The European Physical Journal Special Topics

, Volume 224, Issue 6, pp 1061–1086 | Cite as

Heavy fermions, metal-to-insulator transition, and quantum criticality in La y Cu3Ru x Ti4−x O12

  • S. Riegg
  • S. Widmann
  • A. Günther
  • B. Meir
  • S. Wehrmeister
  • S. Sterz
  • W. Kraetschmer
  • S.G. Ebbinghaus
  • A. Reller
  • N. Büttgen
  • H.-A. Krug von Nidda
  • A. Loidl
Part of the following topical collections:
  1. Quantum Phase Transitions in Correlated Electron Systems


In this work we investigate the solid-solution series La y Cu3Ru x Ti4−x O12. The titanate La2/3Cu3Ti4O12 (x = 0) is an antiferromagnetic insulator exhibiting colossal dielectric constants, while the ruthenate LaCu3Ru4O12 (x = 4) is known as a rare d-electron derived heavy-fermion compound. Detailed structural investigations, AC- and DC-magnetization measurements, resistivity, specific-heat, and magnetic-resonance investigations have been performed for all polycrystalline compounds prepared by solid-state synthesis. These experiments have been accompanied by band-structure calculations. Close to the Ru concentration x = 2 we identify a quantum-critical point coinciding with a metal-to-insulator transition. The quantum-critical point separates an insulating spin glass from a paramagnetic metal. Interestingly, there is no evidence for a divergence of the effective mass upon reaching the quantum-critical point from the metallic side. In the paramagnetic metal, Ru behaves like a canonical Kondo ion. While the Ru oxidation state remains stable at + 4 for the whole concentration regime, the Cu valence seems to decrease from + 2 in the insulating antiferromagnet with localized copper spins to a significantly lower value in the metallic heavy-fermion compounds.


Electron Spin Resonance European Physical Journal Special Topic Quantum Phase Transition CaCu Spin Moment 
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

  • S. Riegg
    • 1
  • S. Widmann
    • 1
  • A. Günther
    • 1
  • B. Meir
    • 1
  • S. Wehrmeister
    • 1
  • S. Sterz
    • 1
  • W. Kraetschmer
    • 1
  • S.G. Ebbinghaus
    • 2
  • A. Reller
    • 3
  • N. Büttgen
    • 1
  • H.-A. Krug von Nidda
    • 1
  • A. Loidl
    • 1
  1. 1.Experimental Physics V, Center for Electronic Correlations and Magnetism, University of AugsburgAugsburgGermany
  2. 2.Solid State Chemistry, Martin-Luther-University Halle-WittenbergHalleGermany
  3. 3.Resource Strategy, University of AugsburgAugsburgGermany

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