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

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