Coexistence of Superconductivity and Charge Density Wave in SrPt2As2

TL;DR

This paper reports the discovery of SrPt2As2, a superconductor that also exhibits charge density wave order, highlighting its coexistence and suggesting similarities to iron-based superconductors.

Contribution

It introduces SrPt2As2 as a new arsenide superconductor with coexisting charge density wave and superconductivity, expanding understanding of such phenomena in nonmagnetic materials.

Findings

SrPt2As2 exhibits CDW at ~470 K.

Superconductivity occurs at Tc = 5.2 K.

Coexistence suggests Peierls instability with electron-phonon interaction.

Abstract

SrPt2As2 is a novel arsenide superconductor, which crystallizes in the CaBe2Ge2-type structure as a different polymorphic form of the ThCr2Si2-type structure. SrPt2As2 exhibits a charge-density-wave (CDW) ordering at about 470 K and enters into a superconducting state at Tc = 5.2 K. The coexistence of superconductivity and CDW refers to Peierls instability with a moderately strong electron-phonon interaction. Thus SrPt2As2 can be viewed as a nonmagnetic analog of iron-based superconductors, such as doped BaFe2As2, in which superconductivity emerges in close proximity to spin-density-wave ordering.