Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.15: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Critical scaling analysis of the itinerant ferromagnet Sr_1−xCa_xRuO₃ — •Dirk Fuchs, Markus Wissinger, Jörg Schmalian, Chien-Lung Huang, Rudolf Schneider, and Hilbert von Löhneysen — Karlsruhe Institute of Technology, Karlsruhe, Germany

The critical behavior of Sr_1−xCa_xRuO₃ was investigated by a scaling analysis based on the Arrott-Noakes equation of state. The critical exponents β, γ, and δ of the magnetic critical behavior were extracted for samples with 0 ≤ x ≤ 0.6. The ferromagnetic system exhibits a smooth suppression of the Curie temperature T_C to zero at a critical concentration x_c ≈ 0.7. For x = 0, mean-field like exponents are observed. With increasing x the critical exponents β, γ, and δ change nearly linearly from β ≈ 0.5, γ ≈ 1 and δ ≈ 3 for x = 0 to β ≈ 1, γ ≈ 0.9 and δ ≈ 1.6 for x ≈ 0.6. Despite the systematic evolution of the critical exponents as a function of x the exponents can not be described by a universality class of known classical standard models.