New superconductor SrPt2Ge2 with Tc = 10.2 K

H. C. Ku, I. A. Chen, C. H. Huang, C. W. Chen, Y. B. You, M. F. Tai, Y. Y. Hsu

Research output: Contribution to journalArticle

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Abstract

Contrast to superconducting compounds SrNi2Ge2 (Tc = 1.1 K) and SrPd2Ge2 (Tc= 3.2 K) with the BaFe2-As2-type body-center-tetragonal (122-bct) layer structure (space group I4/mmm), SrPt2Ge2 crystallized in a pseudo-tetragonal, monoclinic structure with space group P21 and lattice parameters a = 0.4401(4) nm< b = 0.4435(4) nm, c = 0.9764(10) nm and β = 90.5° >90°. Superconductivity with Tc=10.2K was observed in this new compound. However, a weak diamagnetic shielding signal of -3.2 × 10 2 cm3/mol at 2K indicates that superconductivity is not from the bulk monoclinic phase but from a minor metastable 122-bct high-temperature phase with a ∼ 0.44 nm, c ∼ 0.98 nm, β = 90°. This is the highest Tc reported outside the iron-based layer compounds with the 122-bct structure. High-Tc superconductivity is due to strong quasi-2D Pt-Ge-Pt 5d xz, yz-4p-5dxz, yz hybridization in the Pt-Ge layer with squeezed PtGe4 tetrahedral crystal field and Pt-5d8 spin-orbital interaction in the metastable 122-bct phase and is another example of multi-band (dxz/dyz/dxy) non-conventional s-wave superconductor.

Original languageEnglish
Pages (from-to)93-95
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume493
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Superconductivity
Superconducting materials
superconductivity
Shielding
Lattice constants
crystal field theory
shielding
lattice parameters
Iron
iron
orbitals
Crystals
interactions
Temperature

Keywords

  • 122-bct layer crystal structure
  • Germanide
  • New superconductors

ASJC Scopus subject areas

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

Cite this

New superconductor SrPt2Ge2 with Tc = 10.2 K. / Ku, H. C.; Chen, I. A.; Huang, C. H.; Chen, C. W.; You, Y. B.; Tai, M. F.; Hsu, Y. Y.

In: Physica C: Superconductivity and its applications, Vol. 493, 01.01.2013, p. 93-95.

Research output: Contribution to journalArticle

Ku, H. C. ; Chen, I. A. ; Huang, C. H. ; Chen, C. W. ; You, Y. B. ; Tai, M. F. ; Hsu, Y. Y. / New superconductor SrPt2Ge2 with Tc = 10.2 K. In: Physica C: Superconductivity and its applications. 2013 ; Vol. 493. pp. 93-95.
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AU - You, Y. B.

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AB - Contrast to superconducting compounds SrNi2Ge2 (Tc = 1.1 K) and SrPd2Ge2 (Tc= 3.2 K) with the BaFe2-As2-type body-center-tetragonal (122-bct) layer structure (space group I4/mmm), SrPt2Ge2 crystallized in a pseudo-tetragonal, monoclinic structure with space group P21 and lattice parameters a = 0.4401(4) nm< b = 0.4435(4) nm, c = 0.9764(10) nm and β = 90.5° >90°. Superconductivity with Tc=10.2K was observed in this new compound. However, a weak diamagnetic shielding signal of -3.2 × 10 2 cm3/mol at 2K indicates that superconductivity is not from the bulk monoclinic phase but from a minor metastable 122-bct high-temperature phase with a ∼ 0.44 nm, c ∼ 0.98 nm, β = 90°. This is the highest Tc reported outside the iron-based layer compounds with the 122-bct structure. High-Tc superconductivity is due to strong quasi-2D Pt-Ge-Pt 5d xz, yz-4p-5dxz, yz hybridization in the Pt-Ge layer with squeezed PtGe4 tetrahedral crystal field and Pt-5d8 spin-orbital interaction in the metastable 122-bct phase and is another example of multi-band (dxz/dyz/dxy) non-conventional s-wave superconductor.

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