Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 67: Correlated Electrons: f-Electron Systems

TT 67.5: Vortrag

Mittwoch, 18. März 2015, 16:00–16:15, H 3005

Magnetic and transport properties of structural variants of Remeika phases: Th₃Ir₄Ge₁₃ and U₃Ir₄Ge₁₃ — •Roman Gumeniuk^1,2, Walter Schnelle¹, Andreas Leithe-Jasper¹, and Yuri Grin¹ — ¹Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany — ²Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Str. 23, 09596 Freiberg, Germany

Th₃Ir₄Ge₁₃ and U₃Ir₄Ge₁₃ crystallize with primitive cubic Tm₃Co₄Ge₁₃ and non-centrosymmetric rhombohedral HT-Y₃Pt₄Ge₁₃ type of structures, respectively, which are derivatives of the cubic Yb₃Rh₄Sn₁₃ prototype. Measurements of magnetic susceptibility, electrical resistivity, specific heat, thermopower, and thermal conductivity reveal, that Th₃Ir₄Ge₁₃ is a diamagnetic bad metal and undergoes a first-order phase transition at ≈ 200 K. Charge-density wave (CDW) and structural phase-transition scenarios for Th₃Ir₄Ge₁₃ are discussed. U₃Ir₄Ge₁₃ is Curie-paramagnetic (µ_eff = 4.05 µ_B) and orders ferromagnetically at T_C = 15 K. The U 5f electrons in U₃Ir₄Ge₁₃ are predominantly of itinerant nature.