Superconductivity in a low carrier density system: A single crystal study of cubic Y₃Ru₄Ge₁₃

الأصل · EN

We have successfully grown the single crystal of a low carrier density system Y₃Ru₄Ge₁₃ which crystallizes in the cubic crystal structure with the space group Pm3n. Y₃Ru₄Ge₁₃ exhibits super conductivity below 2.85 K as determined from the electrical resistivity, magnetic susceptibility and heat capacity measurements. The bulk measurements indicate multiband superconductivity in this low carrier system. Hall effect measurements show that the Hall coefficient Rₕ is positive and it decreases rapidly with temperature which is highly unusual. The simple estimation of the carrier concentration gives a value (10²⁰/cm³) which is 2-3 orders of magnitude lower than that of a conventional metal like Cu which seems to suggest that Y₃Ru₄Ge₁₃ is a semimetal that display multiband superconductivity.