 6
PublisherTrans Tech Publications Ltd
Pages2079-2082
Number of pages4
EditionPART 3
ISBN (Print)0878494626, 9780878494620
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event6th Pacific Rim International Conference on Advanced Materials and Processing, PRICM 6 - Jeju, Korea, Republic of
Duration: Nov 5 2007Nov 9 2007

Publication series

NameMaterials Science Forum
NumberPART 3
Volume561-565
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference6th Pacific Rim International Conference on Advanced Materials and Processing, PRICM 6
Country/TerritoryKorea, Republic of
CityJeju
Period11/5/0711/9/07

Keywords

  • Li PtB
  • LiPdB
  • Lithium borides
  • Resistivity
  • Specific heat
  • Superconductor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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