Si-induced superconductivity and structural transformations in DyRh4B4

Details Si-induced superconductivity and structural transformations in DyRh4B4 Si-induced superconductivity and structural transformations in DyRh4B4

2009-05-25

arxiv.org/abs/0905.4032v1

J. Alloys Compd. 482 (2009) 5

Physics

Condensed Matter

Superconductivity

11 pages, 6 figures, Accepted for publication in Journal of Alloys and Compounds

Scientific paper

10.1016/j.jallcom.2009.04.040

DyRh4B4 has been known to crystallize in the primitive tetragonal (pt)-structure and to exhibit a ferromagnetic transition at 12 K, the highest magnetic transition temperature in the entire series of the RRh4B4 materials [1]. We show here that our silicon-added samples of the nominal composition DyRh4B4Si0.2 exhibit superconductivity below Tc ~ 4.5 K and an antiferromagnetic transition below TN ~ 2.7 K. The 12 K transition observed in the pt-DyRh4B4 is completely suppressed. Our annealed samples mainly consist of domains of the chemical composition DyRh3.9B4.2Si0.08. These domains contain two crystallographic phases belonging to the body-centred tetragonal (bct)-structure and the orthorhombic (o)-structure. We have reasons to suggest that superconductivity and antiferromagnetic ordering arise from bct- DyRh4B4 phase and, therefore, coexist below TN ~ 2.7 K.

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