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Superconducting LaRu2P2 and other alkaline earth and rare earth metal ruthenium and osmium phosphides and arsenides with ThCr2Si2 structure
Institution:1. Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, United States;2. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
Abstract:The ThCr2Si2-type compounds MRu2P2 (M = Ca, Sr, Ba, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), MOs2P2 (M = Sr, Ba, Eu), and MRu2As2 (M = Ca, Sr, Ba, La, Eu) were prepared by sintering techniques and/or by reaction of the elemental components in a tin flux. The crystal structures of SrRu2P2 and LaRu2P2 were refined from single-crystal diffractometer data to residuals of R = 0.019 (224 structure factors, 11 variable parameters) and R = 0.028 (510 F's, 11 variables), respectively. LaRu2P2 is diamagnetic and becomes superconducting at 4.1 K. No transition to a superconducting state was observed down to 1.8 K for the compounds MFe2P2 (M = Ca, Sr, Ba, La), MRu2P2 (M = Ca, Sr, Ba, Y), and MOs2P2 (M = Sr, Ba).
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