Fragile structural transition in Mo3Sb7

J. Q. Yan, M. A. McGuire, A. F. May, D. Parker, D. G. Mandrus, B. C. Sales

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Abstract

Mo3Sb7 single crystals lightly doped with Cr, Ru, or Te are studied in order to explore the interplay between superconductivity, magnetism, and the cubic-tetragonal structural transition. The structural transition at 53 K is extremely sensitive to Ru or Te substitution which introduces additional electrons, but robust against Cr substitution. No sign of a structural transition was observed in superconducting Mo2.91Ru0.09Sb7 and Mo3Sb6.975Te0.025. In contrast, 3 at.% Cr doping only slightly suppresses the structural transition to 48 K while leaving no trace of superconductivity above 1.8 K. Analysis of magnetic properties suggests that the interdimer interaction in Mo3Sb7 is near a critical value and essential for the structural transition. All dopants suppress the superconductivity of Mo3Sb7. The tetragonal structure is not necessary for superconductivity.

Original languageEnglish
Article number064507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number6
DOIs
StatePublished - Aug 10 2015

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