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The European Physical Journal Special Topics

, Volume 224, Issue 6, pp 1105–1126 | Cite as

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

  • D. Fuchs
  • C.L. Huang
  • J. Schmalian
  • M. Wissinger
  • S. Schuppler
  • K. Grube
  • H. v. Löhneysen
Review
Part of the following topical collections:
  1. Quantum Phase Transitions in Correlated Electron Systems

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.

Keywords

European Physical Journal Special Topic Critical Exponent Quantum Phase Transition Quantum Critical Point Tetragonal Distortion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2015

Authors and Affiliations

  • D. Fuchs
    • 1
  • C.L. Huang
    • 1
    • 2
  • J. Schmalian
    • 1
    • 3
  • M. Wissinger
    • 1
  • S. Schuppler
    • 1
  • K. Grube
    • 1
  • H. v. Löhneysen
    • 1
    • 2
  1. 1.Institut für Festkörperphysik, Karlsruher Institut für TechnologieKarlsruheGermany
  2. 2.Physikalisches Institut, Karlsruher Institut für TechnologieKarlsruheGermany
  3. 3.Institut für Theorie der Kondensierten Materie, Karlsruher Institut für TechnologieKarlsruheGermany

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