High pressure synthesis of the mixed valent and nonsuperconducting ternary YbRhxSny compound |
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Authors: | A Jayaraman JP Remeika GP Espinosa AS Cooper H Barz RG Maines Z Fisk |
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Institution: | Bell Laboratories, Murray Hill, NJ 07974, USA;Department of Physics, University of California, San Diego La Jolla, CA 92093, USA |
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Abstract: | The ternary compound YbRh1.4Sn4.6 with the phase I structure (simple cubic) when subjected to a pressure of 40 kbar at 800°C is found to transform to phase III structure (f.c.c.) with the composition YbRh1.1Sn3. The latter compound has a lattice parameter of which suggests that the Yb is in an intermediate valence state. The temperature dependence of magnetic susceptibility suggests that the Yb is in a homogeneously mixed valence state in the pressure synthesized product. In the phase I structure YbRh1.1Sn4.6 is superconducting at 8.6°K, but in the phase III structure the compound YbRh1.1Sn3 is not superconducting down to 0.9°K. It is suggested that superconductivity and mixed valence are incompatible. |
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