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Competing ground states in transition metal oxides: Behavior of itinerant Sr1−x Ca x RuO3 close to the classical and quantum critical ferromagnetic phase transition

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Abstract

The ferromagnetic (FM) phase transition of the itinerant electron-system Sr1−x Ca x RuO3 can be tuned by chemical composition resulting in a quantum critical point (QCP) at the critical concentration x c ≈ 0.7. Applying epitaxial pressure at constant x leads to a reduction of the Curie temperature T C which is found to be proportional to the shrinkage of the unit-cell volume V uc , shifting x c to higher values for tensile strained films. Surprisingly, the tetragonal distortion seems to play here only a minor role. With increasing x the critical scaling of the order parameter shows unusual behavior. The magnetic critical exponents β, γ, and δ change systematically from typical mean-field values at x = 0 with increasing x towards β = 1, γ = 0.9 and δ = 1.6 at x = 0.7. The results are discussed with respect to a crossover from mean-field-like behavior at x = 0 to a line of fixed points that might emerge in the strong-disorder limit as the system approaches the QCP at or near x c . Magnetic inhomogeneities are indeed suggested by a non-vanishing magnetic moment at x c and the evidence of a Griffiths phase as well as glass-like behavior close to x c . Although spin fluctuations certainly play an important role around x c as proposed previously, our highly accurate data of the magnetization M(T,B) and specific heat C(T,B) for x = 0.7 suggest dynamic scaling with an unusual dynamic exponent z = 1.8, incompatible with standard spin-fluctuation theories at a ferromagnetic QCP.

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Authors and Affiliations

  1. Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021, Karlsruhe, Germany

    D. Fuchs, C.L. Huang, J. Schmalian, M. Wissinger, S. Schuppler, K. Grube & H. v. Löhneysen

  2. Physikalisches Institut, Karlsruher Institut für Technologie, 76031, Karlsruhe, Germany

    C.L. Huang & H. v. Löhneysen

  3. Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie, 76031, Karlsruhe, Germany

    J. Schmalian

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  1. D. Fuchs
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Fuchs, D., Huang, C., Schmalian, J. et al. Competing ground states in transition metal oxides: Behavior of itinerant Sr1−x Ca x RuO3 close to the classical and quantum critical ferromagnetic phase transition. Eur. Phys. J. Spec. Top. 224, 1105–1126 (2015). https://doi.org/10.1140/epjst/e2015-02448-1

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