Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 62: Superconductivity: Properties, Electronic Structure, Order Parameter

TT 62.1: Vortrag

Donnerstag, 14. März 2013, 15:00–15:15, H19

Y₃Pt₄Ge₁₃: a superconductor with non-centrosymmetric crystal structure — •Roman Gumeniuk, Michael Nicklas, Lev Akselrud, Walter Schnelle, Ulrich Schwarz, Alexander Tsirlin, Ulrich Burkhardt, Yuri Grin, and Andreas Leithe-Jasper — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

The intermetallic compound Y₃Pt₄Ge₁₃ has been synthesized by high-pressure and high-temperature technique (p = 8 GPa, T = 1070 K). It crystalizes with non-centrosymmetric type-of-structure in the monoclinic space group Cc (a = 12.8781(2) Å, b = 12.8384(2) Å, c = 9.1080(1) Å, β = 90.042(2) ^o, V = 1505.9(1) Å³) and is stable in the temperature range 4 K - 380 K. At 383 K structural phase transition for Y₃Pt₄Ge₁₃ was observed. Above the transition temperature, the crystal structure becomes rhombohedral (space group R3c, a = 12.7423(1) Å, c = 15.6888(1) Å, V = 2206.0(1) Å³). The low-temperature monoclinic modification of Y₃Pt₄Ge₁₃ becomes superconducting below T_c = 4.5 K. Thermodynamic properties as well as transport measurements were conducted down to 0.4 K. The upper critical field µ₀H_c2 is 3.8 T. The data are consistent with a single energy gap with s-wave symmetry for the superconducting phase.