The New Superconductor tP-SrPd2Bi2: Structural Polymorphism and Superconductivity in Intermetallics

2016/02/03 by Xie, Weiwei, Seibel, Elizabeth M., Cava, Robert J.
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1602.01364

Abstract

We consider a system where structural polymorphism suggests the possible existence of superconductivity through the implied structural instability. SrPd2Bi2 has two poly-morphs which can be controlled by the synthesis temperature: a tetragonal form (CaBe2Ge2-type) and a monoclinic form (BaAu2Sb2-type). Though the crystallographic difference between the two forms may at first seem trivial, we show that tetragonal SrPd2Bi2 is superconducting at 2.0 K whereas monoclinic SrPd2Bi2 is not. We rationalize this finding and place it in context with other 1-2-2 phases

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