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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.20: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Candidate for a quantum Griffiths phase in the itinerant ferromagnet Sr_1−xCa_xRuO₃ — Dirk Fuchs¹, •Chien-Lung Huang^1,2, Markus Wissinger¹, Rudolf Schneider¹, Jörg Schmalian³, and Hilbert von Löhneysen^1,2 — ¹Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — ²Karlsruher Institut für Technologie, Physikalisches Institut, 76031 Karlsruhe, Germany — ³Karlsruher Institut für Technologie, Institut für Theorie der Kondensierten Materie, 76031 Karlsruhe, Germany

The magnetization M, susceptibility χ, and the specific heat C of polycrystalline Sr_1−xCa_xRuO₃ was investigated as a function of the Ca substitution x. For x = 0 a second-order like ferromagnetic (FM) phase transition occurs at T_C = 162 K. T_C decreases with increasing x. Above the critical concentration x_c ∼ 0.7, i.e., x ≥ x_c, the FM order is completely suppressed. For x > 0 the susceptibility χ(T) deviates from a Curie-Weiss law below T_C of SrRuO₃ which indicates a Griffiths phase (GP) behavior. χ, M, and C are analyzed in detail with respect to the Griffith exponent λ and the GP regime within the phase diagram of Sr_1−xCa_xRuO₃.